Microcontroller Boards


The smallest Arduino ever created

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The current range of easy-to-program boards are staggeringly large for the complexity of the designs. As technology continues to advance and new opportunities for sensors and applications arise, why should people be limited to a bulky device? Technology should be able to shrink to meet any opportunity for any use, and that is what the µduino was designed for!

The µduino is the smallest Arduino ever made. Many projects make this claim, but none can compare to the µduino in terms of size or power. Measuring in at 12 mm (0.5 inches) square in the final design, nothing even comes close to this size! While similarly sized micro-controller boards do exist, their power is severely limited to using chips such as the ATtiny85 (with up to 6 I/O ports) or simply removing a number of I/O ports.

The µduino is the smallest Arduino compatible device ever made, at 12mm square!
The µduino is the smallest Arduino compatible device ever made, at 12 mm square!

The µduino makes use of the power of the ATMEGA32U4 chip found in the Arduino Leonardo (a board over 20 times larger), offering 20 I/O ports, including PWM and ADC ports! In addition, the µduino can be powered by batteries or directly by micro-USB. The µduino was specifically designed to operate in two power modes, 3.3 V or 5 V, which can be selected using a jumper on the board. This way, you can tailor your µduino to match your sensors and power supplies without having to worry about multiple versions of the same board!

µduino uses the powerful and versatile ATMEGA32U4 microcontroller.
µduino uses the powerful and versatile ATMEGA32U4 microcontroller.

The µduino is extremely small, but that size opens up immense possibility for projects. Instead of being limited to ATtiny chips (with programmable memory less than 4 KB), the µduino has 28 KB available for programming (4 KB of the 32 KB total is used by the bootloader). This supplies the raw power of a full sized Arduino Leonardo board in the smallest size imaginable.

Unlike many other Arduino-based boards, the µduino uses smaller hole separation (1.27 mm vs 2.54 mm). While vastly cutting down on size, standard sized wires are still compatible and can be soldered or bent in place.

Who Needs It and Why?

The µduino is designed particularly with wearables and small-sized projects in mind. With this focus, the µduino works very well with sensors. Some uses include a mini quad-copter, GPS logging module, small multimeters, heart rate monitors, and much more!

Features & Specifications

µduino detailed pinout.
µduino detailed pinout.


Arduino Uno, Arduino Micro, and µduino.
Arduino Uno, Arduino Micro, and µduino.
SizeMicrocontrollerTotal I/OPWM I/OUSB SupportConnector Spacing
µduino12 mm x 12 mmATMEGA32U420 (6 analog)7 PWMmicro USB Port1.27 mm spacing
Uno69 mm x 54 mmATMEGA328P20 (6 analog)6 PWMUSB-A Port2.54 mm spacing
Micro18 mm x 48 mmATMEGA32U420 (6 analog)7 PWMmicro USB Port2.54 mm spacing
Digispark26 mm x 19 mmATtiny856 (4 analog)3 PWMFull USB Port2.54 mm spacing
Flora45 mm diameterATMEGA32U46 (4 analog)3 PWMmicro USB Portmounting holes
Pico15 mm x 15 mmATMEGA32U48 (3 analog)1 PWMmicro USB Port2.54 mm spacing
Initial prototype (14mm), second prototype (12.5mm), and final design (12mm).
Initial prototype (14 mm), second prototype (12.5 mm), and final design (12 mm).

In the Press

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Produced by µduino in Chelmsford, MA.

Sold and shipped by Crowd Supply.


You will receive your µduino fully assembled and pre-programmed with the Arduino bootloader. Plug it into your USB cable and you're ready to go!

$24 $8 US Shipping / $18 Worldwide

About the Team


Chelmsford, MA

Tiny hardware for your big little projects.

Dave Chadwick
Electrical Engineer

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