Yeah ! cela fonctionne enfin. En fait cela ne fonctionne QUE avec certaines pines du NodeMCU. A creuser maintenant pourquoi ?

Mesures/humidity/bolo/0_get_data.lua

@@ -1,5 +1,5 @@
 -- Lit le capteur I2C HTU21D de mesure d'humidité et de température
-print("\n 0_get_data.lua zf191215.2057 \n")
+print("\n 0_get_data.lua zf191216.1205 \n")
 
 -- https://cdn-shop.adafruit.com/datasheets/1899_HTU21D.pdf
 -- Comparaison DHT22, AM2302, AM2320, AM2321, SHT71, HTU21D, Si7021, BME280
@@ -13,37 +13,26 @@ print("\n 0_get_data.lua zf191215.2057 \n")
 
 
 id = 0
-sda = 1
-scl = 2
+sda = 5
+scl = 6
 addr = 0x40
 HUMIDITY = 0xE5
 TEMPERATURE = 0xE3
-SOFTRESET = 0xFE
-
-trig = 4
-gpio.mode(trig, gpio.OUTPUT)
-gpio.write(trig, gpio.HIGH)
-
 
 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)
+i2c.stop(id)
+
+i2c.start(id)
 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)
+i2c.stop(id)
+
 print(string.byte(r))
 print(string.byte(r,2))
 print(string.byte(r,3))
@@ -68,5 +57,3 @@ print(string.byte(r,2))
 print(string.byte(r,3))
 ]]
 
-tmr.delay(1*1000)
-i2c.stop(id)

Mesures/humidity/bolo/a.lua

@@ -1,15 +1,10 @@
-print("\n a.lua zf191215.2112 \n")
+print("\n a.lua zf191216.1206 \n")
 
 t2 = 1234
 
-trig = 4
-gpio.mode(trig, gpio.OUTPUT)
-gpio.write(trig, gpio.HIGH)
-
-
 id = 0
-sda = 1
-scl = 2
+sda = 5
+scl = 6
 addr = 0x40
 
 r = ""
@@ -22,16 +17,14 @@ function readHumi()
     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
@@ -41,9 +34,7 @@ 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.." %")

Mesures/humidity/bolo/b.lua

@@ -0,0 +1,21 @@
+-- http://www.esp8266.com/viewtopic.php?f=19&t=771
+-- Scan for I2C devices
+
+print("\n b.lua zf191216.1158 \n")
+
+id=0
+sda=5
+scl=6
+
+-- initialize i2c, set pin1 as sda, set pin0 as scl
+
+print("start...")
+i2c.setup(id,sda,scl,i2c.SLOW)
+
+for i=0,127 do
+  i2c.start(id)
+  resCode = i2c.address(id, i, i2c.TRANSMITTER)
+  i2c.stop(id)
+  if resCode == true then print("We have a device on address 0x" .. string.format("%02x", i) .. " (" .. i ..")") end
+end
+print("stop...")