Welcome to the SparkFun community! to share projects and receive help.

It’s blue! It’s thin! It’s the Arduino Pro Mini! SparkFun’s minimal design approach to Arduino. 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.

We really wanted to minimize the cost of an Arduino. In order to accomplish this we used all SMD components, made it two layer, etc. 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.

The latest and greatest version of this board breaks out the ADC6 and ADC7 pins as well as adds footprints for optional I2C pull-up resistors! We also took the opportunity to slap it with the OSHW logo.

Can’t decide which Arduino is right for you? Arduino buying guide!

Note: A portion of this sale is given back to Arduino LLC to help fund continued development of new tools and new IDE features.

Dimensions: 0.7x1.3" (18x33mm)


  • 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


Mapping Household Temperature Flow with Cheap Sensors
  • 30,858
  • 104

Work in progress

Smarter Home Energy Use with Open Source and Cheap Sensors.

Home Automation Control Panel
  • 17,693
  • 68

Work in progress

A touchscreen control panel for home IOT devices. Arduino, Raspberry Pi, RFM69, mqtt and more.

Ultimate Kegerator
Super hard
  • 10,429
  • 46

Full instructions

Use the power of a Windows 10 UWP app to control and monitor a kegerator to keep your beverages cold, fresh and always on tap.

Magic Morse on Arduino
  • 17,581
  • 20

Full instructions

Learn or sharpen your Morse Code skills with Magic Morse implemented on Arduino!

Arduino Based Weather Station with Remote Sensor Unit
  • 3,871
  • 25

Arduino based 5" LCD touchscreen weather station with remote sensor unit.

  • 1,917
  • 22

Work in progress

Make life an adventure with new places and companions!


Team Transplants

Simple FM Radio
  • 9,787
  • 11

Full instructions

Simple FM radio based on RDA5807M module and Arduino pro-mini 3.3V.

Weather Wand
  • 8,220
  • 19

Work in progress

Magic wand to paint with color light based on temperature.

Using FreeRTOS Semaphores in Arduino IDE
  • 6,359
  • 16


FreeRTOS, simple, easy, robust, and optimised for Arduino IDE. Using FreeRTOS Semaphores to share and protect physical resources.

Battery Powered Arduino Applications through FreeRTOS
  • 5,816
  • 15


Use FreeRTOS (simple, easy, robust, & optimised for the Arduino IDE) to reduce the power required for battery or low power applications.

$5 Nokia Serial Terminal Display
  • 8,797
  • 12

Full instructions

Nokia 5110 and Arduino mini make a great serial monitor that can easily be battery powered at 3 Volts.

  • 1,528
  • 16

An interactive Cinderella dress that lights up with the wearer's movements.

Smart Home - Smart Rules using ARTIK Cloud & Photon
  • 2,641
  • 11

Full instructions

Home Automation - Monitor the sensor data, Electrical appliances and smart push notifications using ARTIK Cloud.

Smart Cap
  • 1,536
  • 8

Full instructions

Good vision is a precious gift but unfortunately loss of vision is becoming common now-a-days. Smart cap can help with navigation.

Arduino Dice roller
  • 1,947
  • 9

    Designed to be low cost, Arduino Pro Mini Very cheap compact postage size Arduino. driving I2C OLED Display

HopeRF Springs Eternal
  • 3,098
  • 7

Full instructions

Bring a pair of RFM12B's from HopeRF on-line quickly for Arduino packet radio experiments and projects.

An Adequate Thermometer
  • 1,915
  • 7

Full instructions

An adequate tool to keep in your First aid kit.

S(mart) - Coop
  • 1,337
  • 7

Automated chicken coop: automatic water and feed dispenser, IR based egg counter and notifier.

Arduino Based IR Thermometer with TFT Display and TMP006
  • 1,107
  • 7

Full instructions

Just a simple infrared thermometer.

Ambient Light Sensor with Arduino
  • 2,747
  • 5


We need to sense intensity of light in many of our IoT/home automation projects. Here I explain a simple implementation of ambient sensor.

Upgrading a BadgerStick
  • 777
  • 6

Full instructions

How to upgrade the BadgerStick Arduino board by SparkFun, if you got one at SXSW 2015

ProjectsCommunitiesContestsLiveAppsBetaFree StoreBlogAdd projectSign up / Login