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Too few pins on your Arduino? Use this I2C controlled pin extender (with optional interrupt) to make life easier - RalphBacon/PCF8574-Pin-Extender-I2C ...
PCF8574_LH Library for Arduino The PCF8574_LH library provides a simple interface for controlling the PCF8574 I/O expander using the I2C communication protocol. It allows you to read and write values ...
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