MCP23017 Serial Interface Module IIC I2C SPI Bidirectional 16-Bit I/O Expander Pins 10Mhz Serial Interface Module

The MCP23017 is a 16-bit I/O expander that extends microcontroller capabilities through serial communication protocols. This module supports both I2C and SPI interfaces, enabling bidirectional control of up to 16 GPIO pins with a 10MHz serial clock speed. Ideal for embedded systems requiring additional digital I/O without consuming microcontroller pins, it features configurable interrupt outputs and flexible addressing options. Perfect for industrial automation, IoT applications, and complex control systems where pin expansion is essential.

  IO Expander Bidirectional MCP23017

I/O ports play a significant role in microcontrollers' functionality as it is the gateway for devices to be operated, as well as to read data from sensors. A microcontroller has a limited number of I/O pins, but there is a way to get more of these pins for a larger project.

This MCP23017 chip is an I/O expander that could add 16 I/O pins to your microcontroller. You can set each pin as an input or output, or an input pullup. You can even get an interrupt via an external pin when any of the inputs change so you don't have to keep polling the chip.

This chip requires 3V to 5V power supply. The I/O pins can drive up to 20mA, making it work well with LEDs and other components. It could be integrated into your MCU using the I2C interface. Eight of this chip could work together using a single bus as the I2C address of this chip could be modified by tying up the ADDR0-2 pins to ground. You could also integrate this module using the SPI interface.

It is compatible with Arduino boards, as well as Raspberry Pi microcomputers, and can suitable for projects that require a lot of I/O pins.

Easy to use module to expand the I/O interface for both Raspberry Pi and Arduino. IO Expander Bidirectional MCP23017 supports Python library which makes the usage very comfortable and easy. The MCP23017 chip supports the I2C interface which could be used by the Raspberry Pi for communication.

Adafruit developed a Python library which could be used together with MCP23017 chip. This library makes it very easy to use the additional I/O ports from the MCP23017. This library makes the MCP23017 chip soldered on a small break out board with the 16 in/out pins ideal for the usage in small do it yourself projects.