A-Star 32U4 Micro

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  • A-Star 32u4 Micro is a very small, programmable, useful and multi purpose developer board holding Atmega32u4 microcontroller on it. It is fully compatible with Arduino. Sizes of this little board are 2.5 cm x 1.5 cm. There are totally 18 I/O pins on the board (7 of them as PWM, 8 of them as Analog input).

    Atmega32u4 supports usb port internally, so it is possible to connect the board directly to the computer and by the pre-loaded you may use Arduino IDE easily. Pololu - made these A-Star boards based on Atmege32u4 microcontroller.

    Atmega32u4 supports internal 32 kB flash memory, 2.5 kB SRAM and inter lan usb interface. There is a micro usb connector on the board for computer connection but the kit does not include usb cable. Moreover, there are ISP pins, LEDs and a crystal oscillator on the board. The board is supplied by usb connector or an external 5.5 - 15 V voltage supply. There is an internal voltage regulator on the board, consequently, it is possible to supply the board with 5.5 - 15 V input voltage.

    There are 26 I/O pins on A-Star 32u4 Micro, 15 of them are placed at sides. 3 of them are on the ISP socket. 7 of these pins can be configured as PWM out, 8 of them can be configered as analog input. This board is compatible to use on bread board. It occupies a place as 20-pin DIP IC.

    User Guide contains detailed information about A-Star Mini LV and the other A-Star boards.

    Note: The kit does not include Micro Usb cable.


    • Sizes: 2.5 x 1.5 cm
    • Programmable 16 Mhz Atmega3284 microcontroller
    • 32 kB Flash memory (4 kB is used by bootloader)
    • 2.5 kB SRAM
    • 1 kB EEPROM
    • Internal usb port
    • Pre-loaded Arduino bootloader
    • 18 digital I/O pins
    • 7 pin as PWM
    • 8 pin as Analog in
    • User controlled 3 LEDs
    • Reset button
    • Usb or external supply
    • Power protection for usb line
    • Reverse voltage protection for external supply
    • 6-pin ISP connentors (for external programming),
    • Extensive User Guide

    Vin pins are used for 5.5 V - 15 V input. Output current of the onboard regulator is 100 mA. There is also a 3.3 V regulator with 50 mA output current on the board too.

    Pin Mapping:

    Note: The headers on the board comes as unsoldered.

Prepared by  T-Soft E-Commerce.