The GreatFET One from Great Scott Gadgets is a versatile, open-source hardware tool built around the NXP LPC4330 (Cortex-M4 at 204 MHz). With two USB ports — one host and one peripheral — it can act as a man-in-the-middle for USB interfacing, making it an essential tool for hardware hacking, reverse engineering, and custom USB peripheral development.

The board features 100 expansion pins and supports add-on boards called "neighbours" that extend its functionality. A Python API and Hi-Speed USB let you quickly turn the GreatFET One into a custom USB interface to the physical world.

Key Features

• NXP LPC4330 Processor – Cortex-M4 at 204 MHz
• Dual USB Ports – One host, one peripheral for man-in-the-middle USB work
• 100 Expansion Pins – Extensive I/O for custom interfacing
• Python API – Script-driven control over Hi-Speed USB
• Expandable – Add "neighbour" boards for specialised functions
• Open Source – Fully open hardware and software design
• USB Bootloader in ROM – No external programmer needed for firmware installation

Capabilities

• Programmable digital I/O
• Serial protocols: SPI, I2C, UART, and JTAG
• Logic analysis
• Analogue I/O (ADC/DAC)
• Data acquisition
• Hardware debugging
• USB functions including FaceDancer
• Hardware-assisted streaming serial engine

Ideal For

• USB reverse engineering and protocol analysis
• Hardware security research
• Custom USB peripheral development
• Embedded systems debugging and interfacing

Package Contents

• 1× GreatFET One board
• 1× Hi-Speed USB cable
• 1× Wiggler (for separating neighbour boards)

Resources

• Great Scott Gadgets