£16.99 each (including VAT: £20.39)

The IO Pi is a 32 channel digital expansion board designed for use on the Raspberry Pi computer platform. The board is based around the MCP23017 16-bit I/O expander from Microchip Technology Inc. A pair of MCP23017 expanders are included on the board allowing you to
connect up to 32 digital inputs or outputs to the Raspberry Pi.  The IO Pi Expander is powered through the host Raspberry Pi using the GPIO port and extended pins on the GPIO connector allow you to stack the IO Pi along with other expansion boards.

The IO Pi is pin compatible with the the Raspberry Pi model B+.


The I2C address bits are selectable using the on-board jumpers. The MCP23017 supports up to 8 different I2C addresses so with two MCP23017 devices on each IO Pi you can stack up to 4 IO Pi boards on a single Raspberry Pi giving a maximum of 128 I/O ports.

The IO Pi includes a 5V port that can be isolated from the Raspberry Pi via an isolation jumper so you can use a seperate high current power supply to power the IO Pi reducing the load on the Raspberry Pi. Use of an external supply is recommended if you plan on connecting more than one IO Pi to your Raspberry Pi.


IO Pi Address Configuration and Specification





Input Ratings & Specifications

Maximum input voltage: 5.5V when isolation jumper is removed

Maximum current on each IO pin 25mA

Maximum current on a single I/O Bank (1 MCP23017 device) 125mA


Click to download
Click to download schematic PDF.

Sample Code

We have python libraries available for this expansion board.  You can download all of the libraries from github at:

To download the libraries to your Raspberry Pi type in terminal:

git clone


Python Tutorial 1 - The Blinking LED

Find out how to connect LEDs to the IO Pi and how to control them.

Product Code: IOPI

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