This is a 3.3V Arduino running the 8MHz bootloader. Arduino Pro Mini does not come with connectors populated so that you can solder in any connector or wire with any orientation you need. We recommend first time Arduino users start with the Uno R3. It’s a great board that will get you up and running quickly. The Arduino Pro series is meant for users that understand the limitations of system voltage (3.3V), lack of connectors, and USB off board.

This board connects directly to the FTDI Basic Breakout board and supports auto-reset. The Arduino Pro Mini also works with the FTDI cable but the FTDI cable does not bring out the DTR pin so the auto-reset feature will not work. There is a voltage regulator on board so it can accept voltage up to 12VDC. If you’re supplying unregulated power to the board, be sure to connect to the “RAW” pin on not VCC.

Key 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

0.7×1.3″ (18x33mm)

Resources

Getting Started Tutorial

Graphical Datasheet

GitHub

Das Blinken Top Hat

Interactive Hanging LED Array

Arduino Data Glasses for My Multimeter

Mapping Household Temperature Flow with Cheap Sensors

Home Automation Control Panel

Arduino Apple Watch