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MSP430 (or Arduino) Library for PCF8574 I2C Port Expander

August 8th, 2014 9 comments

port-expanderI bought an 8-port general purpose IO expander for adding ports to my MSP430 projects via I2C, but I couldn’t find any library for accessing it. Fortunately the I2C communication with the on-board Texas Instruments PCF8574 chip is pretty straightforward, so after studying the LiquidCrystal_I2C library, which uses the PCF8574 for communicating with the popular 16×2 LCDs, I made my own library for this port expander. You are welcome to it. I release it as Public Domain code.

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