addr: I2C addres of the LCD predefined by the serial extender. Valid values: unsigned byte Default value: none Usual values: 0x3F for LCDs 2004 with 20 columns and 4 rows. 0x27 for LCDs 1602 with 16 ...

After uploading the sketch, open the Arduino Serial Monitor (Tools > Serial Monitor). The sketch will automatically detect the I2C address of the connected LCD module and initialize it. You should see ...

Assume that you are moving towards a complex microcontroller project bundled with blinkers, beepers, and a display panel. To link a standard 16×2 LCD directly with the microcontroller, for instance ...