$2 Arduino. The ATMEGA328 as a stand-alone. Easy, cheap and very small. A complete guide.
Hey finally a use for those SMD Leds I accidently ordered off Aliexpress ;)
How to Grow Salt Crystals!
RF 315/433 MHz Transmitter-receiver Module and Arduino
Crayon Lathe LittleBits
Most Useless Machine - littleBits Edition
My Physical Web Space
Simple Homopolar Electric Motor