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並前往https://hackaday.io/project/162869-pcf8574-gpio-extender-with-arduino-and-nodemcu/details

PCF8574 GPIO Extender - With Arduino and NodeMCU | Details

In this tutorial, I am going to talk about the PCF8574 8-bit GPIO Port Extender. It is one of the many GPIO extenders available in the market.

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