-- *************************************************************************** -- BH1750 module for ESP8266 with nodeMCU -- BH1750 compatible tested 2015-1-22 -- -- Written by xiaohu -- -- MIT license, http://opensource.org/licenses/MIT -- *************************************************************************** local moduleName = ... local M = {} _G[moduleName] = M --I2C slave address of GY-30 local GY_30_address = 0x23 -- i2c interface ID local id = 0 --LUX local l --CMD local CMD = 0x10 local init = false --Make it more faster local i2c = i2c function M.init(sda, scl) i2c.setup(id, sda, scl, i2c.SLOW) --print("i2c ok..") init = true end local function read_data(ADDR, commands, length) i2c.start(id) i2c.address(id, ADDR, i2c.TRANSMITTER) i2c.write(id, commands) i2c.stop(id) i2c.start(id) i2c.address(id, ADDR,i2c.RECEIVER) tmr.delay(200000) local c = i2c.read(id, length) i2c.stop(id) return c end local function read_lux() local dataT = read_data(GY_30_address, CMD, 2) --Make it more faster local UT = dataT:byte(1) * 256 + dataT:byte(2) l = (UT*1000/12) return(l) end function M.read() if (not init) then print("init() must be called before read.") else read_lux() end end function M.getlux() return l end return M