Trinkets

Adafruit Trinkets are tiny microcontroller boards that are Arduino-IDE programmable and built around the Atmel ATtiny85, a little chip with a lot of power. The Trinket is small enough to fit into any project and low cost to use without hesitation. The Attiny85 has 8K of flash, and 5 I/O pins, including analog inputs and PWM 'analog' outputs. A USB bootloader allows the Trinket to plug into any computer for reprogramming over a USB port, just like an Arduino.