Microcontroller addon boards
We carry a variety of microcontroller development boards for the Raspberry Pi Model A+/B+/2B with a focus on flexibility and hackability, while still being easy to use. All boards come with open source software that runs on the Raspberry Pi.
There are 2 boards based on 8 bit Atmel AVR (AVRPi-x), and one board based on 32 bit ARM Cortex M3 (ARMinARM).
| AVRPi-328 | AVRPi-32U4 | ARMinARM | |
|---|---|---|---|
| Image |  |
 |
 |
| Microcontroller | Atmel ATmega328p | Atmel ATmega32U4 | STM32F103RET6 |
| Type | 8 bit AVR | 8 bit AVR | 32 bit ARM Cortex-M3 |
| Frequency | 8/12/16 MHz | 8 MHz | 72 MHz |
| Flash | 32KB | 32KB | 512KB |
| SRAM | 2KB | 2.5KB | 64KB |
| EEPROM | 1KB | 1KB | - |
| Voltage | 3.3 Volt (5V tolerant) | 3.3 Volt (5V tolerant) | 3.3 Volt (most pins 5V tolerant) |
| Arduino compatible | Yes (Arduino Pro + Pro Mini + Fio + Lilypad) | Yes (Arduino Leonardo + Micro + Esplora) | Partially (Leaflabs' Maple) |
| USB HID | No (possible in software) | Yes | Yes |
| Raspberry Pi GPIO | All 26 A+/B+/2B GPIO pins | All 26 A+/B+/2B GPIO pins | All 26 A+/B+/2B GPIO pins |
| mcu GPIO | All ATmega328p pins | All ATmega32U4 pins | All STM32F103RET6 pins |