I2C LCD Address Auto detect

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Nice attempt :+1:

I’d just suggest some alternative solution that doesn’t already instantiate an object that may well become redundant soon after.

How about something like this

const uint8_t addresses[] = { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,   
                              0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f };
LiquidCrystal_I2C *lcd;

void setup() {
  int i;
  Wire.begin();
  for(i = 0; i < sizeof(addresses); i++) {
    Wire.beginTransmission(addresses[i]);
    if (Wire.endTransmission() == 0) {
      lcd = new LiquidCrystal_I2C(addresses[i], numLcdCols, numLcdRows);
      lcd->init();                      // initialise the newly found lcd
      lcd->backlight();
      lcd->clear();
      lcd->print("Hello World!");
      break;
    }
  }
  if (i >= sizeof(addresses)) {
    Log.error("No display found");
  }
}
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