> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# IO Expansion Hat for Raspberry Pi 3/4/400

**Type:** Product page · **SKU:** DFR0828 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/io-expansion-hat-for-raspberry-pi-3-4-400.html ([markdown](https://core-electronics.com.au/io-expansion-hat-for-raspberry-pi-3-4-400.html.md))

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...

## Pricing

- **Price:** $9.10 (inc GST) — $8.27 AUD, exc GST
- **Quantity discounts:** 6+ $7.85 (exc GST) · 12+ $7.53 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 1 today, and up to 21 more in 8–12 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=DFR0828:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/DFR0828:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

#### Introduction

When making [Raspberry Pi](https://core-electronics.com.au/raspberry-pi-4-model-b-4gb.html) 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](https://core-electronics.com.au/raspberry-pi-3-model-b-plus.html) and [Pi 4](https://core-electronics.com.au/raspberry-pi-4-model-b-4gb.html)
- Connect with [Raspberry Pi 400](https://core-electronics.com.au/raspberry-pi-400.html) through [40PIN double-row cable](https://core-electronics.com.au/raspberry-pi-400-ribbon-cable.html)
 
![](https://core-electronics.com.au/media/wysiwyg/product_images/DFR0828-1-desc.jpg)

![](https://core-electronics.com.au/media/wysiwyg/product_images/DFR0828-2-desc.jpg)

#### 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](https://wiki.dfrobot.com/IO_Expansion_Hat_for_Raspberry_Pi_SKU_DFR0828)
 
#### Shipping List

- IO Expansion Hat for Raspberry Pi x1
- 40PIN Gray Double-row Cable Same Direction \*10cm x1
- Copper Column Screw Packet x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/d/f/dfr0828.jpg)