The Digispark is a tiny, Arduino compatible development board using the ATMEL ATtiny85 microcontroller. It has its own USB bootloader and built in USB capability, allowing you to program it with the Arduino SDK and also use it as native USB device. Feature: 1. Power via USB or External Source - 5v or 7-35v (automatic selection) 2. On-board 500ma 5V Regulator 3. Built-in USB (and serial debugging) 4. 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) 5. 8k Flash Memory (about 6k after bootloader) 6. I2C and SPI (vis USI) 7. PWM on 3 pins (more possible with Software PWM) 8. ADC on 4 pins 9. Power LED and Test/Status LED (on Pin0) 10. Size:0.71*1.05in

It has its own USB bootloader and built-in USB functionality, allowing you to program it with the Arduino SDK or use it as a native USB device. 3-pin PWM (more likely to use software PWM). 8k Flash memory (~6k after bootloader); I2C and SPI (see USI). ? Power supply via USB or external power supply -5V or 7-16V (12V or lower recommended) with on-board 500 mA 5V regulator. Digispark is a tiny, Arduino-compatible development board that uses an ATMEL ATtiny85 microcontroller.