- The blue preset is to adjust the contrast of the LCD. The black jumper on the left is to enable the Backlight of LCD.
- The I2C device has a HEX address by which a microcontroller can communicate with it.
- This is set by the 3 bits A0,A1 ,A2 .If no jumper is present , it is HIGH & a jumper means LOW. By default all the 3 jumpers are open . ie., A0,A1 A2 all are 1s.
- Modules | LCD Display Module | LCD Interface | Interface Module | I2C GPIO Expander Module.