The Arduino Pro Mini is a microcontroller board based on the ATmega328p. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, an on-board resonator, a reset button, and holes for mounting pin headers. A six pin header can be connected to an USB to serial adapter to provide USB power and communication to the board.

The Arduino Pro Mini is intended for semi-permanent installation in objects or exhibitions. The board comes without pre-mounted headers, allowing the use of various types of connectors or direct soldering of wires. The pin layout is compatible with the Arduino Mini.

There are two version of the Pro Mini. One runs at 3.3V and 8 MHz, the other at 5V and 16 MHz.

Dimensions
0.7x1.3" (18x33mm)

Features
ATmega328 running at 8MHz with external resonator (0.5% tolerance)
Low-voltage board needs no interfacing circuitry to popular 3.3V devices and modules (GPS, accelerometers, sensors, etc)
0.8mm Thin PCB
USB connection off board
Weighs less than 2 grams!
Supports auto-reset
3.3V regulator
Max 150mA output
Over current protected
DC input 3.3V up to 12V
On board Power and Status LEDs
Analog Pins: 8
Digital I/Os: 14

• The Arduino Pro Mini is a microcontroller board based on the ATmega328p.
• The Arduino Pro Mini is intended for semi-permanent installation in objects or exhibitions.
• There are two version of the Pro Mini. One runs at 3.3V and 8 MHz, the other at 5V and 16 MHz.
• ATmega328 running at 8MHz with external resonator (0.5% tolerance)
• Low-voltage board needs no interfacing circuitry to popular 3.3V devices and modules (GPS, accelerometers, sensors, etc)

The Arduino Pro Mini is a microcontroller board based on the ATmega328p.Seeedstudio