Description: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.
- Features  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)
- 2.5 KB SRAM
- 1 KB EEPROM
- 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
- Â 2 user-controllable LEDs
- Â Can be powered from USB or external 5.5 V to 15 V source on VIN
- Â PTC fuse on VBUS supply
- Â Reverse-voltage protection on VIN supply
-  6-pin ISP header for use with an external programmer
Specification:
| Size | : | 0.6″ × 1.05″ × 0.18″ |
| Weight | : | 1.3 g |
| Processor | : | ATmega32U4 @ 16 MHz |
| RAM size | : | 2560 bytes |
| Program memory size | : | 32 Kbytes |
| Motor channels | : | 0 |
| User I/O lines | : | 154 |
| Minimum operating voltage | : | 5.5 V |
| Maximum operating voltage | : | 15 V |
| Logic voltage | : | 5 V |
| Reverse voltage protection | : | Yes |
| External programmer required | : | No |
Note: 4 KB of the MCU’s 32 KB of flash memory is used by the pre-installed USB bootloader. All 32 KB is available when programming via the ISP header rather than the bootloader.Â
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