Interfacing 8 LCD Displays to Microcontroller with Only Two Wires
If you have electronics project that need many LCD display with limited MCU IO pin out, you can use this method to accomplish it. Jesus Echavarria has successfully interface 8 LCD displays and 24 Leds with only two wires: SDA and SCL from an I2C bus. The project uses MCP23017 (16-Bit I/O Expander with Serial Interface) to interface a 2×16 LCD display with AT89C51RE2 microcontroller using a standard I2C bus. In simple words, MCP23017 is like LCD parallel to I2C LCD converter.
The project’s firmware is written in C and is compiled with Keil C51 compiler. With little modification in source code, you implement this method to other MCU like Arduino or PIC.
