The USB Digispark is an Attiny85 based microcontroller development board similar to the Arduino line, only cheaper, smaller, and a bit less powerful.

With a whole host of shields to extend its functionality and the ability to use the familiar Arduino IDE the Digispark is a great way to jump into electronics,

or perfect for when an Arduino is too big or too much.

Features:

1. Support for the Arduino IDE 1.0+ (OSX/Win/Linux).

2. Power via USB or External Source 5V or 7-15V (12V or less recommended, automatic selection).

3. On-board 500mA 5V Regulator.

4. Built-in USB

5. 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)

6. 8k Flash Memory (about 6k after bootloader)

7. I2C and SPI (via USI)

8. PWM on 3 pins (more possible with Software PWM)

9. ADC on 4 pins 10. Power LED and Test/Status LED