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Incroyable après deux jours non stop pas moyen de faire fonctionner le module HTU21D de mesure d'humidité

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This commit is contained in:
Christian Zufferey
2019-12-15 22:42:26 +01:00
parent cff00d2d67
commit ca0029ecb0
2 changed files with 79 additions and 13 deletions
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42
Mesures/humidity/bolo/0_get_data.lua
View File

@@ -1,11 +1,12 @@
-- Lit le capteur I2C HTU21D de mesure d'humidité et de température
print("\n 0_get_data.lua zf191215.1758 \n")
print("\n 0_get_data.lua zf191215.2057 \n")
-- https://cdn-shop.adafruit.com/datasheets/1899_HTU21D.pdf
-- Comparaison DHT22, AM2302, AM2320, AM2321, SHT71, HTU21D, Si7021, BME280
-- http://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html
-- Il est compatible avec le capteur SI7021 mais pas avec la lib SI7021 du NodeMCU Lua :-(
-- http://electromag1.wifeo.com/capteurs-de-temperature-et-humidite-gy-21-et-si7021.php
-- source: https://github.com/famzah/nodemcu/tree/master/HTU21D-TLS
-- source2: https://github.com/tebben/NodeMCU
-- source3: https://github.com/codywon/NodeMCU-2
@@ -15,7 +16,7 @@ id = 0
sda = 1
scl = 2
addr = 0x40
HUMIDITY = 0xE3
HUMIDITY = 0xE5
TEMPERATURE = 0xE3
SOFTRESET = 0xFE
@@ -23,23 +24,40 @@ trig = 4
gpio.mode(trig, gpio.OUTPUT)
gpio.write(trig, gpio.HIGH)
i2c.setup(id, sda, scl, i2c.FAST)
i2c.setup(id, sda, scl, i2c.SLOW)
i2c.start(id)
tmr.delay(1*1000)
i2c.address(id, addr, i2c.TRANSMITTER)
i2c.write(id, SOFTRESET)
tmr.delay(20*1000)
i2c.address(id, addr, i2c.TRANSMITTER)
i2c.write(id, HUMIDITY)
--print("ack: ",zerr)
i2c.address(id, addr, i2c.RECEIVER)
tmr.delay(50*1000)
gpio.write(trig, gpio.LOW)
tmr.delay(0.1*1000)
gpio.write(trig, gpio.HIGH)
r = i2c.read(id,3)
print(string.byte(r))
print(string.byte(r,2))
print(string.byte(r,3))
--i2c.address(id, addr, i2c.RECEIVER)
--[[
i2c.stop(id)
tmr.delay(17*1000)
gpio.write(trig, gpio.LOW)
tmr.delay(1*1000)
gpio.write(trig, gpio.HIGH)
i2c.start(id)
r = i2c.read(id,3)
@@ -48,7 +66,7 @@ i2c.stop(id)
print(string.byte(r))
print(string.byte(r,2))
print(string.byte(r,3))
]]
tmr.delay(1*1000)
i2c.stop(id)

50
Mesures/humidity/bolo/a.lua
View File

@@ -1,3 +1,51 @@
print("\n a.lua zf191215.2112 \n")
t2 = 1234
trig = 4
gpio.mode(trig, gpio.OUTPUT)
gpio.write(trig, gpio.LOW)
gpio.write(trig, gpio.HIGH)
id = 0
sda = 1
scl = 2
addr = 0x40
r = ""
HUMIDITY = 0xE5
TEMPERATURE = 0xE3
function readHumi()
i2c.start(id)
i2c.address(id, addr, i2c.TRANSMITTER)
i2c.write(id, HUMIDITY)
i2c.stop(id)
i2c.start(id)
i2c.address(id, addr, i2c.RECEIVER)
tmr.delay(20000)
gpio.write(trig, gpio.LOW)
tmr.delay(10)
gpio.write(trig, gpio.HIGH)
r = i2c.read(id,3)
i2c.stop(id)
print(r)
return (bit.band((bit.lshift(string.byte(r,1),8)+string.byte(r,2)),0xfffc)*12500)/65536-600
end
function getHumidity()
return tonumber(string.format("%.1f", tostring(readHumi()/100)))
end
tmr.delay(15000)
i2c.setup(id, sda, scl, i2c.SLOW)
tmr.delay(15000)
t2 = getHumidity()
print("Humidity: "..t2.." %")