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 ATTINY85 USB Development Board is a great way to jump into microcontroller electronics.
ATtiny85 based microcontroller development board comes with a USB interface. Coding is similar to Arduino, and it uses the familiar Arduino IDE for development. This is a digispark clone.
It has 6 ports with several functions. Depending on the programming (with Arduino IDE) can it have 6 digital I/O, 4 analog inputs or 3 PWM outputs. It can be powered by a USB port or an external power supply of 6-35V DC.