The Arduino Pro Mini is a very compact version of the Arduino Nano without an on-board USB to Serial connection.
The Arduino Pro Mini is a small microcontroller board originally based on the ATmega168, but now supplied with the 328.(datasheet), intended for use on breadboards and when space is at a premium. It 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 adapter. The new Mini (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 onboard reset button.
|Input Voltage||7-9 V|
|Digital I/O Pins||14 (of which 6 provide PWM output)|
|Analog Input Pins||8 (of which 4 are broken out onto pins)|
|DC Current per I/O Pin||40 mA|
|Flash Memory||32 KB (of which 2 KB used by bootloader)|
|Clock Speed||16 MHz|