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PCF8574 I2C GPIO Expander Tutorial
Getting familiar with using the PCF8574 GPIO Expander with Arduino, including using it as outputs, inputs (polled and interrupt driven), addressing multiple devices on the same bus, and limitations on using this device. Related: I2C bus expander https://youtu.be/FgCYcOrQnho For when you have multiple devices with the same address or you want to ...
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