68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
//
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// FILE: dht.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.14
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// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
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// URL: http://arduino.cc/playground/Main/DHTLib
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//
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// HISTORY:
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// see dht.cpp file
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//
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#ifndef dht_h
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#define dht_h
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// #if ARDUINO < 100
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// #include <WProgram.h>
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// #else
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// #include <Arduino.h>
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// #endif
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#include <stdint.h>
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#define DHT_LIB_VERSION "0.1.14"
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#define DHTLIB_OK 0
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#define DHTLIB_ERROR_CHECKSUM -1
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#define DHTLIB_ERROR_TIMEOUT -2
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#define DHTLIB_INVALID_VALUE -999
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#define DHTLIB_DHT11_WAKEUP 18
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#define DHTLIB_DHT_WAKEUP 1
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#define DHTLIB_DHT_UNI_WAKEUP 18
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// max timeout is 100 usec.
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// For a 16 Mhz proc 100 usec is 1600 clock cycles
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// loops using DHTLIB_TIMEOUT use at least 4 clock cycli
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// so 100 us takes max 400 loops
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// so by dividing F_CPU by 40000 we "fail" as fast as possible
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// ESP8266 uses delay_us get 1us time
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#define DHTLIB_TIMEOUT (100)
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// Platform specific I/O definitions
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#define DIRECT_READ(pin) (0x1 & GPIO_INPUT_GET(GPIO_ID_PIN(pin_num[pin])))
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#define DIRECT_MODE_INPUT(pin) GPIO_DIS_OUTPUT(pin_num[pin])
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#define DIRECT_MODE_OUTPUT(pin)
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#define DIRECT_WRITE_LOW(pin) (GPIO_OUTPUT_SET(GPIO_ID_PIN(pin_num[pin]), 0))
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#define DIRECT_WRITE_HIGH(pin) (GPIO_OUTPUT_SET(GPIO_ID_PIN(pin_num[pin]), 1))
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typedef enum {
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DHT11 = 0,
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DHT12,
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DHT22,
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DHT_NON11
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} dht_type;
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// return values:
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// DHTLIB_OK
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// DHTLIB_ERROR_CHECKSUM
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// DHTLIB_ERROR_TIMEOUT
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int dht_read(uint8_t pin, dht_type type);
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double dht_getHumidity(void);
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double dht_getTemperature(void);
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#endif
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//
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// END OF FILE
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//
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