Private
Arduino-MCP23017
2023-11-18
Support complet de MCP23017
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MCP23017
This library provides full control over the Microchip's MCP23017, including interrupt support.
Features
- Individual pins read & write
- Ports read & write
- Registers read & write
- Full interrupt support
Usage
Unlike most Arduino library, no default instance is created when the library is included. It's up to you to create one using the appropriate I2C address based on MCP23017 A0, A1 and A2 pins wirings.
Available addresses go from 0x20 to 0x27, allowing up to 8 MCP23017 on the same I2C bus.
#include <Arduino.h>
#include <MCP23017.h>
MCP23017 mcp = MCP23017(0x24);
Additionaly, you can specify the Wire instance to use as a second argument. For instance MCP23017(0x24, Wire1).
See included examples for further usage.
Warning about GPA7 & GPB7
GPA7 or GPB7 should not be used as inputs despite what the configuration registers allow. As stated by Microchip, it can lead to SDA signal corruption or even malfunction in the host bus under some conditions.
Breaking changes in v2.0.0
Major renames have been performed in v2.0.0 to improve compatibility with a variety of platforms. Existing code will break when you update from version v1.x.
| Name in v1.x | Name in v2.x |
|---|---|
MCP23017_PORT |
MCP23017Port |
MCP23017_REGISTER |
MCP23017Register |
MCP23017_INTMODE |
MCP23017InterruptMode |
In addition to this, every member of the MCP23017Register enum were renamed to avoid possible conflicts with macro definitions. GPIOA was renamed to GPIO_A, INTCAPA to INTCAP_A and so on...
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Reviews
5
(1)
user_9OcW5WxD
2025-04-17
I have been using the arduino-mcp23017 library by blemasle and it has exceeded my expectations! The library is well-documented and easy to integrate into my projects, providing seamless control over multiple I/O expanders. The link provided on GitHub (https://github.com/blemasle/arduino-mcp23017) contains all the resources needed to get started. Highly recommend for anyone looking to maximize their Arduino's I/O capabilities!