Arduino Digital Input Expander

MCP23017 GPIO Expander Demo PCB: Arduino Uno Relay Driver

PCBWay Supports High Precision Advanced PCBs: https://www.pcbway.com/ Here's how to get the MCP23017 GPIO expander up and running over I2C with Arduino. This project shows how to get the expander configured with the Adafruit library, and how to access the 16 GPIO for read and write access. The project can be made on a breadboard, but this pcb ...

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