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7:22
YouTube
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How to Use PCF8574 GPIO Extender With Arduino or ESP32
If you require more pins for your project to connect more buttons, sensors or LEDs, GPIO expanders can help. Essentially, these expanders offer additional GPIOs when your board doesn't provide enough pins. In this tutorial we will learn how to use PCF8574 I2C GPIO Expander with Arduino UNO or ESP32 Download Project files, Wiring and Full ...
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