HTU21D problem with I2C

[ashish.talaviya]

First, Run it on Arduino. If it is ok, then convert that code according your MCU.

[ScruffR]

@legoguy has already done that and reported success further up in this thread

I used the same exact code as the .ino contained in the HTU21D library available in Particle Build: #include "HTU21D/HTU21D.h" HTU21D htu = HTU21D(); void setup() { Serial.begin(9600); Serial.println("HTU21D test"); while(! htu.begin()){ Serial.println("HTU21D not found"); delay(1000); } Serial.println("HTU21D OK"); } void loop() { Serial.println("==================="); Serial.print("Hum:"); Serial.println(htu.readHumidity()); Serial.print("Temp:"); Serial.println(htu.…

[ScruffR]

@johnyrobot5 has already mentioned that it works on Arduino.

That’s the whole puzzle:

• It’s not the hardware (HTU21D breakout board, Particle device)
• It’s not the software (system firmware, application code)
• What can it be? The wiring? The combination with the power shield (I guess this was checked already)?