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A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge (SMT Components Only)
This programmable module is designed to be the core of a small robot, either as an auxiliary controller atop a Raspberry Pi base or as a complete control solution on its own. Its ATmega32U4 AVR microcontroller comes preloaded with an Arduino-compatible bootloader. On-board hardware includes dual motor drivers that can deliver 1.8 A per channel and an efficient voltage regulator that allows the controller to work with a 2.7 V to 11 V input voltage, along with level shifters that enable it to interface with a Raspberry Pi. This version (item #3116) does not include any through-hole components or connectors, allowing for customized assembly or standalone use.
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Raspberry Pi Expansion Boards or
A-Star 32U4 Robot Controller.
Description | Specs (19) | Pictures (12) | Resources (22) | FAQs (0) | On the blog (3) |
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Documentation and other information

User’s manual for the Pololu A-Star 32U4 Robot Controller with Raspberry Pi Bridge.
File downloads
- Pololu A-Star 32U4 drivers for Windows (version 1.3.0.0) (7k zip)
- This download contains the Windows drivers for the A-Star 32U4 and the rest of our 32U4 family of boards.
- Pinout and power distribution diagrams of the A-Star 32U4 Robot Controller with Raspberry Pi Bridge (8MB pdf)
- Printable pinout and power distribution diagrams of the A-Star 32U4 Robot Controller with Raspberry Pi Bridge.
- Schematic diagram of the A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge (382k pdf)
- Printable schematic for the A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge.
- Dimension diagram of the A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge (2MB pdf)
- 3D model of the A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge (23MB step)
- Drill guide for the A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge (188k dxf)
- This DXF drawing shows the locations of all of the board’s holes.
- Texas Instruments DRV8837/DRV8838 motor driver datasheet (1MB pdf)
Recommended links
- A-Star 32U4 Arduino library
- The AStar32U4 library for the Arduino IDE helps interface with the on-board hardware on the A-Star 32U4 controllers.
- AStar32U4 library documentation
- A-Star repository on GitHub
- This repository contains Arduino add-on files, Windows drivers, and bootloaders for the A-Star 328PB, A-Star 32U4, and the rest of our 32U4 family of boards.
- Raspberry Pi slave library for Arduino
- This is an Arduino library that helps establish I²C communication between an A-Star 32U4 Robot Controller and a Raspberry Pi, with the Arduino acting as the I²C slave. Example Arduino code and Python code for the Raspberry Pi are included.
- Building a Raspberry Pi robot with the A-Star 32U4 Robot Controller
- This blog post shows how to build an expandable robot platform based on a Raspberry Pi and an A-Star 32U4 Robot Controller using our Raspberry Pi slave library for Arduino.
- Arduino Software
- Arduino integrated development environment (IDE) software
- ATmega32U4 documentation
- Microchip’s product page for the ATmega32U4 AVR microcontroller, with links to its datasheet, application notes, and other resources.
- AVR Libc Home Page
- The web site for AVR Libc, which is the standard library of functions that you can use with C and C++ on the AVR.
- Pololu A-Star and Orangutan Forum Section
- The A-Star and Orangutan discussion section of the Pololu Robotics Forum.
- AVR Freaks
- AVR community with forums, projects, and AVR news.
- AVRDUDE
- AVRDUDE is a cross-platform command-line utility for programming the flash memory on AVR microcontrollers.
- LUFA – the Lightweight USB Framework for AVRs
- LUFA is an embedded software library written in C that can be used to create USB applications on USB-capable AVRs. It comes with a large library of example USB applications and bootloaders.
- Atmel Studio 7
- Free integrated development environment (IDE) for AVRs.
- WinAVR
- A free, open-source suite of development tools for the AVR family of microcontrollers, including the GNU GCC compiler for C/C++.