Activity Forums Questions & Troubleshooting I2C communication problem Reply To: I2C communication problem

  • Johi

    July 15, 2021 at 7:47 pm

    Hello Louis_kortel,

    In order to help you, i did the following:

    I modified the I2C scanner and I downloaded it to my maxi-power.

    Then i measured the voltage with my Fluke 117.

    I saw varying voltages (around 3V) comming out of the pins SDA and SCL.

    I would suggest you try the same and see if there is life on these pins.

    If not i think your device might be broken.

    #include <Wire.h>

    void setup()


    Serial.begin (9600);

    } // end of setup

    void loop()


    Serial.println ();

    Serial.println (“I2C scanner. Scanning …”);

    byte count = 0;


    for (byte i = 8; i < 120; i++)


    Wire.beginTransmission (i);

    if (Wire.endTransmission () == 0)


    Serial.print (“Found address: “);

    Serial.print (i, DEC);

    Serial.print (” (0x”);

    Serial.print (i, HEX);

    Serial.println (“)”);


    delay (100); // maybe unneeded?

    } // end of good response

    } // end of for loop

    Serial.println (“Done, restarting.”);

    Serial.print (“Found “);

    Serial.print (count, DEC);

    Serial.println (” device(s).”);


    Good Luck,