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How to connect the MCP23017 GPIO Expander to an Arduino and Raspberry Pi
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Watch all 48 relays turn on and off one by one in this short demo! This setup uses MCP23017 I2C GPIO expanders and can support up to 128 outputs, showing how you can control lots of devices using just a few Arduino pins. Perfect for automation projects, smart home setups, or large Arduino systems.
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Shop china mcp23017 i2c gpio expander

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