This tiny and low cost AVR development board is great for compact projects or projects that only requires a few IO pins.
Based on the 8 pin Atmel ATTiny85 processor it allows for an incredibly small form factor.
It also has the advantage of including a micro usb interface that allows the processor to be programmed via a USB power without the need for any download adaptors.
Additionally the board also comes pre-programmed with the Arduino bootloader and test blink sketch.
Please note that to use with the Arduino development environment you will need a modified version of this software.
This development board is based on the DigiStump Digispark reference design and is released under the Creative Commons Attribution-ShareAlike 3.0 License available here:
8K Flash memory
6x Digital pins P0 - P5 (two shared for USB communication)
4x ADC pins (shared with digital pins)
SPI interface (shared with digital pins)
I2C interface (shared with digital pins)
3x PWM outputs (shared with digital pins)
Can be powered via USB, 5V, or VIN (7-12V) inputs
On board 5V 0.5A regulator for external supply
Power LED and user controlled LED
5V......5V out when supplied by USB or Vin / or 5V supply in
VIN.....External supply in (7-12V)
P0......AREF / SDA
P1......PWM / D0
P2......D1 / ADC1 / SCK
P3......D2 / ADC2 / USB
P4......D3 / PWM / ADC3 / USB
P5......D4 / ADC4