I2cScreenScanner.cpp

void scanScreenAddress() {
  Wire.begin();
  Serial.begin(4800);
  while (!Serial)
    ;  // Needed for some cards, No problem for Nano

  Serial.println("Scanning I2C devices...");

  byte count = 0;
  for (byte addr = 1; addr < 127; addr++) {
    Wire.beginTransmission(addr);
    if (Wire.endTransmission() == 0) {
      Serial.print("Device found: 0x");
      Serial.println(addr, HEX);
      count++;
    }
  }

  if (count == 0) {
    Serial.println("No I2C device found.");
  } else {
    Serial.println("Scan has been finished.");
  }
}