Digispark is an ATtiny85 based microcontroller development board come with USB interface. Coding is similar to Arduino, and it use the familiar Arduino IDE for development. My digispark will be powered by USB only. Digispark is fully compatible with arduino.
Specification:
-Support for the Arduino IDE 1.0+ (OSX/Win/Linux)
-Power via USB -6 I/O Pins (2 are used for USB)
-6K Flash Memory after upload bootloader
-I2C and SPI -PWM on 3 pins (more possible with Software PWM)
-ADC on 4 pins”

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