The AVRPi-32U4 is an Atmel ATmega32U4 add on board for the Raspberry Pi A+, B+ and 2B. It runs on 3.3V at 8 MHz.

The ATmega32U4 is programmable as a USB device. This is useful if you want a USB HID device that can be controlled by the Raspberry Pi or yourself such as a keyboard, joystick, mouse, midi, audio or virtual serial device.

All software is easy installable navigating a simple menu. Choose:

• 'e) install everything in 1 easy step'
• 'f) set fuses for atmega32u4 on avrpi32u4 board'

That's all it takes to get you started.

Programming and uploading

The ATmega32U4 can be programmed in the Arduino IDE, but also using the Arduino library and a Makefile, or straight C or assembly. All software that is used on the Pi and the ATmega32U4 is open source with the source code provided.

Using the LUFA library is recommended for the AVRPi-32u4, but the Arduino library works great as well. Either in the IDE or using Arduino-Makefile in your favourite text-editor.

AVRPi boards use the latest avrdude-6.1 with the built-in linuxgpio interface.

For more information (pinout, datasheets) please visit www.onandoffables.com

This board comes as a kit (solder through hole headers yourself), and without a Raspberry Pi.

The kit contains

• 1x AVRPi-32U4 board with all SMD components already soldered on
• All male and female pin headers you need
• Plenty of jumpers (12 pieces)
• 4x 11mm. M2.5 standoffs and 8x 6mm. M2.5 screws