Gravity: MCP23017 I2C 16 Digital IO Expansion Module

1. Example Code for Arduino-Pin Output

This comprehensive guide provides detailed instructions on setting up and using an Arduino with the MCP23017 IIC module for digital IO expansion. It includes hardware and software preparations, a wiring diagram, sample code for controlling pin output, and expected results, making it an ideal resource for beginners and DIY enthusiasts.

2. Example Code for Arduino-Button Input

This article offers a comprehensive guide on implementing button inputs for Arduino using the DFRobot MCP23017 library. It includes hardware and software preparations, wiring diagrams, and sample code to facilitate the detection and display of button status via the serial port.

3. Example Code for Arduino-IO Interrupt

This article provides an example code for setting up IO interrupts on Arduino using the MCP23017 library, covering hardware and software preparations, wiring diagrams, and demonstrating the interrupt service functions to detect changes and execute actions via serial port.

4. Example Code for Arduino-Interrupt Polling

Set the IO pins of the board to interrupt mode, such as eChangeLevel, eFalling, eRising, eHighLevel, eLowLevel. Set PA0, PA1, PB6, PB7 to eChangeLevel, eFalling, eRising, eHighLevel respectively, poll and serial print the pins where interrupt happened. Set a pin of IO expansion board to interrupt mode, poll if there is an interrupt occurring on the pins of the port. Experiment phenomenon: poll if there is an interrupt occurring on the port group(A, B, A+B), if there is, serial print the pin which is interrupted.