I2C Serial Interface Module for 16×2/20×4 LCD

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  • Converts 16x2 and 20x4 LCDs to I2C interface

  • Uses only 2 communication lines (SDA & SCL)

  • Based on PCF8574 I/O expander IC

  • Adjustable contrast via onboard potentiometer

  • Backlight control through I2C command

  • Reduces wiring complexity significantly