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GreatFET One

The GreatFET One from Great Scott Gadgets is a hacker's best friend! With two USB ports, one host and one peripheral, it can act as a "man in the middle" for USB interfacing. The GreatFET One connects to a host computer and extends the reach of said computer to the outside world. Whether you need an interface to an external chip, a logic analyzer, a debugger, or just a whole lot of pins to bit-bang, the versatile GreatFET One is the tool for you. Hi-Speed USB and a Python API allow GreatFET One to become your custom USB interface to the physical world. With an extensible, open source design, two USB ports and 100 expansion pins, GreatFET One is your essential gadget for hacking, making and reverse engineering.

At the center is a powerful NXP LPC4330 (Cortex M4 @ 204MHz). The ARM Cortex-M4 is a 32-bit core that offers system enhancements such as low power consumption, enhanced debug features, and a high level of support block integration. The ARM Cortex-M4 CPU incorporates a 3-stage pipeline, uses a Harvard architecture with separate local instruction and data buses as well as a third bus for peripherals, and includes an internal prefetch unit that supports speculative branching. The ARM Cortex-M4 supports single-cycle digital signal processing and SIMD instructions. A hardware floating-point processor is integrated in the core.

The I/O pins are rated for 3.3V and with an 80-pin expansion interface (two female headers with two rows of 20 pins) and a bonus row of 20 male pins, attaching add-on boards is a breeze.

GreatFET One ships in an ESD bag with a high-speed USB cable and a wiggler for easy separation of add-on boards. Enclosures and add-on boards are sold separately.

  • 1x GreatFET One Board
  • 1x USB to microB cable
  • 1x Wiggler
  • LPC4330 microcontroller
  • 2MB flash memory
  • Expansion interface of 80 pins (2 female headers with 2 rows of 20 pins)
  • Bonuse row of 20 male pins
  • Programmable digital I/O
  • Unpopulated Cortex Debug Header for JTAG or SWD
  • Serial protocols including SPI, I2C, UART, and JTAG
  • Logic analysis
  • Analog I/O (ADC/DAC)
  • Data acquisition
  • Debugging
  • Versatile USB functions including FaceDancer
  • High-throughput hardware-assisted streaming serial engine
  • Four fabulous LEDs!

GreatFET One Product Help and Resources

Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

3 Programming

Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
See all skill levels


Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

2 Electrical Prototyping

Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
See all skill levels


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