# GreatFET One (Great Scott Gadgets)

> Connect Python tools to digital buses, GPIO and custom USB experiments.

- **Category:** Instruments
- **Availability:** Listed by maker
- **Price:** €90 board / €115 with shield (at lab401.com), checked 2026-09-15
- **Good for:** Connect Python tools to digital buses, GPIO and custom USB experiments.
- **You'll need:** Host software, USB cable, test leads and any required neighbor board.
- **Trade-off:** Expansion boards and enclosure are sold separately.
- **Page:** https://gadgets.sh/devices/greatfet-one/

## Where to buy

| Shop | Status | Link |
|---|---|---|
| Great Scott Gadgets | Orderable | https://greatscottgadgets.com/greatfet/one/?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=greatfet-one&utm_content=api |
| Lab401 | Orderable | https://lab401.com/products/greatfet?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=greatfet-one&utm_content=api |

## Blueprint

**Open hardware.** GreatFET One's full KiCad schematic/PCB and an acrylic-case SVG are published under BSD-3-Clause; a community pinout site documents the header.

### Design files

- schematic: [Azalea (GreatFET One) schematic](https://github.com/greatfet-hardware/azalea/blob/master/azalea.sch) (Eagle/KiCad)
- pcb: [Azalea PCB layout](https://github.com/greatfet-hardware/azalea/blob/master/azalea.kicad_pcb) (KiCad)
- enclosure: [Acrylic case outline (SVG)](https://github.com/greatfet-hardware/azalea/blob/master/azalea_acrylic_case.svg) (SVG)
- pinout: [GreatFET pinout reference](https://gf-pinout.greatscottgadgets.com/) (HTML)

### Source repositories

- [greatfet-hardware/azalea](https://github.com/greatfet-hardware/azalea) — hardware, BSD-3-Clause, ★98

### Key parts

| Part | Role | Datasheet |
|---|---|---|
| NXP LPC4330FBD144 | MCU (dual-core Cortex-M4/M0) | https://www.nxp.com/part/LPC4330FBD144 |

_Notes:_ Verified repo (BSD-3-Clause, 98 stars) and file tree via `gh api`; confirmed LPC4330FBD144 by grepping raw azalea.sch content for the part number. azalea.kicad_pcb/azalea.sch note: repo also has an azalea.kicad_pro but no kicad_sch, i.e. schematic is Eagle-format .sch, PCB layout is KiCad.

## Specifications

### Board & interfaces

| | |
|---|---|
| Design | Azalea / GreatFET One; LPC4330 MCU and 2 MB flash |
| Expansion | J1/J2: 80 pins; J7 bonus row: 20 pins |
| Host USB | USB0 high-speed connection to the computer |
| Target USB | USB1 full-speed port with host/device power switching |
| Digital tools | GPIO, SPI, I²C, UART, JTAG and logic capture |
| Analog | ADC/DAC access through the Python API |
| Controls | Four LEDs, DFU and reset buttons |
| Hardware debug | J5 Cortex JTAG/SWD header footprint is unpopulated |

### Electrical setup

| | |
|---|---|
| I/O voltage | Expansion signals use 3.3 V except pins explicitly noted otherwise |
| Neighbor power | Onboard 3.3 V regulator can supply some neighbor power |
| Pin mapping | Use the Azalea header tables or interactive pinout for each function |
| ADC/DAC pin | Default analog interface is J2 pin 5; DAC is 10-bit |
| Required connections | Connect the host to USB0; use leads appropriate to target pins |

### Software & package

| | |
|---|---|
| Host runtime | Python 3.9 or later, per current getting-started guide |
| Install | Python package: greatfet; Linux access rules documented |
| Check connection | greatfet info reports detected board and firmware |
| Update pairing | Upgrade host tools, then use the documented firmware autoflash step |
| Logic capture example | Documented four-channel 2 MSPS capture to a Sigrok file; not a maximum rating |
| API discovery | greatfet info -A lists APIs provided by installed firmware |
| Included | USB cable, ESD bag and neighbor-separation tool |
| Separate accessories | Neighbor boards and enclosure are sold separately |
| Recovery | ROM USB bootloader supports firmware loading without an external programmer |

## Firmware & community

- [GreatFET Host Software](https://github.com/greatscottgadgets/greatfet) — Hardware hacking and reverse engineering toolkit with Python API for SPI, I2C, JTAG, and logic analysis.

## Documentation

- [GreatFET One product and package](https://greatscottgadgets.com/greatfet/one/)
- [Azalea hardware, electrical notes and header tables](https://github.com/greatfet-hardware/azalea)
- [Interactive GreatFET One pinout](https://gf-pinout.greatscottgadgets.com/)
- [Azalea KiCad schematic source](https://github.com/greatfet-hardware/azalea/blob/master/azalea.sch)
- [GreatFET host installation and firmware update](https://greatfet.readthedocs.io/en/latest/getting_started.html)
- [GreatFET API, logic capture and analog examples](https://greatfet.readthedocs.io/en/latest/using_greatfet_apis.html)

---
Source: gadgets.sh · https://gadgets.sh/devices/greatfet-one/ · JSON: https://gadgets.sh/api/v1/devices/greatfet-one.json