58 lines
1.2 KiB
Lua
58 lines
1.2 KiB
Lua
-- Lit le capteur I2C HTU21D de mesure d'humidité et de température
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print("\n 0_get_data.lua zf191215.1329 \n")
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-- https://cdn-shop.adafruit.com/datasheets/1899_HTU21D.pdf
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-- Comparaison DHT22, AM2302, AM2320, AM2321, SHT71, HTU21D, Si7021, BME280
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-- http://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html
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-- Il est compatible avec le capteur SI7021 mais pas avec la lib SI7021 du NodeMCU Lua :-(
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-- source: https://github.com/famzah/nodemcu/tree/master/HTU21D-TLS
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-- source2: https://github.com/tebben/NodeMCU
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-- source3: https://github.com/codywon/NodeMCU-2
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scl = 1
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sda = 2
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id = 0
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addr = 0x40
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HUMIDITY = 0xE5
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TEMPERATURE = 0xE3
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SOFTRESET = 0xFE
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print(scl, sda, id, addr, HUMIDITY, TEMPERATURE, SOFTRESET)
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zspeed = i2c.setup(id, sda, scl, 500000)
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print(zspeed)
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i2c.start(id)
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zerr = i2c.address(id, addr, i2c.TRANSMITTER)
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i2c.stop(id)
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print("ack: ",zerr)
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--[[
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i2c.write(id, SOFTRESET)
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i2c.stop(id)
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tmr.delay(20*1000)
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i2c.start(id)
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i2c.address(id, addr, i2c.TRANSMITTER)
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i2c.write(id, HUMIDITY)
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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(50*1000)
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r = i2c.read(id,3)
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i2c.stop(id)
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print(string.byte(r))
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print(string.byte(r,2))
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print(string.byte(r,3))
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]]
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