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SparkFun Pro Mini ATmega328-5V/16MHz Development Board Compatible with Arduino Boards and IDE

4.5 out of 5 stars 53 ratings

$10.95
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  • ATmega328 running at 16MHz with external resonator (0.5% tolerance)
  • No USB connection off board. Need FTDI board (or similar device) to program.
  • Supports auto-reset
  • 5V regulator
  • Max 150mA output

Frequently bought together

  • SparkFun Pro Mini ATmega328-5V/16MHz Development Board Compatible with Arduino Boards and IDE
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  • HiLetgo FT232RL FTDI Mini USB to TTL Serial Converter Adapter Module 3.3V 5.5V FT232R Breakout FT232RL USB to Serial Mini USB
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  • SparkFun FTDI Basic Breakout - 5V
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SparkFun Pro Mini ATmega328-5V/16MHz Development Board Compatible with Arduino Boards and IDE


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Product Description

The Pro Mini's pins surround three of the four sides. The pins on the short side are used for programming, they match up to the FTDI Basic Breakout. The pins on the other two sides are an assortment of power and GPIO pins (just like the standard Arduino).

There are three different power-related pins: GND, VCC, and RAW. GND, obviously, is the common/ground/0V reference. RAW is the input voltage that runs into the regulator. The voltage at this input can be anywhere from 3.4 to 12V. The voltage at VCC is supplied directly to the Pro Mini, so any voltage applied to that pin should already be regulated to 3.3V.

Four pins are actually not located on the edge of the board: A4, A5, A6 and A7. Each of these analog pins is labeled on the back side of the board.

The Mini packs almost as much microprocessor-punch as the regular Arduino, but there are a few major hardware changes you should be aware of before you start adapting your project to the Mini. The first glaring hardware difference is the voltage that the Mini operates at: 3.3V. Unlike the Arduino Uno, which has both a 5V and 3.3V regulator on board, the Mini only has one regulator. This means that if you've got peripherals that only work at 5V, you might have to do some level shifting before you hook it up to the Pro Mini (or you could go for the 5V variant of the Pro Mini).

Another major variation from the standard Arduino lies in the speed at which the ATmega328 runs. The Pro Mini 3.3V runs at 8MHz, half the speed of an Arduino Uno. We put a slower resonator on the Mini to ensure safe operation of the ATmega. That said, don't let the slower speed scare you away from using the Mini; 8MHz is still plenty fast, and the Mini will still be capable of controlling almost any project the Arduino Uno can.

Technical Specifications

ATmega328 Running at 16MHz with external resonator (0.5% tolerance)
Thin PCB 0.8mm
Connection USB connection off board
Supports Auto-Reset
Regulator 5V
Max Output 150mA
Protected Against Over current
Weight <2 grams
DC input 5V up to 12V
On Board LEDs Power and Status
Analog Pins 8
Digital I/Os 14
0.7x1.3" (18x33mm)

Customer reviews

4.5 out of 5 stars
4.5 out of 5
53 global ratings

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5.0 out of 5 stars Used for son's science project
By Gary G. on January 2, 2022
We used this for my son's science project, so it got carried around, left out in the cold (in a weatherproof enclosure), uploaded to numerous times, and is still doing its job.
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