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Pololu A-Star 32U4 Mini LV

Pololu A-Star 32U4 Mini LV
Pololu A-Star 32U4 Mini LVPololu A-Star 32U4 Mini LVPololu A-Star 32U4 Mini LVPololu A-Star 32U4 Mini LV
Our Price:  £27.06(Inc. 20% VAT)(£22.55 Exc. VAT)Earn 27 Loyalty Points

Part Number:  3103
Brand:  Pololu

Available Now:  

2 in stock, immediate despatch
We have 2right now, but after they have gone, we will be discontinuing this line
  (1 Review)

The A-Star 32U4 Mini LV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-up/step-down regulator that allows it to be powered efficiently from a 2.7 V to 11.8 V supply. This compact 1.9″ × 0.7″ board breaks out all 26 of the microcontroller’s I/O pins (of which 7 can be used as PWM outputs and 12 as analog inputs), and loading programs is made easier by a Micro-USB interface and a preloaded Arduino-compatible bootloader.


The Pololu A-Star 32U4 Mini boards are general-purpose programmable modules based on Atmel’s ATmega32U4 AVR microcontroller, which has 32 KB of flash program memory, 2.5 KB of RAM, and built-in USB functionality. The A-Star (abbreviated A*) adds a number of onboard features to support the microcontroller and make it easier to work with, including a 16 MHz crystal, a USB Micro-B connector, an in-system programming (ISP) header, a reset button, and three indicator LEDs.


A robust power selection circuit enables seamless transitions between regulator power and USB power, and overcurrent and reverse-voltage protection help safeguard the board against accidental damage.

All 26 general-purpose I/O lines on the ATmega32U4 are accessible on the A* 32U4 Mini; 7 of these are usable as PWM outputs and 12 are usable as analog inputs. The board measures 1.9″ × 0.7″, the same size as an Arduino Micro, and features a pair of mounting holes sized for #2 or M2 screws (not included). Its 0.1″ pin spacing makes the A* easy to use with solderless breadboards, perfboards, and 0.1″-pitch connectors.

Our comprehensive user’s guide provides the basics you need to get started with the A-Star as well as detailed technical information for advanced users.


  • Dimensions: 1.9″ × 0.7″ (1.95″ × 0.7″ including USB Micro-B connector)
  • Programmable 16 MHz Atmel ATmega32U4 AVR microcontroller
    • 32 KB flash (4 KB used by bootloader, leaving 28 KB available for user program by default)
    • 2.5 KB SRAM
    • 1 KB EEPROM
    • Native full-speed USB (12 Mbps)
  • Preloaded with Arduino-compatible bootloader (no external programmer required)
  • All I/O lines from the ATmega32U4 broken out in a compact package
    • 26 general-purpose I/O pins available along the sides of the board
    • 7 pins can be configured as hardware PWM outputs
    • 12 pins can be configured as analog inputs
  • 3 user-controllable LEDs
  • Reset button
  • Can be powered from USB or from an external source:
    • ULV: 0.5 V to 5.5 V
    • LV: 2.7 V to 11.8 V
    • SV: 5 V to 36 V
  • Switching regulator enables efficient low-power operation
  • Power selection circuit with seamless switching between power sources and overcurrent protection
  • Reverse-voltage protection on external power inputs
  • Precision 16 MHz crystal
  • 6-pin ISP header for use with an external programmer
  • Comprehensive user’s guide

Customer Reviews
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May be it's me?
Thursday, 9 June 2016  |  David

I was hoping to run this on a 9v supply, the nearest I had was a 10v mains plug type of PSU. I managed to blow up the V In on three of these, if the max in is 11v then may be my PSU has spikes. Although the V In is shot I can still run them by putting +5v on the +5v line.Just beware.DaveL


This review has not been appraised.


Hi Dave - If you have a multimeter you can measure the output from the PSU - I have seen 9V PSUs outputting 15V with no load. Also, the PSU may have been AC, and the boards do not like this. Many thanks for the feedback.