FEZ (Fast and Easy!)

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FEZ is a powerful, user friendly, maker focused IoT board. This is not just another maker-board, the combination of its low-cost, beefy 32bit processor, Secure Wifi option, and the long list of supported software options, it is the rule-them-all board. (FEZ without wifi pictured) and FEZ with wifi $9.95 (MSRP) and $24.95 (MSRP) respectively. There are no additional licensing fees or other fees and all of the GHI Electronics development tools are provided free of charge. (FEZ without wifi pictured) and FEZ with wifi $9.95 and $24.95 respectively.

  • STM32F401
  • 512KB FLASH
  • 64KB RAM
  • 20 IOs
  • 6 PWM
  • High level features

FEZ The Rule Them All Board

(picture of FEZ in retail packaging)

Flexible Software Options

FEZ works with several third party tools, like Arduino®, mbed®, MicroPython, Keil, GCC, FreeRTOS. The very popular STM32F401 microcontroller utilized on FEZ opens the door to almost every single maker and commercial platform. It is even fully supported with our TinyCLR OS.

Flexible Software Options

TinyCLR OS, for the .NET Developers

FEZ is completely supported to work with Visual Studio and be programmed in .NET, C# and Visual Basic. Full debugging capabilities (pause, step, inspect variables…) are standard with TinyCLR OS. All that magically works over a USB cable. No need to add any additional hardware.

Microsoft .Net

Arduino-pin Compatible

TinyCLR OS - Hardware Options

The footprint and pinout of FEZ is made to be Arduino Compatible. This allows for the use of a wide range of plug-and-play accessories onto the FEZ.

Thanks to TinyCLR OS, these accessories are programmable through a modern language and programming environment.

Expansion Options

With thousands of sensors and control modules that can be used with any Arduino-pinout compatible board such as the official TinyCLR OS board - FEZ. We have hand-picked a few accessories available from companies supporting the maker communities.



A 1.8” color display with a joystick and a micro SD connector.



A shield allowing click board to be used with Arduino-pinout compatible boards.



A battery powered sumo robot with reflective sensors, an accelerometer and a gyro.



A kit with several Grove modules and a host shield.



A kit containing Motor controller shield with gearboxes and wheels.

Internet of Things (IoT) Ready


FEZ comes with optional built in WiFi. It utilizes ST Microelectronics' SPWF04 CE/FCC certified WiFi Module.

Of course, we didn't just include the module. TinyCLR OS includes the necessary drivers to make secure WiFi connections available through a .NET-compatible interface.

Product Lifecycle

We understand the importance of products availability and lifecycle.
The Longevity page details our policies Here
Released January 2018


Resource Description
TinyCLR OS enables you to program your embedded device with the same .NET tools you know and love!
Getting Started Getting started information including datasheet.

Place Order

How can we make it so low-cost and not compromise the quality and feature set? Thanks to our own state-of-the-art USA-based manufacturing and over 10-years of engineering experience.

Part Number Description MSRP
FEZ STM32F401, 512KB FLASH, 64KB RAM, 20 IOs, 6 PWM $9.95 per unit
@ 100 qty
FEZ With Wifi STM32F401, 512KB FLASH, 64KB RAM, 20 IOs, 6 PWM $24.95 per unit
@ 100 qty

The History of FEZ!

Did you know that FEZ has been around for a very long time?

Here Is Some History