Gallery – Hobbybotics PCF8574A I2C I/O Expander

The Hobbybotics I2C I/O Expander is based on the Philips PCF8574A.  The PCF8574A provides eight bits of I/O with the use of only two micro-controller pins.  Included are pictures of the first version of the PCB.  Go here and check out the pictures.


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