Jesus Echavarria tipped us off about his latest project of controlling multiple HD44780 LCD displays through an I2C interface. He used Microchip’s MCP23017 I/O port expanders and successfully drove eight LCDs with only two microcontroller pins. The MCP23017 device provides 16-bit, general purpose parallel I/O expansion for I2C bus. Upto 8 such devices can be [...]![]()
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