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並前往https://www.instructables.com/Adding-an-MCP23017-IO-Extender-to-Arduino-or-ESP82/

Adding an MCP23017 I/O Extender to Arduino or ESP8266

The MCP23017 is an I2C enabled 16 I/O port chip. That means that you only need 2 pins (yes with Vcc and earth it makes 4) to control the chip and the added ...

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