empowering creative people

Core Electronics > Retired

Slice of PI/O for Raspberry PI

SKU: 005-K002

$12.23 AUD, inc GST
$11.12 AUD, exc GST

More Views

Slice of PI/O for Raspberry PI

SKU: 005-K002

$12.23 AUD, inc GST
$11.12 AUD, exc GST
2 reviews 0 5 5


  • $6.95 Standard (2-4 days, tracked)
  • $9.95 Express (Overnight*, tracked)
  • $3 Economy Post* (3-7 days, no tracking)
  • FREE Pickup (Newcastle only)

Shipping costs may increase for heavy products or large orders.

Exact shipping can be calculated on the view cart page.

*Conditions apply, see shipping tab below.

This product has been retired and kept here for reference.

So many people had built the MCP23017 onto the slice of PI that we thought you might like a version on a PCB and with lots of extra functions. Special mention should go to Nathan for coming up with the original idea http://nathan.chantrell.net/20120602/raspberry-pi-io-expander-board/

  • Easy to build kit
  • Runs at 3v3 or 5v from the PI (red jumper)
  • Runs off external power (remove red jumper and wire to pad "EXT POWER")
  • 4 wire daisy chain connector (PWR/GND/SCL/SDA)
  • Breakout for Interrupt A & B
  • Daisy chain upto 8 for 128 I/O pins
  • 2 x 8 way 0.1" pitch layout for instant "vero-ability" of all 16 I/O's
  • 2 x 8 way 0.1" pitch common ground for ease of use.
  • 0.1uf decoupling capacitor

Build Guide and documentation can be found here


This product is listed in:

Documentation and Resources:
  • The Maker Revolution
  • The Maker Revolution celebrates the creation of new devices and the modification of existing ones - the transition from a consumer buying goods to eventually having a major part in their creation. The Maker Revolution places strong emphasis on free (...

Product Comments

Customer Reviews

  1. Review by Matt in Brissy - Totally Agree with Echoshack above.

    1+ to the comments from Echoshack.

    Thanks for taking the time to help those with less experience explore the world of the Raspberry Pi GPIO (with safety, and consideration for their equipment).

    You Sir, are a gentleman scholar - that is of course if you are a guy...if you're a gal....then you're a Lady scholar! (Posted on 4/05/2014)

  2. Review by Echoshack - Safety buffer for your Raspberry Pi

    The one issue I have with the Raspberry pi is that it has no buffering of the I/O. It would be very easy for the inexperienced to Zap the processor. The Slice of Pi solves this issue very cheaply and is easy to build. The PCB is of good quality and easy to solder with a fine tip soldering iron. The nylon screw that comes in the kit is to stop the PCB from touching the components on the Pi. I fitted this to the Pi rather that the Slice of Pi, the choice is yours.

    Once built you need to edit some files and install some software........

    Enable i2c by editing the following files

    Comment out the line
    blacklist i2c-bcm2708

    Add a new line

    Installing i2c-tools requires two commands, replace 'your-userid' with your login name (the default is pi)
    $ sudo apt-get install i2c-tools

    $ sudo adduser your-userid i2c

    Once everything is installed and rebooted, you should be able to detect the MCP23017 using the following command.
    $ i2cdetect -y 1 PI rel ‘A’ this was a 0 rep ‘B’ is now a 1

    It should show up on the address you selected

    Here is some old stuff but you do not need to do this each boot as its now part of the OS and you edited some files and have added your-userid to get access.

    You can now save this file with Ctrl+O and pressing enter and exit nano with Ctrl+X. Once you are back at the command prompt reboot your raspberry pi.

    $sudo reboot

    Once the reboot has finished you need to make the ports active by running this command:

    $sudo modprobe i2c-dev

    Now you should be able to see the i2c ports listed in your /dev/ directory

    $ls /dev/i2c* try this

    You should see /dev/i2c-0 and /dev/i2c-1 listed.
    (Posted on 19/04/2013)

Exact shipping can be calculated on the view cart page (no login required).

We deliver Australia-wide with these options:

  • $3 for Small Items (3-7 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $9.95 for Express Post (Overnight for most of Australia, 2+ days for rural, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
NSW, 2289

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

Have a product question? We're here to help!