The title of the smallest Arduino board doesn't go to just a single board — it actually belongs to an entire family: the Nano family. This set of boards comes in the smallest form factor Arduino ...

But it's possible to go even smaller, as the makers of a new Arduino-compatible product called "Microduino" show. At 1" × 1.1", it's nearly as small as a quarter.

Even a very small one with low memory and few pins available! The 1.14” display has 240×135 16-bit full color pixels and is an IPS display, so the color looks great up to 80 degrees off axis in ...

Just how small is the Micro? It measures in at 1.9-inches x 0.7-inches (48mm x 18mm). The board is based on the ATmega32u4, and has a built-in USB.

A 1.8 inch TFT display is used, the cable to the screen is necessarily soldered. Without soldering a lot of distortion as the length of the cable from the Arduino to the TFT screen is 1.1 meters!

All Arduino-compatible boards and extension modules created by Microduino are about the size of a quarter and stackable, which makes it easy to build micro-robotics and other small projects.

I'm a big fan of the Teensy, which is both a lot smaller than standard Arduino and (in the current version) a lot more powerful and easy to program. Not quite this small. But it retains USB ...