IO Expansion Hat for Raspberry Pi 3/4/400

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When making Raspberry Pi projects or learning to use Raspberry Pi for python programming, we may often need to check its Pinout Table to find out the BCM and WiringPi code corresponding to the related GPIOs, which is time-consuming and inefficient. Now in order to solve this problem, we designed a Raspberry Pi expansion hat with detailed Pinout information.

This IO expansion hat, specially developed for Raspberry Pi, is perfectly compatible with Pi 3, Pi 4, and Pi 400. All IO ports of Raspberry Pi are led out one by one. Most importantly, the hat provides 40PIN comparison silkscreens that contain detailed BCM code and WPI code information, which saves the trouble of frequently checking pin comparison table when programming with Pi.

There are two ways to use the expansion board:

  • Directly plug in Raspberry Pi 3 and Pi 4
  • Connect with Raspberry Pi 400 through 40PIN double-row cable

  • Features
  • Complete and detailed pin comparison silkscreen
  • Compatible with Pi 3, Pi 4, Pi 400
  • Anti-reverse plug-in horn socket design and dedicated 40PIN double-row cable

  • Specification
  • IO Port Working Voltage: 3.3V
  • Module Size: 65*65 (mm) / 2.56*2.56 inch

  • Documents
  • Product wiki

  • Shipping List
  • IO Expansion Hat for Raspberry Pi x1
  • 40PIN Gray Double-row Cable Same Direction *10cm x1
  • Copper Column Screw Packet x1
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    Buy with Confidence

    We're Australia's only Raspberry Pi approved reseller in Sydney, Australia.

    Meet the Pi Powered Robot that ships other Pis

    This is our secret to shipping the IO Expansion Hat for Raspberry Pi 3/4/400 out so fast to you!


    How do you Ship your Raspberry Pis?

    We ship via Australia Post eParcel from our Sydney warehouse.

    Australia Post picks up from us daily.

    Asll shipping methods we use have tracking.

    Do you ship from Sydney, Australia?

    All our products ship from our warehouse in Sydney, Australia.

    What payment methods do you accept?

    We accept all major credit cards, Apple Pay, Google Pay and PayPal.

    We also accept purchase orders from educational and government institutions on 30-day terms.

    You're automatically approved if you're a school, university, or state or federal government department or agency.

    What is your return, exchange and warranty policy?


    We accept returns for faulty products, but will first work with you to help get your Raspberry Pi working again.

    99% of the time there it is not the Raspberry Pi that is faulty.

    If you need help, reach out to us on

    Change of Mind

    We are happy to accept a return for a "change of mind", however, you will need to cover the cost of any merchant fees associated with the return. Goods need to be in an "as new" state.

    What's the warranty on your Raspberry Pis?

    You can have peace of mind knowing that Raspberry Pi is backed by a 1-year warranty, and thanks to rigorous quality assurance testing in the UK factory, you can be sure that your Raspberry Pi will stay in good working condition.

    How long does shipping and delivery take?

    At our Sydney, Australia warehouse, we provide fast and reliable shipping. To go even further, we have created our own Raspberry Pi powered Robot called Bishop.

    How long does delivery take?

    Australia Post picks up from us daily. If you're within the Australia Post next day network you can usually expect your order to arrive the next day if ordered with Express Post before 2pm.

    80% of Australian addresses covered and you probably already know if you're in the network.

    How can I track my order?

    When we ship your order (which we do daily), we send you a tracking link.

    If you haven't received a tracking link, please email us on .

    How do I contact customer service?

    You can call us on 1300 240 817 or email .

    Do you have a secure website?

    Yes, our website is secure and we use the latest security features to ensure your data is always kept safe.

    Can I get my order shipped to a PO Box or Parcel Locker?

    If you want to ship to a PO Box, Parcel Locker or another otherwise anonymising delivery address, we need you to use Paypal at checkout.