The Arduino Mini is a small microcontroller board intended for use on breadboards and when space is at a premium. The revision 05 has a new package for the ATmega328, which enables all components to be on the top of the board. It also has an on-board reset button. The 05 version has the same pin configuration as revision 04.

Additional features coming with the 05 version are:
- new PCB layout and design
- on-board reset button

The Arduino Mini has 14 digital input/output pins (of which 6 can be used as PWM outputs), 8 analog inputs, and a 16 MHz crystal oscillator. It can be programmed with the USB Serial adapter or other USB or RS232-to-TTL serial adapters.