The Pololu A-Star microcontroller boards are general-purpose programmable modules based on Atmel AVR microcontrollers. A USB interface and preloaded Arduino-compatible bootloader on each A* makes it easy to get started programming them. The table below shows some key features and specifications of our A-Star microcontroller boards to help you choose the right one for your application:
| A-Star 328PB Micro | A-Star 32U4 Micro | A-Star 32U4 Mini ULV
A-Star 32U4 Mini LV
A-Star 32U4 Mini SV | A-Star 32U4 Prime LV
A-Star 32U4 Prime SV | A-Star 32U4 Robot Controller LV
A-Star 32U4 Robot Controller SV |
Microcontroller: | ATmega328PB | ATmega32U4 |
User I/O lines: | 24 | 18 | 26 | 26(1) | 26(1) |
PWM outputs: | 9 | 7 | 7 | 7 | 7(1) |
Analog inputs: | 8 | 8 | 12 | 12 | 12(1) |
Ground access points: | 6 | 2 | 4 | 43 | 44 |
User LEDs: | 1 | 2 | 3 | 3 | 3 |
User pushbuttons: | — | — | — | 3 | 3 |
USB interface: | | Yes | Yes | Yes | Yes |
Reset button: | Yes | | Yes | Yes | Yes |
Power switch: | | | | Yes | Yes |
Buzzer option: | | | | Yes | Yes |
microSD option: | | | | Yes | |
LCD option: | | | | Yes | |
Motor drivers: | | | | | Yes |
Operating voltage: | 3.3V VCC: 3.8 V to 15 V 5V VCC: 5.5 V to 15 V | 5.5 V to 15 V | ULV: 0.5 V to 5.5 V LV: 2.7 V to 11.8 V SV: 5 V to 36 V | LV: 2.7 V to 11.8 V SV: 5 V to 36 V | LV: 2.7 V to 11 V SV: 5.5 V to 36 V |
Regulator type: | 3.3 V or 5 V linear | 5 V linear | 5 V switching
ULV: step-up LV: step-up/step-down SV: step-down | 5 V switching
LV: step-up/step-down SV: step-down | 5 V switching
LV: step-up/step-down SV: step-down |
Regulated current:(2) | 100 mA | 100 mA | ULV: 500 mA LV: 1 A SV: 500 mA | 1 A | LV: 1 A SV: 1.5 A |
Dimensions: | 1.3″ × 0.7″ | 1″ × 0.6″ | 1.9″ × 0.7″ | 2.8″ × 2.1″ | 2.6″ × 2.2″ |
Weight: | 1.5 g(3) | 1.3 g(3) | 3.4 g(3) | 13 g to 33 g | 14 g to 23 g
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1 Some microcontroller resources are used by on-board hardware. |
2 These values are rough approximations for comparison purposes. Available current depends on input voltage, current consumed by the board, ambient conditions, and regulator topology. See product documentation and performance graphs for details. |
3 Without included optional headers. |