VIP6(xingyuewang,http://517513.cn) commit si7021 module.
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HuangRui
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tmr.alarm(0, 60000, 1, function()
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SDA_PIN = 6 -- sda pin, GPIO12
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SCL_PIN = 5 -- scl pin, GPIO14
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si7021 = require("si7021")
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si7021.init(SDA_PIN, SCL_PIN)
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si7021.read(OSS)
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h = si7021.getHumidity()
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t = si7021.getTemperature()
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-- pressure in differents units
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print("Humidity: "..(h / 100).."."..(h % 100).." %")
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-- temperature in degrees Celsius and Farenheit
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print("Temperature: "..(t/100).."."..(t%100).." deg C")
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print("Temperature: "..(9 * t / 500 + 32).."."..(9 * t / 50 % 10).." deg F")
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-- release module
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si7021 = nil
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package.loaded["si7021"]=nil
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end)
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--创建一个定时器
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tmr.alarm(0, 60000, 1, function()
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SDA_PIN = 6 -- sda pin, GPIO12
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SCL_PIN = 5 -- scl pin, GPIO14
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si7021 = require("si7021")
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si7021.init(SDA_PIN, SCL_PIN)
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si7021.read(OSS)
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Hum = si7021.getHumidity()
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Temp = si7021.getTemperature()
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--定义数据变量格式
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PostData = "[{\"Name\":\"T\",\"Value\":\"" .. (Temp/100).."."..(Temp%100) .. "\"},{\"Name\":\"H\",\"Value\":\"" .. (Hum/100).."."..(Hum%100) .. "\"}]"
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--创建一个TCP连接
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socket=net.createConnection(net.TCP, 0)
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--域名解析IP地址并赋值
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socket:dns("www.lewei50.com", function(conn, ip)
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ServerIP = ip
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print("Connection IP:" .. ServerIP)
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end)
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--开始连接服务器
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socket:connect(80, ServerIP)
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socket:on("connection", function(sck) end)
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--HTTP请求头定义
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socket:send("POST /api/V1/gateway/UpdateSensors/yourID HTTP/1.1\r\n" ..
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"Host: www.lewei50.com\r\n" ..
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"Content-Length: " .. string.len(PostData) .. "\r\n" ..
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"userkey: yourKEY\r\n\r\n" ..
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PostData .. "\r\n")
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--HTTP响应内容
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socket:on("receive", function(sck, response)
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print(response)
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end)
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-- release module
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si7021 = nil
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package.loaded["si7021"]=nil
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end)
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# si7021 module
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##Require
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```lua
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si7021 = require("si7021")
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```
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## Release
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```lua
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si7021 = nil
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package.loaded["si7021"]=nil
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```
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<a id="si7021_init"></a>
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##init()
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####Description
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Setting the i2c pin of si7021.<br />
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####Syntax
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init(sda, scl)
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####Parameters
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sda: 1~12, IO index.<br />
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scl: 1~12, IO index.<br />
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####Returns
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nil
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####Example
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```lua
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si7021 = require("si7021")
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gpio5 = 1
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gpio4 = 2
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sda = gpio5
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scl = gpio4
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si7021.init(sda, scl)
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-- Don't forget to release it after use
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si7021 = nil
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package.loaded["si7021"]=nil
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```
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####See also
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**-** []()
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<a id="si7021_read"></a>
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##read()
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####Description
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Read temperature and humidity from si7021.<br />
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####Syntax
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read()
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####Parameters
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nil.<br />
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####Returns
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nil(Why?).<br />
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####Example
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```lua
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si7021 = require("si7021")
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sda = 1
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scl = 2
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si7021.init(sda, scl)
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r = si7021.read()
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print(r)
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-- Don't forget to release it after use
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si7021 = nil
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package.loaded["si7021"]=nil
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```
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####See also
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**-** []()
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<a id="si7021_getHumidity"></a>
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##getHumidity()
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####Description
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Get humidity from si7021.<br />
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####Syntax
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getHumidity()
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####Parameters
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nil.<br />
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####Returns
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h: Integer, humidity from si7021.
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####Example
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```lua
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si7021 = require("si7021")
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sda = 1
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scl = 2
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si7021.init(sda, scl)
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h = si7021.getHumidity()
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print(h)
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-- Don't forget to release it after use
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si7021 = nil
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package.loaded["si7021"]=nil
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```
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####See also
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**-** []()
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<a id="si7021_getTemperature"></a>
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##getTemperature()
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####Description
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Get temperature from si7021.<br />
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####Syntax
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getTemperature()
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####Parameters
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nil.<br />
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####Returns
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t: Integer, temperature from si7021.
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####Example
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```lua
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si7021 = require("si7021")
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sda = 1
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scl = 2
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si7021.init(sda, scl)
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t = si7021.getTemperature()
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print(t)
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-- Don't forget to release it after use
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si7021 = nil
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package.loaded["si7021"]=nil
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```
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####See also
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**-** []()
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@ -0,0 +1,104 @@
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-- ***************************************************************************
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-- SI7021 module for ESP8266 with nodeMCU
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-- Si7021 compatible tested 2015-1-22
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--
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-- Written by VIP6
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--
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-- MIT license, http://opensource.org/licenses/MIT
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-- ***************************************************************************
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local moduleName = ...
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local M = {}
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_G[moduleName] = M
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--I2C slave address of Si70xx
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local Si7021_ADDR = 0x40
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--Commands
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local CMD_MEASURE_HUMIDITY_HOLD = 0xE5
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local CMD_MEASURE_HUMIDITY_NO_HOLD = 0xF5
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local CMD_MEASURE_TEMPERATURE_HOLD = 0xE3
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local CMD_MEASURE_TEMPERATURE_NO_HOLD = 0xF3
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-- temperature and pressure
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local t,h
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local init = false
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-- i2c interface ID
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local id = 0
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-- 16-bit two's complement
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-- value: 16-bit integer
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local function twoCompl(value)
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if value > 32767 then value = -(65535 - value + 1)
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end
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return value
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end
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-- read data from si7021
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-- ADDR: slave address
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-- commands: Commands of si7021
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-- length: bytes to read
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local function read_data(ADDR, commands, length)
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i2c.start(id)
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i2c.address(id, ADDR, i2c.TRANSMITTER)
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i2c.write(id, commands)
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i2c.stop(id)
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i2c.start(id)
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i2c.address(id, ADDR,i2c.RECEIVER)
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tmr.delay(20000)
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c = i2c.read(id, length)
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i2c.stop(id)
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return c
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end
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-- initialize module
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-- sda: SDA pin
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-- scl SCL pin
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function M.init(sda, scl)
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i2c.setup(id, sda, scl, i2c.SLOW)
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--print("i2c ok..")
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init = true
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end
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-- read humidity from si7021
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local function read_humi()
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dataH = read_data(Si7021_ADDR, CMD_MEASURE_HUMIDITY_HOLD, 2)
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UH = string.byte(dataH, 1) * 256 + string.byte(dataH, 2)
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h = ((UH*12500+65536/2)/65536 - 600)
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return(h)
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end
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-- read temperature from si7021
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local function read_temp()
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dataT = read_data(Si7021_ADDR, CMD_MEASURE_TEMPERATURE_HOLD, 2)
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UT = string.byte(dataT, 1) * 256 + string.byte(dataT, 2)
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t = ((UT*17572+65536/2)/65536 - 4685)
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return(t)
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end
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-- read temperature and humidity from si7021
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function M.read()
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if (not init) then
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print("init() must be called before read.")
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else
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read_humi()
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read_temp()
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end
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end;
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-- get humidity
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function M.getHumidity()
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return h
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end
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-- get temperature
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function M.getTemperature()
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return t
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end
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return M
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