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Add Digital I/O Pins to Raspberry Pi Hardware Using MCP23017 - MATLAB & Simulink Example
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How To Use A MCP23017 I2C Port Expander With The Raspberry Pi - Part 1 - Raspberry Pi Spy
I2C: MCP23008 & MCP23017 | Wiring Pi
Connecting a mcp23017 to your Raspberry Pi | Pi bits
ModMyPi MCP23017 pHAT - 16 Channel I/O Expansion (Zero)
