Pololu A-Star 32U4 Prime SV microSD

The A-Star 32U4 Prime SV is a programmable board based on Atmel’s ATmega32U4 microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products, including superior power management that enables efficient operation from 5 V to 36 V. The A-Star 32U4 Prime SV is available in several configurations; This product includes preinstalled female headers common to many Arduinos and microSD support.

Our comprehensive user’s guide provides the basics you need to get started with the A-Star as well as detailed technical information for advanced users.

Features

• Programmable ATmega32U4 MCU with 32 KB flash, 2.5 KB SRAM, 1 KB EEPROM, and native full-speed USB (clocked by precision 16 MHz crystal oscillator)
• Preloaded with Arduino-compatible bootloader (no external programmer required)
• All 26 general-purpose I/O lines from the ATmega32U4 are broken out (including PB0, PD5, and PE2); 7 of these can be used as hardware PWM outputs and 12 of these can be used as analog inputs
• Convenient 0.1″-spaced power, ground, and signal connection points
• Buzzer option for simple sounds and music
• microSD support (microSD version only)
• HD44780-based character LCD option
• 3 user-controllable LEDs
• 3 user pushbuttons
• Reset button
• Power features:
• Can be powered from USB or from an external source (with several access points for connecting external power)
• LV operating range: 2.7 V to 11.8 V
• SV operating range: 5 V to 36 V
• Switching 5 V regulator enables efficient operation
• 3.3 V rail supplied by 300 mA linear regulator
• Power switch for external power inputs
• Reverse-voltage protection on external power inputs
• Power selection circuit allows for seamless switching between power sources while providing overcurrent protection, and feedback about which power source is selected
• 6-pin ISP header for use with an external programmer
• Comprehensive user’s guide