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    Can you explain the "delay(100)" before "Wire.endTransmission()"? You know that the "endTransmission" is actually the start of transmission. Commented Aug 9, 2019 at 9:24
  • Does the evaluation board run on 3.3V? Commented Aug 9, 2019 at 9:37
  • i didn't had understood that the transmission started only after the endTransmission. I have added the delay() because into the I2C scanner i had to add a delay(100) between the beginTransmission and endTransmission or the scanner was blocking at the address tryed Commented Aug 9, 2019 at 9:55
  • @chrisl i tryed with the both alimentation pin of the Uno the 3.3 and the 5V and got the same result Commented Aug 9, 2019 at 10:01
  • But the Uno will try to raise SDA and SCL to 5V, while the evaluation board would only raise it to 3.3V. So there will be a cross current. If you want to connect a 5V and a 3.3V device via I2C, you definitely need a level shifter. Commented Aug 9, 2019 at 10:07