> **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

# GreatFET One

**Type:** Product page · **SKU:** GSG-GREATFET-ONE · **Brand:** [Great Scott Gadgets](https://core-electronics.com.au/brands/great-scott-gadgets-australia)
**Page:** https://core-electronics.com.au/great-scott-gadgets-greatfet-one-universal-usb-peripheral.html ([markdown](https://core-electronics.com.au/great-scott-gadgets-greatfet-one-universal-usb-peripheral.html.md))

Open-source USB development board for hardware debugging and embedded systems, with logic-level GPIO, protocol sniffing and scriptable peripheral emulation.

> ⚠ Deal is for shelf stock only — any additional stock will be at the normal price.

## Pricing

- **Price:** $131.71 (inc GST) — $119.74 AUD, exc GST

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 9 today; more stock is typically available with a 7–14 day lead time.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=GSG-GREATFET-ONE: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.
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- **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

GreatFET One is an open source, high-speed USB interface board designed to be a custom USB peripheral, logic analyser, debugger and general-purpose I/O expander. It pairs a high-performance ARM microcontroller with two USB ports and a flexible 100-pin expansion area so you can attach "neighbour" add-on boards or wire directly into projects.

Use cases include USB protocol experimentation and man-in-the-middle proxying, multi-protocol chip interfacing (SPI, I2C, UART, JTAG), high-throughput streaming serial, logic analysis and simple analogue data acquisition. The board ships ready for development with a Python-friendly API and documentation to get you started quickly.

### Technical Specifications

 | Product name | GreatFET One (a.k.a. Azalea) |
|---|---|
| Manufacturer | Great Scott Gadgets |
| Microcontroller | NXP LPC4330 (ARM Cortex-M4 core, 204 MHz). |
| Flash / Memory | 2 MBytes flash |
| USB | Two USB ports: one host and one peripheral (Hi-Speed USB). Suitable for man-in-the-middle USB tasks. |
| Expansion / headers | 100 expansion pins total: expansion interface made from two female headers (2 x 20 pins each) plus a bonus row of 20 male pins (80 pin female + 20 male = 100). I/O pins are 3.3 V rated. |
| Protocols and features | Programmable digital I/O; SPI, I2C, UART, JTAG; logic analysis; analogue I/O (ADC/DAC); high-throughput streaming serial engine; FaceDancer support. |
| I/O voltage | 3.3 V signalling on I/O pins. |
| Dimensions | 101.6 mm x 101.6 mm x 7.6 mm (4" x 4" x 0.3"). |
| Box contents (shipped) | GreatFET One board, ESD bag, high-speed USB (micro B) cable, and a Wiggler removal tool. Enclosures and neighbours sold separately. |
| Open source | Hardware design files and firmware are open source; official documentation is hosted in the GreatFET manual and project repositories. |

### Compatibility

 | Interface | Notes |
|---|---|
| SPI | Supported for device and peripheral chip interfacing. |
| I2C | Master and slave style interactions supported for sensors and peripherals. |
| UART / Serial | Multiple serial interfaces and high-throughput streaming serial engine. |
| JTAG / SWD | Unpopulated Cortex debug header provided for external debug connections. |
| USB host / peripheral | Dual USB ports allow host and device roles, enabling USB proxying and Facedancer-style USB experiments. |
| ADC / DAC | Analogue I/O available for simple data acquisition tasks. |
| GreatFET neighbours | Stackable add-on boards ("neighbours") expand RF, GPIO, prototyping and other functions (sold separately). |

### Additional Resources

- [GreatFET manual on Read the Docs](https://greatfet.readthedocs.io) — official user and developer documentation.
- [GreatFET hardware and firmware repositories on GitHub](https://github.com/greatscottgadgets/greatfet) — hardware design files and source.
- [GreatFET tutorials](https://greatscottgadgets.github.io/greatfet-tutorials/) — step-by-step examples and projects.
- [FaceDancer on GitHub](https://github.com/usb-tools/facedancer) — used for advanced USB peripheral emulation.
 
### What's Included

- GreatFET One board
- High-speed USB micro B cable for host/peripheral connection
- Wiggler tool to assist safe neighbour removal

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/g/s/gsg-greatfet-one-showcase.jpg)