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A-Star 32U4 Micro

A-Star 32U4 Micro

A-Star 32U4 Micro


The Pololu A-Star 32U4 Micro is a general-purpose programmable module 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. Onboard features of the A-Star (abbreviated A*) include a 16 MHz resonator, a USB Micro-B connector, an in-system programming (ISP) header, and a pair of indicator LEDs. A voltage regulator and power selection circuit allow the board to be powered from either USB or an external 5.5 V to 15 V source, while a resettable PTC fuse on the USB VBUS supply and reverse protection on VIN help protect it from accidental damage.

The A-Star 32U4 Micro breaks out 15 general-purpose I/O lines along two rows of pins, including 7 usable as PWM outputs and 8 usable as analog inputs. It fits all this into a 20-pin dual in-line package (DIP) measuring only 1″ × 0.6″ (even smaller than competing ATmega32U4 boards like the Teensy 2.0 and Pro Micro), and 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″ × 0.6″ (1.05″ × 0.6″ 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)
Native full-speed USB (12 Mbps)
• Preloaded with Arduino-compatible bootloader (no external programmer required)
• Many I/O lines in a small package
15 general-purpose I/O pins available along the sides of the board
3 additional I/O pins available on ISP header
7 pins can be configured as hardware PWM outputs
8 pins can be configured as analog inputs
• 2 user-controllable LEDs
• Can be powered from USB or external 5.5 V to 15 V source on VIN
• PTC fuse on VBUS supply
• Reverse-voltage protection on VIN supply
• 6-pin ISP header for use with an external programmer
• Comprehensive user’s guide


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