The A-Star 32U4 Micro is a tiny programmable module featuring Atmel’s ATmega32U4 microcontroller. It packs a Micro-USB interface and 15 digital input/output pins (of which 7 can be used as PWM outputs and 8 as analogue inputs) onto a board measuring only 1€³ × 0.6€³ and comes preloaded with an Arduino-compatible bootloader.
- Dimensions: "Œ_ x 0.6" (1.05" x 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
- 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