Arduino is "an open-source electronics platform based on easy-to-use hardware and software. It's intended for anyone making interactive projects."

Arduino can be used for inimaginable things. The video on the left show how to transform a lamp into a robot, it also uses processing.

The video on the right uses Arduino to control the lights via bluetooth to drive a stepper motor. The stepper motor controls the movements of the lights remotely from Processing.

Fritzing is an open-source hardware initiative that makes electronics accessible as a creative material for anyone. We offer a software tool, a community website and services in the spirit of Processing and Arduino, fostering a creative ecosystem that allows users to document their prototypes, share them with others, teach electronics in a classroom, and layout and manufacture professional pcbs.

The Uno is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button.

Blink

Led_LDR

Servo