The attiny85 based mini development board is similar to the arduino, but cheaper and smaller (of course a bit less powerful). With a whole host of shields to extend its functionality and the ability to use the familiar arduino ide, this board is a great way to jump into microcontroller electronics. Applications: Support for the arduino ide 1. 0+ (osx/win/linux). Power via USB or external source – 5v or 7-16v (automatic selection). On-board 150ma 5v regulator. Built-in USB (and serial debugging). 6 i/o pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB) 8k flash memory (about 6k after boot loader) i2c and spi (via usi) pwm on 3 pins (more possible with software pwm) aDC on 4 pins power LED and test/status LED.