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A-Star 32U4 Micro
The A-Star 32U4 Micro is a tiny programmable module featuring the ATmega32U4 AVR microcontroller. It packs a Micro-USB interface and 18 digital input/output pins (of which 6 are available to be used as PWM outputs and 8 as analog inputs) onto a board measuring only 1″ × 0.6″ and ships preloaded with an Arduino-compatible bootloader.
| Description | Specs (14) | Pictures (10) | Resources (24) | FAQs (0) | On the blog (11) |
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Dimensions
| Size: | 0.6″ × 1.05″ × 0.18″1 |
|---|---|
| Weight: | 1.3 g2 |
General specifications
| Processor: | ATmega32U4 @ 16 MHz |
|---|---|
| RAM size: | 2560 bytes |
| Program memory size: | 32 Kbytes3 |
| Motor channels: | 0 |
| User I/O lines: | 184 |
| Minimum operating voltage: | 5.5 V |
| Maximum operating voltage: | 15 V |
| Logic voltage: | 5 V |
| Reverse voltage protection?: | Y5 |
| External programmer required?: | N |
Identifying markings
| PCB dev codes: | ac01a |
|---|---|
| Other PCB markings: | 0J8063 |
Notes:
- 1
- Without included optional headers. This measurement includes the USB Micro-B connector, which extends 0.05″ past the edge of the PCB.
- 2
- Without included optional headers.
- 3
- Note that 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.
- 4
- All 18 can be used as digital I/O and 8 can be used as analog inputs. 15 of the 18 are available along the sides for use in a breadboard; the remaining three are accessible through the ISP header.
- 5
- On VIN.
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