Serial Interface Board For 1602 LCD Display – I2C/SPI

Here is a short description of the I2C/SPI Serial Interface Adapter Board for 1602 LCD Displays (PCF8574 module):

• What it is: A small daughterboard that solder-mounts to the back of a standard 16×2 (or 20×4) character LCD to convert its parallel interface into a two-wire serial interface.

• Key Benefit: Saves microcontroller pins—reduces the required connections to your microcontroller from 6–12 GPIO pins down to just 2 communication pins ($SDA$ and $SCL$).

• Key Features:

  • Onboard Potentiometer: Allows quick adjustment of LCD contrast.

  • Backlight Jumper: Lets you turn the LCD backlight on or off using a physical jumper or software pin control.

  • Configurable Address: Address pads ($A0,A1,A2$) allow changing the I2C address so you can chain multiple displays on the same bus.

• Common Uses: Simplifies wiring when connecting LCD screens to Arduino, ESP32, STM32, and Raspberry Pi projects.