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Hobbybotics PCF8574A I2C I/O Expander V1.0

The Hobbybotics I2C I/O Expander is based on the Philips PCF8574 or PCF8574A.  The PCF8574A provides eight bits of I/O with the use of only two pins on the Hobbyduino or equivalent micro-controller.  Included are pictures of the first version of the PCB.

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