44 lines
1.6 KiB
Lua
44 lines
1.6 KiB
Lua
-- Lit le capteur I2C HTU21D de mesure d'humidité et de température
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-- https://github.com/zuzu59/NodeMCU_Lua/tree/master/Mesures/humidity/bolo-thingspeak/docu/HTU21D.txt
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function readHTU21D()
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if verbose then print("\n 0_htu21d.lua zf200119.1517 \n") end
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id = 0 sda = 5 scl = 6 addr = 0x40
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HUMIDITY = 0xE5 TEMPERATURE = 0xE3
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i2c.setup(id, sda, scl, i2c.SLOW) sda = nil scl = nil
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function read_HTU21D(zreg, zdelay)
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i2c.start(id) i2c.address(id, addr, i2c.TRANSMITTER)
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i2c.write(id, zreg) i2c.stop(id)
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i2c.start(id) i2c.address(id, addr, i2c.RECEIVER)
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tmr.delay(zdelay)
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r = i2c.read(id,3) i2c.stop(id)
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return r
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end
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function readTemp()
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r = read_HTU21D(TEMPERATURE, 50000)
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r = (bit.band((bit.lshift(string.byte(r,1),8)+string.byte(r,2)),0xfffc)*17572)/65536-4685
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return tonumber(string.format("%.1f", tostring(r/100)))
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end
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function readHumi()
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r = read_HTU21D(HUMIDITY, 16000)
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r = (bit.band((bit.lshift(string.byte(r,1),8)+string.byte(r,2)),0xfffc)*12500)/65536-600
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return tonumber(string.format("%.1f", tostring(r/100)))
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end
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ztemp1=readTemp() zhum1=readHumi()
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if verbose then print("Temperature: "..ztemp1.." °C") end
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if verbose then print("Humidity: "..zhum1.." %") end
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id=nil sda=nil scl=nil addr=nil HUMIDITY=nil TEMPERATURE=nil r=nil
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read_HTU21D=nil readTemp=nil readHumi=nil readHTU21D=nil
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if verbose then print(node.heap()) end
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collectgarbage()
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if verbose then print(node.heap()) end
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end
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readHTU21D()
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