# 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.

## 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)