i2c_scanner - useful when you are not sure of the i2c address for an i2c device. Works on multiple microcontroller

i2c_scanner.ino

#include <Wire.h>

void setup() {
Serial.begin (115200);
Serial.println ();
Serial.println ("I2C scanner. Scanning ...");
byte count = 0;

Wire.begin();
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 (")");
    count++;
    delay (1);
  } // end of good response
} // end of for loop

Serial.println ("Done.");
Serial.print ("Found ");
Serial.print (count, DEC);
Serial.println (" device(s).");
}

void loop() {}