GreatFET One
Open-source USB development board for hardware debugging and embedded systems, with logic-level GPIO, protocol sniffing and scriptable peripheral emulation.
In stock, ships same business day if ordered before 2PM
Delivered by Tue, 23rd of Sep
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 — official user and developer documentation.
- GreatFET hardware and firmware repositories on GitHub — hardware design files and source.
- GreatFET tutorials — step-by-step examples and projects.
- FaceDancer on GitHub — 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
This product is listed in:
Gizmos & GadgetsTest Equipment>Logic Analysers
Home Lab>Work Bench
Prototyping>Advanced Prototyping
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Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).
We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):
- $3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
- $7+ for Standard Post (typically 6+ business days, tracked)
- $11+ for Express Post (typically 2+ business days, tracked)
- Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.
Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.
Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.
International Orders - the following rates are for New Zealand and will vary for other countries:
- $12+ for Pack and Track (3+ days, tracked)
- $16+ for Express International (2-5 days, tracked)
If you order lots of gear, the postage amount will increase based on the weight of your order.
Our physical address (here's a PDF which includes other key business details):
40 Aruma Place
Cardiff
NSW, 2285
Australia
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.
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