bme280 driver in Lua+C
This commit is contained in:
Lukáš Voborský
Nathaniel Wesley Filardo
parent
54e8696ac9
commit
b9091784ae
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@ -16,6 +16,7 @@
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//#define LUA_USE_MODULES_BLOOM
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//#define LUA_USE_MODULES_BMP085
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//#define LUA_USE_MODULES_BME280
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//#define LUA_USE_MODULES_BME280_MATH
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//#define LUA_USE_MODULES_BME680
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//#define LUA_USE_MODULES_COAP
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//#define LUA_USE_MODULES_COLOR_UTILS
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@ -236,6 +236,8 @@ static int bme280_lua_setup(lua_State* L) {
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uint8_t const bit3 = 0b111;
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uint8_t const bit2 = 0b11;
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platform_print_deprecation_note("bme280", "soon. Use bme280math and bme280 Lua module instead");
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bme280_mode = (!lua_isnumber(L, 4)?BME280_NORMAL_MODE:(luaL_checkinteger(L, 4)&bit2)) // 4-th parameter: power mode
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| ((!lua_isnumber(L, 2)?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 2)&bit3)) << 2) // 2-nd parameter: pressure oversampling
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| ((!lua_isnumber(L, 1)?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 1)&bit3)) << 5); // 1-st parameter: temperature oversampling
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@ -0,0 +1,357 @@
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// ***************************************************************************
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// BMP280 module for ESP8266 with nodeMCU
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//
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// Written by Lukas Voborsky, @voborsky
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//
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// MIT license, http://opensource.org/licenses/MIT
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// ***************************************************************************
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// #define NODE_DEBUG
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#include "module.h"
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#include "lauxlib.h"
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#include "platform.h"
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#include "user_interface.h"
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#include <math.h>
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/****************************************************/
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/**\name registers definition */
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/***************************************************/
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#define BME280_REGISTER_CONTROL (0xF4)
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#define BME280_REGISTER_CONTROL_HUM (0xF2)
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#define BME280_REGISTER_CONFIG (0xF5)
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#define BME280_REGISTER_CHIPID (0xD0)
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#define BME280_REGISTER_VERSION (0xD1)
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#define BME280_REGISTER_SOFTRESET (0xE0)
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#define BME280_REGISTER_CAL26 (0xE1)
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#define BME280_REGISTER_PRESS (0xF7) // 0xF7-0xF9
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#define BME280_REGISTER_TEMP (0xFA) // 0xFA-0xFC
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#define BME280_REGISTER_HUM (0xFD) // 0xFD-0xFE
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#define BME280_REGISTER_DIG_T (0x88) // 0x88-0x8D ( 6)
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#define BME280_REGISTER_DIG_P (0x8E) // 0x8E-0x9F (18)
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#define BME280_REGISTER_DIG_H1 (0xA1) // 0xA1 ( 1)
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#define BME280_REGISTER_DIG_H2 (0xE1) // 0xE1-0xE7 ( 7)
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/****************************************************/
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/**\name I2C ADDRESS DEFINITIONS */
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/***************************************************/
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#define BME280_I2C_ADDRESS1 (0x76)
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#define BME280_I2C_ADDRESS2 (0x77)
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/****************************************************/
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/**\name POWER MODE DEFINITIONS */
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/***************************************************/
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/* Sensor Specific constants */
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#define BME280_SLEEP_MODE (0x00)
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#define BME280_FORCED_MODE (0x01)
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#define BME280_NORMAL_MODE (0x03)
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#define BME280_SOFT_RESET_CODE (0xB6)
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/****************************************************/
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/**\name OVER SAMPLING DEFINITIONS */
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/***************************************************/
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#define BME280_OVERSAMP_1X (0x01)
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#define BME280_OVERSAMP_2X (0x02)
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#define BME280_OVERSAMP_4X (0x03)
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#define BME280_OVERSAMP_8X (0x04)
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#define BME280_OVERSAMP_16X (0x05)
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/****************************************************/
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/**\name STANDBY TIME DEFINITIONS */
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/***************************************************/
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#define BME280_STANDBY_TIME_1_MS (0x00)
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#define BME280_STANDBY_TIME_63_MS (0x01)
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#define BME280_STANDBY_TIME_125_MS (0x02)
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#define BME280_STANDBY_TIME_250_MS (0x03)
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#define BME280_STANDBY_TIME_500_MS (0x04)
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#define BME280_STANDBY_TIME_1000_MS (0x05)
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#define BME280_STANDBY_TIME_10_MS (0x06)
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#define BME280_STANDBY_TIME_20_MS (0x07)
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/****************************************************/
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/**\name FILTER DEFINITIONS */
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/***************************************************/
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#define BME280_FILTER_COEFF_OFF (0x00)
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#define BME280_FILTER_COEFF_2 (0x01)
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#define BME280_FILTER_COEFF_4 (0x02)
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#define BME280_FILTER_COEFF_8 (0x03)
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#define BME280_FILTER_COEFF_16 (0x04)
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/****************************************************/
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/**\data type definition */
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/***************************************************/
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#define BME280_S32_t int32_t
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#define BME280_U32_t uint32_t
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#define BME280_S64_t int64_t
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#define BME280_SAMPLING_DELAY 113 //maximum measurement time in ms for maximum oversampling for all measures = 1.25 + 2.3*16 + 2.3*16 + 0.575 + 2.3*16 + 0.575 ms
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// #define r16s(reg) ((int16_t)r16u(reg))
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// #define r16sLE(reg) ((int16_t)r16uLE(reg))
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// #define bme280_adc_P(void) r24u(BME280_REGISTER_PRESS)
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// #define bme280_adc_T(void) r24u(BME280_REGISTER_TEMP)
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// #define bme280_adc_H(void) r16u(BME280_REGISTER_HUM)
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typedef struct {
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uint16_t dig_T1;
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int16_t dig_T2;
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int16_t dig_T3;
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uint16_t dig_P1;
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int16_t dig_P2;
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int16_t dig_P3;
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int16_t dig_P4;
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int16_t dig_P5;
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int16_t dig_P6;
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int16_t dig_P7;
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int16_t dig_P8;
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int16_t dig_P9;
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uint8_t dig_H1;
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int16_t dig_H2;
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uint8_t dig_H3;
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int16_t dig_H4;
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int16_t dig_H5;
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int8_t dig_H6;
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} bme280_data_t;
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typedef bme280_data_t* bme280_data_p;
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bme280_data_p bme280_data;
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BME280_S32_t bme280_t_fine;
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// Returns temperature in DegC, resolution is 0.01 DegC. Output value of “5123” equals 51.23 DegC.
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// t_fine carries fine temperature as global value
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BME280_S32_t bme280_compensate_T(BME280_S32_t adc_T) {
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BME280_S32_t var1, var2, T;
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var1 = ((((adc_T>>3) - ((BME280_S32_t)(*bme280_data).dig_T1<<1))) * ((BME280_S32_t)(*bme280_data).dig_T2)) >> 11;
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var2 = (((((adc_T>>4) - ((BME280_S32_t)(*bme280_data).dig_T1)) * ((adc_T>>4) - ((BME280_S32_t)(*bme280_data).dig_T1))) >> 12) *
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((BME280_S32_t)(*bme280_data).dig_T3)) >> 14;
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bme280_t_fine = var1 + var2;
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T = (bme280_t_fine * 5 + 128) >> 8;
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return T;
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}
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// Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24 integer bits and 8 fractional bits).
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// Output value of “24674867” represents 24674867/256 = 96386.2 Pa = 963.862 hPa
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BME280_U32_t bme280_compensate_P(BME280_S32_t adc_P) {
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BME280_S64_t var1, var2, p;
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var1 = ((BME280_S64_t)bme280_t_fine) - 128000;
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var2 = var1 * var1 * (BME280_S64_t)(*bme280_data).dig_P6;
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var2 = var2 + ((var1*(BME280_S64_t)(*bme280_data).dig_P5)<<17);
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var2 = var2 + (((BME280_S64_t)(*bme280_data).dig_P4)<<35);
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var1 = ((var1 * var1 * (BME280_S64_t)(*bme280_data).dig_P3)>>8) + ((var1 * (BME280_S64_t)(*bme280_data).dig_P2)<<12);
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var1 = (((((BME280_S64_t)1)<<47)+var1))*((BME280_S64_t)(*bme280_data).dig_P1)>>33;
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if (var1 == 0) {
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return 0; // avoid exception caused by division by zero
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}
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p = 1048576-adc_P;
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p = (((p<<31)-var2)*3125)/var1;
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var1 = (((BME280_S64_t)(*bme280_data).dig_P9) * (p>>13) * (p>>13)) >> 25;
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var2 = (((BME280_S64_t)(*bme280_data).dig_P8) * p) >> 19;
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p = ((p + var1 + var2) >> 8) + (((BME280_S64_t)(*bme280_data).dig_P7)<<4);
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p = (p * 10) >> 8;
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return (BME280_U32_t)p;
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}
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// Returns humidity in %RH as unsigned 32 bit integer in Q22.10 format (22 integer and 10 fractional bits).
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// Output value of “47445” represents 47445/1024 = 46.333 %RH
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BME280_U32_t bme280_compensate_H(BME280_S32_t adc_H) {
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BME280_S32_t v_x1_u32r;
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v_x1_u32r = (bme280_t_fine - ((BME280_S32_t)76800));
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v_x1_u32r = (((((adc_H << 14) - (((BME280_S32_t)(*bme280_data).dig_H4) << 20) - (((BME280_S32_t)(*bme280_data).dig_H5) * v_x1_u32r)) +
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((BME280_S32_t)16384)) >> 15) * (((((((v_x1_u32r * ((BME280_S32_t)(*bme280_data).dig_H6)) >> 10) * (((v_x1_u32r *
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((BME280_S32_t)(*bme280_data).dig_H3)) >> 11) + ((BME280_S32_t)32768))) >> 10) + ((BME280_S32_t)2097152)) *
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((BME280_S32_t)(*bme280_data).dig_H2) + 8192) >> 14));
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v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((BME280_S32_t)(*bme280_data).dig_H1)) >> 4));
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v_x1_u32r = (v_x1_u32r < 0 ? 0 : v_x1_u32r);
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v_x1_u32r = (v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r);
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v_x1_u32r = v_x1_u32r>>12;
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return (BME280_U32_t)((v_x1_u32r * 1000)>>10);
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}
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double ln(double x) {
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double y = (x-1)/(x+1);
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double y2 = y*y;
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double r = 0;
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for (int8_t i=33; i>0; i-=2) { //we've got the power
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r = 1.0/(double)i + y2 * r;
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}
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return 2*y*r;
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}
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uint32_t bme280_h = 0; // buffer last qfe2qnh calculation
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double bme280_hc = 1.0;
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double bme280_qfe2qnh(double qfe, double h) {
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double hc;
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if (bme280_h == h) {
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hc = bme280_hc;
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} else {
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hc = pow((double)(1.0 - 2.25577e-5 * h), (double)(-5.25588));
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bme280_hc = hc; bme280_h = h;
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}
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double qnh = (double)qfe * hc;
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return qnh;
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}
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int bme280_lua_setup(lua_State* L) {
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uint8_t bme280_mode = 0; // stores oversampling settings
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uint8_t bme280_ossh = 0; // stores humidity oversampling settings
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uint8_t config;
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uint8_t const bit3 = 0b111;
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uint8_t const bit2 = 0b11;
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bme280_mode = (!lua_isnumber(L, 5)?BME280_NORMAL_MODE:(luaL_checkinteger(L, 5)&bit2)) // 4-th parameter: power mode
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| ((!lua_isnumber(L, 3)?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 3)&bit3)) << 2) // 2-nd parameter: pressure oversampling
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| ((!lua_isnumber(L, 2)?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 2)&bit3)) << 5); // 1-st parameter: temperature oversampling
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bme280_ossh = (!lua_isnumber(L, 4))?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 4)&bit3); // 3-rd parameter: humidity oversampling
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config = ((!lua_isnumber(L, 6)?BME280_STANDBY_TIME_20_MS:(luaL_checkinteger(L, 6)&bit3))<< 5) // 5-th parameter: inactive duration in normal mode
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| ((!lua_isnumber(L, 7)?BME280_FILTER_COEFF_16:(luaL_checkinteger(L, 7)&bit3)) << 2); // 6-th parameter: IIR filter
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// NODE_DBG("mode: %x\nhumidity oss: %x\nconfig: %x\n", bme280_mode, bme280_ossh, config);
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#define r16uLE_buf(reg) (uint16_t)((reg[1] << 8) | reg[0])
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#define r16sLE_buf(reg) (int16_t)(r16uLE_buf(reg))
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size_t reg_len;
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const char *buf = luaL_checklstring(L, 1, ®_len);
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bme280_data = (bme280_data_p) memset(lua_newuserdata(L, sizeof(*bme280_data)), 0, sizeof(*bme280_data)); // first parameter to be returned
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const uint8_t *reg;
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reg = buf;
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(*bme280_data).dig_T1 = r16uLE_buf(reg); reg+=2;
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(*bme280_data).dig_T2 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_T3 = r16sLE_buf(reg); reg+=2;
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// NODE_DBG("dig_T: %d\t%d\t%d\n", (*bme280_data).dig_T1, (*bme280_data).dig_T2, (*bme280_data).dig_T3);
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(*bme280_data).dig_P1 = r16uLE_buf(reg); reg+=2;
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(*bme280_data).dig_P2 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_P3 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_P4 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_P5 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_P6 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_P7 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_P8 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_P9 = r16sLE_buf(reg); reg+=2;
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// NODE_DBG("dig_P: %d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", (*bme280_data).dig_P1, (*bme280_data).dig_P2,(*bme280_data).dig_P3, (*bme280_data).dig_P4, (*bme280_data).dig_P5, (*bme280_data).dig_P6, (*bme280_data).dig_P7,(*bme280_data).dig_P8, (*bme280_data).dig_P9);
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if (reg_len>=6+18) { // is BME?
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(*bme280_data).dig_H1 = (uint8)reg[0]; reg+=1;
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(*bme280_data).dig_H2 = r16sLE_buf(reg); reg+=2;
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(*bme280_data).dig_H3 = reg[0]; reg++;
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(*bme280_data).dig_H4 = (int16_t)reg[0] << 4 | (reg[1] & 0x0F); reg+=1; // H4[11:4 3:0] = 0xE4[7:0] 0xE5[3:0] 12-bit signed
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(*bme280_data).dig_H5 = (int16_t)reg[1] << 4 | (reg[0] >> 4); reg+=2; // H5[11:4 3:0] = 0xE6[7:0] 0xE5[7:4] 12-bit signed
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(*bme280_data).dig_H6 = (int8_t)reg[0];
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NODE_DBG("dig_H: %d\t%d\t%d\t%d\t%d\t%d\n", (*bme280_data).dig_H1, (*bme280_data).dig_H2, (*bme280_data).dig_H3, (*bme280_data).dig_H4, (*bme280_data).dig_H5, (*bme280_data).dig_H6);
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}
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#undef r16uLE_buf
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#undef r16sLE_buf
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int i = 1;
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char cfg[2]={'\0', '\0'};
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lua_createtable(L, 3, 0); /* configuration table */
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cfg[0]=(char)config;
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lua_pushstring(L, cfg);
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lua_rawseti(L, -2, i++);
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cfg[0]=(char)bme280_ossh;
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lua_pushstring(L, cfg);
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lua_rawseti(L, -2, i++);
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cfg[0]=(char)bme280_mode;
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lua_pushstring(L, cfg);
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lua_rawseti(L, -2, i);
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return 2;
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}
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// Return T, QFE, H if no altitude given
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// Return T, QFE, H, QNH if altitude given
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int bme280_lua_read(lua_State* L) {
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double qfe;
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bme280_data = (bme280_data_p)lua_touserdata(L, 1);
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size_t reg_len;
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const char *buf = luaL_checklstring(L, 2, ®_len); // registers are P[3], T[3], H[2]
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if (reg_len != 8 && reg_len !=6) {
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luaL_error(L, "invalid readout data");
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}
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uint8_t calc_qnh = lua_isnumber(L, 3);
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// Must do Temp first since bme280_t_fine is used by the other compensation functions
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uint32_t adc_T = (uint32_t)(((buf[3] << 16) | (buf[4] << 8) | buf[5]) >> 4);
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if (adc_T == 0x80000 || adc_T == 0xfffff)
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return 0;
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lua_pushnumber(L, bme280_compensate_T(adc_T)/100.0);
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uint32_t adc_P = (uint32_t)(((buf[0] << 16) | (buf[1] << 8) | buf[2]) >> 4);
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NODE_DBG("adc_P: %d\n", adc_P);
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if (adc_P ==0x80000 || adc_P == 0xfffff) {
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lua_pushnil(L);
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calc_qnh = 0;
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} else {
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qfe = bme280_compensate_P(adc_P)/1000.0;
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lua_pushnumber (L, qfe);
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}
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|
||||
uint32_t adc_H = (uint32_t)((buf[6] << 8) | buf[7]);
|
||||
if (reg_len!=8 || adc_H == 0x8000 || adc_H == 0xffff)
|
||||
lua_pushnil(L);
|
||||
else
|
||||
lua_pushnumber (L, bme280_compensate_H(adc_H)/1000.0);
|
||||
|
||||
if (calc_qnh) { // have altitude
|
||||
int32_t h = luaL_checknumber(L, 3);
|
||||
double qnh = bme280_qfe2qnh(qfe, h);
|
||||
lua_pushnumber (L, qnh);
|
||||
return 4;
|
||||
}
|
||||
return 3;
|
||||
}
|
||||
|
||||
int bme280_lua_qfe2qnh(lua_State* L) {
|
||||
if (lua_isuserdata(L, 1) || lua_istable(L, 1)) { // allow to call it as object method, userdata have no use here
|
||||
lua_remove(L, 1);
|
||||
}
|
||||
double qfe = luaL_checknumber(L, 1);
|
||||
double h = luaL_checknumber(L, 2);
|
||||
double qnh = bme280_qfe2qnh(qfe, h);
|
||||
lua_pushnumber(L, qnh);
|
||||
return 1;
|
||||
}
|
||||
|
||||
int bme280_lua_altitude(lua_State* L) {
|
||||
if (lua_isuserdata(L, 1) || lua_istable(L, 1)) { // allow to call it as object method, userdata have no use here
|
||||
lua_remove(L, 1);
|
||||
}
|
||||
double P = luaL_checknumber(L, 1);
|
||||
double qnh = luaL_checknumber(L, 2);
|
||||
double h = (1.0 - pow((double)P/(double)qnh, 1.0/5.25588)) / 2.25577e-5;
|
||||
lua_pushnumber (L, h);
|
||||
return 1;
|
||||
}
|
||||
|
||||
int bme280_lua_dewpoint(lua_State* L) {
|
||||
if (lua_isuserdata(L, 1) || lua_istable(L, 1)) { // allow to call it as object method, userdata have no use here
|
||||
lua_remove(L, 1);
|
||||
}
|
||||
double H = luaL_checknumber(L, 1)/100.0; // percent
|
||||
double T = luaL_checknumber(L, 2);
|
||||
|
||||
const double c243 = 243.5;
|
||||
const double c17 = 17.67;
|
||||
double c = ln(H) + ((c17 * T) / (c243 + T));
|
||||
double d = (c243 * c)/(c17 - c);
|
||||
|
||||
lua_pushnumber (L, d);
|
||||
return 1;
|
||||
}
|
||||
|
||||
LROT_BEGIN(bme280_math, NULL, 0)
|
||||
LROT_FUNCENTRY( setup, bme280_lua_setup )
|
||||
LROT_FUNCENTRY( read, bme280_lua_read )
|
||||
LROT_FUNCENTRY( qfe2qnh, bme280_lua_qfe2qnh )
|
||||
LROT_FUNCENTRY( altitude, bme280_lua_altitude )
|
||||
LROT_FUNCENTRY( dewpoint, bme280_lua_dewpoint )
|
||||
LROT_END(bme280_math, NULL, 0)
|
||||
|
||||
|
||||
NODEMCU_MODULE(BME280_MATH, "bme280_math", bme280_math, NULL);
|
||||
|
|
@ -0,0 +1,211 @@
|
|||
# BME280 module
|
||||
| Since | Origin / Contributor | Maintainer | Source |
|
||||
| :----- | :-------------------- | :---------- | :------ |
|
||||
| 2020-10-04 | [vsky279](https://github.com/vsky279) | [vsky279](https://github.com/vsky279) | [bme280.c](../../app/modules/bme280.c)|
|
||||
|
||||
This module communicates with [BME280/BMP280 temperature/air presssure/humidity sensors](http://www.bosch-sensortec.com/bst/products/all_products/bme280) (Bosch Sensortec) through [I2C](../modules/i2c.md) interface.
|
||||
|
||||
Note: the module works only with the [bme280_math](../modules/bme280_math) module.
|
||||
|
||||
## bme280.setup()
|
||||
|
||||
Creates bme280sensor object and initializes module. Initialization is mandatory before read values. Note that there has to be a delay between some tens to hundreds of milliseconds between calling `setup()` and reading measurements.
|
||||
|
||||
Functions supported by bme280sensor object:
|
||||
- [setup()](#sobjsetup)
|
||||
- [read()](#sobjread)
|
||||
- [startreadout()](#sobjstartreadout)
|
||||
- [qfe2qnh](#sobjqfe2qnh)
|
||||
- [altitude](#sobjaltitude)
|
||||
- [dewpoint](#sobjdewpoint)
|
||||
|
||||
#### Syntax
|
||||
|
||||
`bme280.setup(id, [address, temp_oss, press_oss, humi_oss, power_mode, inactive_duration, IIR_filter])`
|
||||
|
||||
#### Parameters
|
||||
- `id` - I2C bus number
|
||||
- (optional)`address` - BME280 sensor address. `1` for `BME280_I2C_ADDRESS1 = 0x76`, `2` for `BME280_I2C_ADDRESS2 = 0x77`. Default sensor address is `BME280_I2C_ADDRESS1`.
|
||||
- (optional) `temp_oss` - Controls oversampling of temperature data. Default oversampling is 16x.
|
||||
- (optional) `press_oss` - Controls oversampling of pressure data. Default oversampling is 16x.
|
||||
- (optional) `humi_oss` - Controls oversampling of humidity data. Default oversampling is 16x
|
||||
- (optional) `sensor_mode` - Controls the sensor mode of the device. Default sensor more is normal.
|
||||
- (optional) `inactive_duration` - Controls inactive duration in normal mode. Default inactive duration is 20ms.
|
||||
- (optional) `IIR_filter` - Controls the time constant of the IIR filter. Default filter coefficient is 16.
|
||||
- (optional) `cold_start` - If 0 then the BME280 chip is not initialised. Useful in a battery operated setup when the ESP deep sleeps and on wakeup needs to initialise the driver (the module) but not the chip itself. The chip was kept powered (sleeping too) and is holding the latest reading that should be fetched quickly before another reading starts (`bme280sensor:startreadout()`). By default the chip is initialised.
|
||||
|
||||
|`temp_oss`, `press_oss`, `humi_oss`|Data oversampling|
|
||||
|-----|-----------------|
|
||||
|0|Skipped (output set to 0x80000)|
|
||||
|1|oversampling ×1|
|
||||
|2|oversampling ×2|
|
||||
|3|oversampling ×4|
|
||||
|4|oversampling ×8|
|
||||
|**5**|**oversampling ×16**|
|
||||
|
||||
|`sensor_mode`|Sensor mode|
|
||||
|-----|-----------------|
|
||||
|0|Sleep mode|
|
||||
|1 and 2|Forced mode|
|
||||
|**3**|**Normal mode**|
|
||||
|
||||
Using forced mode is recommended for applications which require low sampling rate or hostbased synchronization. The sensor enters into sleep mode after a forced readout. Please refer to BME280 Final Datasheet for more details.
|
||||
|
||||
|`inactive_duration`|t standby (ms)|
|
||||
|-----|-----------------|
|
||||
|0|0.5|
|
||||
|1|62.5|
|
||||
|2|125|
|
||||
|3|250|
|
||||
|4|500|
|
||||
|5|1000|
|
||||
|6|10|
|
||||
|**7**|**20**|
|
||||
|
||||
|`IIR_filter`|Filter coefficient |
|
||||
|-----|-----------------|
|
||||
|0|Filter off|
|
||||
|1|2|
|
||||
|2|4|
|
||||
|3|8|
|
||||
|**4**|**16**|
|
||||
|
||||
#### Returns
|
||||
`sobj` - BME280 Sensor Object (`nil` if initialization has failed)
|
||||
|
||||
## BME280 Sensor Object Methods
|
||||
|
||||
### sobj:setup()
|
||||
|
||||
Re-initializes the sensor.
|
||||
|
||||
### Parameters
|
||||
|
||||
Parameters are the same as for the [bme280.setup](#bme280setup) function.
|
||||
|
||||
### Return
|
||||
|
||||
Returned values are the same as for the [bme280.setup](#bme280setup) function.
|
||||
|
||||
### sobj:altitude()
|
||||
|
||||
For given air pressure (called QFE in aviation - see [wiki QNH article](https://en.wikipedia.org/wiki/QNH)) and sea level air pressure returns the altitude in meters, i.e. altimeter function.
|
||||
|
||||
#### Syntax
|
||||
`sobj:altitude(P, QNH)`
|
||||
|
||||
#### Parameters
|
||||
- `P` measured pressure
|
||||
- `QNH` current sea level pressure
|
||||
|
||||
#### Returns
|
||||
altitude in meters of measurement point
|
||||
|
||||
## sobj:dewpoint()
|
||||
|
||||
For given temperature and relative humidity returns the dew point in celsius.
|
||||
|
||||
#### Syntax
|
||||
`sobj:dewpoint(H, T)`
|
||||
|
||||
#### Parameters
|
||||
- `H` relative humidity in percent (100 means 100%)
|
||||
- `T` temperate in celsius
|
||||
|
||||
#### Returns
|
||||
dew point in celsisus
|
||||
|
||||
## sobj:qfe2qnh()
|
||||
|
||||
For given altitude converts the air pressure to sea level air pressure ([QNH](https://en.wikipedia.org/wiki/QNH)).
|
||||
|
||||
#### Syntax
|
||||
`sobj:qfe2qnh(P, altitude)`
|
||||
|
||||
#### Parameters
|
||||
- `P` measured pressure
|
||||
- `altitude` altitude in meters of measurement point
|
||||
|
||||
#### Returns
|
||||
sea level pressure
|
||||
|
||||
|
||||
## sobj:read()
|
||||
|
||||
Reads the sensor and returns the temperature, the air pressure, the air relative humidity and see level pressure when `altitude` is specified.
|
||||
|
||||
#### Syntax
|
||||
`sobj:read([altitude])`
|
||||
|
||||
#### Parameters
|
||||
- (optional) `altitude`- altitude in meters of measurement point. If provided also the air pressure converted to sea level air pressure is returned.
|
||||
|
||||
#### Returns
|
||||
- `T` temperature in celsius
|
||||
- `P` air pressure in hectopascals
|
||||
- `H` relative humidity in percent
|
||||
- (optional) `QNH` air pressure in hectopascals (when `altitude` is specified)
|
||||
|
||||
Returns `nil` if the readout is not successful.
|
||||
|
||||
## sobj:startreadout()
|
||||
Starts readout (turns the sensor into forced mode). After the readout the sensor turns to sleep mode. Callback function is called with readout results.
|
||||
|
||||
#### Syntax
|
||||
`sobj:startreadout(delay, callback)`
|
||||
|
||||
#### Parameters
|
||||
- `callback` if provided it will be invoked after given `delay`. Callback parameters are identical to `sobj:read` results.
|
||||
- `altitude` in meters of measurement point (QNH is returned when specified)
|
||||
- `delay` sets sensor to forced mode and calls the `callback` (if provided) after given number of milliseconds. For 0 the default delay is set to 113ms (sufficient time to perform reading for oversampling settings 16x). For different oversampling setting please refer to [BME280 Final Datasheet - Appendix B: Measurement time and current calculation](https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf#page=51).
|
||||
|
||||
#### Returns
|
||||
`nil`
|
||||
|
||||
#### Example
|
||||
```lua
|
||||
alt=320 -- altitude of the measurement place
|
||||
|
||||
sda, scl = 3, 4
|
||||
i2c.setup(0, sda, scl, i2c.SLOW)
|
||||
s = require('bme280').setup(0)
|
||||
|
||||
tmr.create():alarm(500, tmr.ALARM_AUTO, function()
|
||||
local T, P, H, QNH = s:read(alt)
|
||||
local D = s:dewpoint(H, T)
|
||||
print(("T=%.2f, QFE=%.3f, QNH=%.3f, humidity=%.3f, dewpoint=%.2f"):format(T, P, QNH, H, D))
|
||||
end)
|
||||
```
|
||||
|
||||
Example with sensor in sleep mode between readouts (asynchronous readouts)
|
||||
```lua
|
||||
alt=320 -- altitude of the measurement place
|
||||
|
||||
sda, scl = 3, 4
|
||||
i2c.setup(0, sda, scl, i2c.SLOW)
|
||||
s = require('bme280').setup(0, nil, nil, nil, nil, 0) -- initialize to sleep mode
|
||||
|
||||
tmr.create():alarm(1000, tmr.ALARM_AUTO, function()
|
||||
s:startreadout(function(T, P, H, QNH)
|
||||
local D = s:dewpoint(H, T)
|
||||
print(("T=%.2f, QFE=%.3f, QNH=%.3f, humidity=%.3f, dewpoint=%.2f"):format(T, P, QNH, H, D))
|
||||
end, alt)
|
||||
end)
|
||||
```
|
||||
|
||||
Altimeter function - calculate altitude based on current sea level pressure (QNH) and measure pressure
|
||||
```lua
|
||||
alt = 0 -- initial altitude
|
||||
|
||||
sda, scl = 3, 4
|
||||
i2c.setup(0, sda, scl, i2c.SLOW)
|
||||
s = require('bme280').setup(0)
|
||||
|
||||
tmr.create():alarm(100, tmr.ALARM_AUTO, function()
|
||||
local _, P, _, lQNH = s:read(alt)
|
||||
if not QNH then QNH = lQNH end
|
||||
local altitude = s:altitude(P, QNH)
|
||||
|
||||
print(("altitude=%.3f m"):format(altitude))
|
||||
end)
|
||||
```
|
||||
|
|
@ -0,0 +1,149 @@
|
|||
# BME280_math module
|
||||
| Since | Origin / Contributor | Maintainer | Source |
|
||||
| :----- | :-------------------- | :---------- | :------ |
|
||||
| 2016-02-21 | [vsky279](https://github.com/vsky279) | [vsky279](https://github.com/vsky279) | [bme280_math.c](../../app/modules/bme280_math.c)|
|
||||
|
||||
This module provides calculation routines for [BME280/BMP280 temperature/air presssure/humidity sensors](http://www.bosch-sensortec.com/bst/products/all_products/bme280) (Bosch Sensortec). Communication with the sensor is ensured by Lua code through I2C or SPI interface. Read registers are passed to the module to calculate measured values.
|
||||
|
||||
See [bme280](../lua-modules/bme280.md) Lua module for examples.
|
||||
|
||||
## bme280_math.altitude()
|
||||
|
||||
For given air pressure (called QFE in aviation - see [wiki QNH article](https://en.wikipedia.org/wiki/QNH)) and sea level air pressure returns the altitude in meters, i.e. altimeter function.
|
||||
|
||||
#### Syntax
|
||||
`bme280_math.altitude([self], P, QNH)`
|
||||
|
||||
#### Parameters
|
||||
- (optional) `self` userdata or table structure so that the function can be directly called as object method, parameter is ignored in the calculation
|
||||
- `P` measured pressure
|
||||
- `QNH` current sea level pressure
|
||||
|
||||
#### Returns
|
||||
altitude in meters of measurement point
|
||||
|
||||
## bme280_math.dewpoint()
|
||||
|
||||
For given temperature and relative humidity returns the dew point in celsius.
|
||||
|
||||
#### Syntax
|
||||
`bme280_math.dewpoint([self], H, T)`
|
||||
|
||||
#### Parameters
|
||||
- (optional) `self` userdata or table structure so that the function can be directly called as object method, parameter is ignored in the calculation
|
||||
- `H` relative humidity in percent (100 means 100%)
|
||||
- `T` temperate in celsius
|
||||
|
||||
#### Returns
|
||||
dew point in celsisus
|
||||
|
||||
## bme280_math.qfe2qnh()
|
||||
|
||||
For given altitude converts the air pressure to sea level air pressure ([QNH](https://en.wikipedia.org/wiki/QNH)).
|
||||
|
||||
#### Syntax
|
||||
`bme280_math.qfe2qnh([self], P, altitude)`
|
||||
|
||||
#### Parameters
|
||||
- (optional) `self` userdata or table structure so that the function can be directly called as object method, parameter is ignored in the calculation
|
||||
- `P` measured pressure
|
||||
- `altitude` altitude in meters of measurement point
|
||||
|
||||
#### Returns
|
||||
sea level pressure
|
||||
|
||||
|
||||
## bme280_math.read()
|
||||
|
||||
Reads the sensor and returns the temperature, the air pressure, the air relative humidity and see level air pressure when `altitude` is specified.
|
||||
|
||||
#### Syntax
|
||||
`bme280_math.read(bme280sensor, registers, [altitude])`
|
||||
|
||||
#### Parameters
|
||||
- `bme280sensor` - BME280 sensor user data returned by `bme280_math.setup()`
|
||||
- `registers` - string of 8 bytes (chars) registers read from `BME280_REGISTER_PRESS`
|
||||
- (optional) `altitude`- altitude in meters of measurement point. If provided also the air pressure converted to sea level air pressure is returned.
|
||||
|
||||
#### Returns
|
||||
- `T` temperature in celsius
|
||||
- `P` air pressure in hectopascals
|
||||
- `H` relative humidity in percent
|
||||
- (optional) `QNH` air pressure in hectopascals
|
||||
|
||||
Returns `nil` if the conversion is not successful.
|
||||
|
||||
## bme280_math.setup()
|
||||
|
||||
Initializes module. Initialization is mandatory before read values.
|
||||
|
||||
#### Syntax
|
||||
|
||||
`bme280_math.setup(registers, [temp_oss, press_oss, humi_oss, power_mode, inactive_duration, IIR_filter])`
|
||||
|
||||
#### Parameters
|
||||
- registers - String of configuration registers read from the BME280 sensor. It consists of 6 bytes (chars) of `BME280_REGISTER_DIG_T`, 18 bytes (chars) `BME280_REGISTER_DIG_P` and optional (not present for BMP280 sensor) 8 bytes (chars) of `BME280_REGISTER_DIG_H1` (1 byte) and `BME280_REGISTER_DIG_H2` (7 bytes)
|
||||
- (optional) `temp_oss` - Controls oversampling of temperature data. Default oversampling is 16x.
|
||||
- (optional) `press_oss` - Controls oversampling of pressure data. Default oversampling is 16x.
|
||||
- (optional) `humi_oss` - Controls oversampling of humidity data. Default oversampling is 16x
|
||||
- (optional) `sensor_mode` - Controls the sensor mode of the device. Default sensor more is normal.
|
||||
- (optional) `inactive_duration` - Controls inactive duration in normal mode. Default inactive duration is 20ms.
|
||||
- (optional) `IIR_filter` - Controls the time constant of the IIR filter. Default filter coefficient is 16.
|
||||
|
||||
|`temp_oss`, `press_oss`, `humi_oss`|Data oversampling|
|
||||
|-----|-----------------|
|
||||
|0|Skipped (output set to 0x80000)|
|
||||
|1|oversampling ×1|
|
||||
|2|oversampling ×2|
|
||||
|3|oversampling ×4|
|
||||
|4|oversampling ×8|
|
||||
|**5**|**oversampling ×16**|
|
||||
|
||||
|`sensor_mode`|Sensor mode|
|
||||
|-----|-----------------|
|
||||
|0|Sleep mode|
|
||||
|1 and 2|Forced mode|
|
||||
|**3**|**Normal mode**|
|
||||
|
||||
Using forced mode is recommended for applications which require low sampling rate or hostbased synchronization. The sensor enters into sleep mode after a forced readout. Please refer to BME280 Final Datasheet for more details.
|
||||
|
||||
|`inactive_duration`|t standby (ms)|
|
||||
|-----|-----------------|
|
||||
|0|0.5|
|
||||
|1|62.5|
|
||||
|2|125|
|
||||
|3|250|
|
||||
|4|500|
|
||||
|5|1000|
|
||||
|6|10|
|
||||
|**7**|**20**|
|
||||
|
||||
|`IIR_filter`|Filter coefficient |
|
||||
|-----|-----------------|
|
||||
|0|Filter off|
|
||||
|1|2|
|
||||
|2|4|
|
||||
|3|8|
|
||||
|**4**|**16**|
|
||||
|
||||
#### Returns
|
||||
- `bme280sensor` user data (`nil` if initialization has failed)
|
||||
- `config` 3 (2 for BME280) field table with configuration parameters to be written to registers `BME280_REGISTER_CONFIG`, `BME280_REGISTER_CONTROL_HUM`, `BME280_REGISTER_CONTROL` consecutively
|
||||
|
||||
#### Example
|
||||
See [bme280](../lua-modules/bme280.md) Lua module documentation.
|
||||
|
||||
|
||||
## BME280 (selected) registers
|
||||
| name | address |
|
||||
|-------|----------|
|
||||
| BME280_REGISTER_CONTROL | 0xF4 |
|
||||
| BME280_REGISTER_CONTROL_HUM | 0xF2 |
|
||||
| BME280_REGISTER_CONFIG| 0xF5 |
|
||||
| BME280_REGISTER_CHIPID | 0xD0 |
|
||||
| BME280_REGISTER_DIG_T | 0x88 (0x88-0x8D (6)) |
|
||||
| BME280_REGISTER_DIG_P | 0x8E (0x8E-0x9F (18)) |
|
||||
| BME280_REGISTER_DIG_H1 | 0xA1 |
|
||||
| BME280_REGISTER_DIG_H2 | 0xE1 (0xE1-0xE7 (7)) |
|
||||
| BME280_REGISTER_PRESS | 0xF7 (0xF7-0xF9 (8)) |
|
||||
|
||||
|
|
@ -0,0 +1,173 @@
|
|||
--[[
|
||||
BME280 Lua module
|
||||
Requires i2c and bme280_math module
|
||||
Written by Lukas Voborsky, @voborsky
|
||||
]]
|
||||
|
||||
local bme280 = {}
|
||||
|
||||
-- bme280.setup()
|
||||
-- bme280:setup()
|
||||
-- bme280:read()
|
||||
-- bme280:altitude()
|
||||
-- bme280:dewpoint()
|
||||
-- bme280:qfe2qnh()
|
||||
-- bme280:startreadout()
|
||||
|
||||
local type, assert = type, assert
|
||||
local table_concat, math_floor = table.concat, math.floor
|
||||
local i2c_start, i2c_stop, i2c_address, i2c_read, i2c_write, i2c_TRANSMITTER, i2c_RECEIVER =
|
||||
i2c.start, i2c.stop, i2c.address, i2c.read, i2c.write, i2c.TRANSMITTER, i2c.RECEIVER
|
||||
local bme280_math_setup, bme280_math_read, bme280_math_qfe2qnh, bme280_math_altitude, bme280_math_dewpoint =
|
||||
bme280_math.setup, bme280_math.read, bme280_math.qfe2qnh, bme280_math.altitude, bme280_math.dewpoint
|
||||
local tmr_create, tmr_ALARM_SINGLE = tmr.create, tmr.ALARM_SINGLE
|
||||
|
||||
|
||||
local BME280_I2C_ADDRESS1 = 0x76
|
||||
local BME280_I2C_ADDRESS2 = 0x77
|
||||
|
||||
local BME280_REGISTER_CONTROL = 0xF4
|
||||
local BME280_REGISTER_CONTROL_HUM = 0xF2
|
||||
local BME280_REGISTER_CONFIG= 0xF5
|
||||
local BME280_REGISTER_CHIPID = 0xD0
|
||||
|
||||
local BME280_REGISTER_DIG_T = 0x88 -- 0x88-0x8D ( 6)
|
||||
local BME280_REGISTER_DIG_P = 0x8E -- 0x8E-0x9F (18)
|
||||
local BME280_REGISTER_DIG_H1 = 0xA1 -- 0xA1 ( 1)
|
||||
local BME280_REGISTER_DIG_H2 = 0xE1 -- 0xE1-0xE7 ( 7)
|
||||
local BME280_REGISTER_PRESS = 0xF7 -- 0xF7-0xF9
|
||||
|
||||
-- local BME280_FORCED_MODE = 0x01
|
||||
|
||||
-- maximum measurement time in ms for maximum oversampling for all measures
|
||||
-- 113 > 1.25 + 2.3*16 + 2.3*16 + 0.575 + 2.3*16 + 0.575 ms
|
||||
local BME280_SAMPLING_DELAY =113
|
||||
|
||||
-- Local functions
|
||||
local read_reg
|
||||
local write_reg
|
||||
local bme280_setup
|
||||
local bme280_read
|
||||
local bme280_startreadout
|
||||
|
||||
-- -- Note that the space between debug and the arglist is there for a reason
|
||||
-- -- so that a simple global edit " debug(" -> "-- debug(" or v.v. to
|
||||
-- -- toggle debug compiled into the module.
|
||||
-- local print, node_heap = print, node.heap
|
||||
-- local function debug (fmt, ...) -- upval: cnt (, print, node_heap)
|
||||
-- if not bme280.debug then return end
|
||||
-- if (...) then fmt = fmt:format(...) end
|
||||
-- print("[bme280]", node_heap(), fmt)
|
||||
-- end
|
||||
|
||||
--------------------------- Set up the bme280 object ----------------------------
|
||||
-- bme280 has method setup to create the sensor object and setup the sensor
|
||||
-- object created by bme280.setup() has methods: read, qfe2qnh, altitude, dewpoint
|
||||
---------------------------------------------------------------------------------
|
||||
|
||||
function bme280.setup(id, addr, temp_oss, press_oss, humi_oss, power_mode, inactive_duration, IIR_filter, full_init)
|
||||
return bme280_setup(nil, id,
|
||||
addr, temp_oss, press_oss, humi_oss, power_mode, inactive_duration, IIR_filter, full_init)
|
||||
end
|
||||
|
||||
------------------------------------------------------------------------------
|
||||
function bme280_setup(self, id, addr,
|
||||
temp_oss, press_oss, humi_oss, power_mode, inactive_duration, IIR_filter, full_init)
|
||||
|
||||
addr = (addr==2) and BME280_I2C_ADDRESS2 or BME280_I2C_ADDRESS1
|
||||
full_init = full_init or true
|
||||
|
||||
-- debug("%d %x %d", id, addr, BME280_REGISTER_CHIPID)
|
||||
local chipid = read_reg(id, addr, BME280_REGISTER_CHIPID, 1)
|
||||
if not chipid then
|
||||
return nil
|
||||
end
|
||||
-- debug("chip_id: %x", chipid:byte(1))
|
||||
local isbme = (chipid:byte(1) == 0x60)
|
||||
|
||||
local buf = {}
|
||||
buf[1] = read_reg(id, addr, BME280_REGISTER_DIG_T, 6)
|
||||
buf[2] = read_reg(id, addr, BME280_REGISTER_DIG_P, 18)
|
||||
if (isbme) then
|
||||
buf[3] = read_reg(id, addr, BME280_REGISTER_DIG_H1, 1)
|
||||
buf[4] = read_reg(id, addr, BME280_REGISTER_DIG_H2, 7)
|
||||
end
|
||||
|
||||
local sensor, config = bme280_math_setup(table_concat(buf),
|
||||
temp_oss, press_oss, humi_oss, power_mode, inactive_duration, IIR_filter)
|
||||
self = self or {
|
||||
setup = bme280_setup,
|
||||
read = bme280_read,
|
||||
startreadout = bme280_startreadout,
|
||||
qfe2qnh = bme280_math_qfe2qnh,
|
||||
altitude = bme280_math_altitude,
|
||||
dewpoint = bme280_math_dewpoint
|
||||
}
|
||||
self.id, self.addr = id, addr
|
||||
self._sensor, self._config, self._isbme = sensor, config, isbme
|
||||
|
||||
if (full_init) then
|
||||
write_reg(id, addr, BME280_REGISTER_CONFIG, config[1])
|
||||
if (isbme) then write_reg(id, addr, BME280_REGISTER_CONTROL_HUM, config[2]) end
|
||||
write_reg(id, addr, BME280_REGISTER_CONTROL, config[3])
|
||||
end
|
||||
|
||||
return self
|
||||
end
|
||||
|
||||
function bme280_read(self, alt)
|
||||
local buf = read_reg(self.id, self.addr, BME280_REGISTER_PRESS, 8) -- registers are P[3], T[3], H[2]
|
||||
if buf then
|
||||
return bme280_math_read(self._sensor, buf, alt)
|
||||
else
|
||||
return nil
|
||||
end
|
||||
end
|
||||
|
||||
function bme280_startreadout(self, callback, delay, alt)
|
||||
assert(type(callback) == "function", "invalid callback parameter")
|
||||
|
||||
delay = delay or BME280_SAMPLING_DELAY
|
||||
|
||||
if self._isbme then write_reg(self.id, self.addr, BME280_REGISTER_CONTROL_HUM, self._config[2]) end
|
||||
write_reg(self.id, self.addr, BME280_REGISTER_CONTROL, math_floor(self._config[3]:byte(1)/4)+ 1)
|
||||
-- math_floor(self._config[3]:byte(1)/4)+ 1
|
||||
-- an awful way to avoid bit operations but calculate (config[3] & 0xFC) | BME280_FORCED_MODE
|
||||
-- Lua 5.3 integer division // would be more suitable
|
||||
|
||||
tmr_create():alarm(delay, tmr_ALARM_SINGLE,
|
||||
function()
|
||||
callback(bme280_read(self, alt))
|
||||
end
|
||||
)
|
||||
end
|
||||
|
||||
function write_reg(id, dev_addr, reg_addr, data)
|
||||
i2c_start(id)
|
||||
if not i2c_address(id, dev_addr, i2c_TRANSMITTER) then
|
||||
-- debug("No ACK on address: %x", dev_addr)
|
||||
return nil
|
||||
end
|
||||
i2c_write(id, reg_addr)
|
||||
local c = i2c_write(id, data)
|
||||
i2c_stop(id)
|
||||
return c
|
||||
end
|
||||
|
||||
function read_reg(id, dev_addr, reg_addr, n)
|
||||
i2c_start(id)
|
||||
if not i2c_address(id, dev_addr, i2c_TRANSMITTER) then
|
||||
-- debug("No ACK on address: %x", dev_addr)
|
||||
return nil
|
||||
end
|
||||
i2c_write(id, reg_addr)
|
||||
i2c_stop(id)
|
||||
i2c_start(id)
|
||||
i2c_address(id, dev_addr, i2c_RECEIVER)
|
||||
local c = i2c_read(id, n)
|
||||
i2c_stop(id)
|
||||
return c
|
||||
end
|
||||
|
||||
------------------------------------------------ -----------------------------
|
||||
return bme280
|
||||
|
|
@ -48,6 +48,7 @@ pages:
|
|||
- Lua Modules:
|
||||
- 'Lua modules directory': 'lua-modules/README.md'
|
||||
- 'bh1750': 'lua-modules/bh1750.md'
|
||||
- 'bme280': 'lua-modules/bme280.md'
|
||||
- 'cohelper': 'lua-modules/cohelper.md'
|
||||
- 'ds18b20': 'lua-modules/ds18b20.md'
|
||||
- 'ds3231': 'lua-modules/ds3231.md'
|
||||
|
|
@ -73,6 +74,7 @@ pages:
|
|||
- 'bit': 'modules/bit.md'
|
||||
- 'bloom' : 'modules/bloom.md'
|
||||
- 'bme280': 'modules/bme280.md'
|
||||
- 'bme280_math': 'modules/bme280_math.md'
|
||||
- 'bme680': 'modules/bme680.md'
|
||||
- 'bmp085': 'modules/bmp085.md'
|
||||
- 'cjson': 'modules/cjson.md'
|
||||
|
|
|
|||
|
|
@ -112,6 +112,15 @@ stds.nodemcu_libs = {
|
|||
temp = empty
|
||||
}
|
||||
},
|
||||
bme280_math = {
|
||||
fields = {
|
||||
altitude = empty,
|
||||
dewpoint = empty,
|
||||
qfe2qnh = empty,
|
||||
read = empty,
|
||||
setup = empty
|
||||
}
|
||||
},
|
||||
bme680 = {
|
||||
fields = {
|
||||
altitude = empty,
|
||||
|
|
|
|||
Loading…
Reference in New Issue