The Zumo 32U4 is a highly integrated, user-programmable and customizable tracked robot. It measures less than 10 cm on each side and weighs approximately 275 g with batteries (170 g without), so it is both small enough and light enough to qualify for Mini-Sumo competitions, but its versatility makes it capable of much more than just robot sumo battles.

At the heart of the Zumo 32U4 is an Atmel ATmega32U4 AVR microcontroller, and like our A-Star 32U4 programmable controllers, the Zumo 32U4 features a USB interface and ships preloaded with an Arduino-compatible bootloader. A software add-on is available that makes it easy to program the robot from the Arduino environment, and we have Arduino libraries and example sketches to help get you started. A USB A to Micro-B cable (not included) is required for programming. For advanced users who want to customize or enhance their robots with additional peripherals, the robot’s power rails and microcontroller’s I/O lines can be accessed via 0.1″-spaced through-holes along the sides and front of the main board.

Assembled Zumo 32U4 robot, front view.

Assembled Zumo 32U4 robot, side view.

Assembled Zumo 32U4 robot, back view.

The Zumo 32U4 features two H-bridge motor drivers and a variety of integrated sensors, including a pair of quadrature encoders for closed-loop motor control, a complete inertial measurement unit (3-axis accelerometer, gyro, and magnetometer), five downward-facing reflectance sensors for line-following or edge-detection, and front- and side-facing proximity sensors for obstacle detection and ranging. Three on-board pushbuttons offer a convenient interface for user input, and an LCD, buzzer, and indicator LEDs allow the robot to provide feedback.

The Zumo 32U4 robot is available fully assembled with three different motor options (see the Motors section below for more information on how these different gear ratios perform):

The Zumo 32U4 robot is also available as a kit (without motors) for those who would prefer to assemble it themselves or who want to use different motors than those in the three assembled versions.

Details for item #3124

This version of the Zumo 32U4 robot (item #3124) is a kit; assembly (including soldering) is required. Motors and batteries are sold separately. A USB A to Micro-B cable (not included) is required for programming.

New blade! As of August 27, 2015, we are shipping these kits with a new blade style (as shown in the kit contents picture below). Unlike the previous blade, which shipped flat, this version has its chassis mounting tabs pre-bent to the appropriate angle. It also features cutouts around the general-purpose mounting holes, allowing them to be bent to different angles if the application calls for it (e.g. to tilt the proximity sensor emitters up or down).

Kit contents

Contents of the #3124 Zumo 32U4 robot kit.

With the exception of motors, batteries, and a USB A to Micro-B cable, this kit contains everything necessary to build and operate a Zumo 32U4 robot:

Assembled Zumo 32U4 robot.

See the Zumo 32U4 robot user’s guide for detailed assembly instructions.

Motors (not included with item #3124)

Micro metal gearmotor with extended motor shaft.

The Zumo chassis uses two micro metal gearmotors, one for each tread. The ideal motors for your robot depend on your desired torque, speed, and current draw, so motors are not included with the kit version of the chassis (motors are included with the assembled versions of the Zumo 32U4 robot). We generally recommend using high-power (HP or HPCB, which have long-life carbon brushes) versions of our micro metal gearmotors since the tracks require a decent amount of torque to move effectively; higher gear ratios of the non-HP motors might work if you want lower current draw, but they will be slower and offer less control. Specifically, we primarily recommend the 50:1, 75:1, or 100:1 HP (or HPCB) motors for use with this chassis, and these are the versions we include in our assembled Zumo 32U4 robot. Additionally, be sure to get a version with extended motor shafts if you want to be able to use the Zumo 32U4’s encoders.

You can use the following table to compare these three gear ratios in more detail. The first four columns are specifications of the motors themselves, while the last column is the measured top speed of a Zumo chassis loaded to a weight of 500 g and driven with these motors. Note that the specifications are for 6V operation, which is approximately the voltage you would get with four alkaline batteries; four NiMH AA cells will typically provide less than 5V.

Micro Metal
Free-Run Speed
@ 6V
Stall Torque
@ 6V
Stall Current
@ 6V
Top Zumo Speed
@ 6V and 500g
50:1 HP or 50:1 HPCB 625 RPM 15 oz·in 1600 mA 40 in/s (100 cm/s)
75:1 HP or 75:1 HPCB 400 RPM 22 oz·in 1600 mA 25 in/s (65 cm/s)
100:1 HP or 100:1 HPCB 320 RPM 30 oz·in 1600 mA 20 in/s (50 cm/s)

Batteries (not included)

The Zumo 32U4 robot runs off of four AA batteries. It works with both alkaline and NiMH batteries, though we recommend using rechargeable AA NiMH cells.

Optional accessories

  • Even more sensors
  • Connectors (headers, jumper wires, etc) for adding those sensors or other peripherals
  • Tools (soldering iron, diagonal cutters, pliers, screwdrivers, etc) to help with kit assembly

Comparison with the Zumo robot kit for Arduino (with Zumo Shield)

Our older Zumo robot for Arduino, built with a Zumo Shield, is another Arduino-compatible robotic platform based on the Zumo chassis. The Zumo Shield mounts to the Zumo chassis and features motor drivers and various sensors, but it does not have an integrated microcontroller; rather, it is designed to interface with boards that have a standard Arduino form factor, like an Arduino Uno, Arduino Leonardo, or A-Star 32U4 Prime, and these boards serve as the main controller for the robot.

A Zumo 32U4 robot (left) and a Zumo robot for Arduino with an A-Star 32U4 Prime LV (right).

By contrast, the Zumo 32U4 includes an on-board ATmega32U4 microcontroller (the same one used in the Leonardo and A-Star 32U4 boards), combining the functions of the Zumo Shield and the separate Arduino controller into a single, compact board that is just as easy to program as a standard Arduino or A-Star thanks to its USB interface and preloaded Arduino-compatible bootloader. The Zumo 32U4 retains all the features of the Zumo shield (e.g. dual motor drivers, inertial sensors, and buzzer) while adding many new features, including dual quadrature encoders, proximity sensors, an LCD, and two extra user pushbuttons.

Some of the pin mappings and software libraries differ between the Zumo 32U4 and Zumo robot for Arduino, so programs written for one robot generally need to be modified to work on the other.


General specifications

Version: kit — assembly required, motors not included


Documentation and other information

Pololu Zumo 32U4 Robot User’s Guide (Printable PDF)

User’s manual for the Pololu Zumo 32U4 robot.

File downloads

Pololu A-Star 32U4 drivers for Windows (version (7k zip)
This download contains the Windows drivers for the A-Star 32U4 and the rest of our 32U4 family of boards.
Zumo 32U4 pinout diagram (536k pdf)
Printable pinout diagram of the Zumo 32U4 main board.
Zumo 32U4 schematic diagram (1MB pdf)
Printable schematic diagram of the Zumo 32U4 robot.
3D model of the assembled Zumo 32U4 Robot (40MB step)
This model uses simplified models of the control electronics to reduce the file size. More detailed models are available separately of the Zumo 32U4 main board (23MB step) and Zumo 32U4 front sensor array (4MB step).
Dimension diagram of the Zumo 32U4 Main Board (482k pdf)
Zumo 32U4 main board drill guide (236k dxf)
This DXF drawing shows the locations of all of the board’s holes.
Zumo 32U4 robot 3D model (30MB pdf)
Rotatable 3D model of an assembled Zumo 32U4 robot (Note: this file might not work properly with all pdf viewers.)
Texas Instruments DRV8837/DRV8838 motor driver datasheet (1MB pdf)
LSM303D datasheet (1MB pdf)
Datasheet for the ST LSM303D 3D accelerometer and 3D magnetometer module.
L3GD20H datasheet (3MB pdf)
Datasheet for the ST L3GD20H three-axis digital-output gyroscope.
Datasheet for the Sharp GP2S60 compact reflective photointerrupter (164k pdf)
Datasheet for the sensor used on the QTR-3RC and QTR-3A Reflectance Sensor Arrays, the Zumo 32U4 robot front sensor array, and the Optical Encoders for micro metal gearmotors.
Vishay TSSP77038 IR receiver module datasheet (268k pdf)
TPS2113A datasheet (1MB pdf)
Datasheet for the Texas Instruments TPS2113A autoswitching power mux.


SKU PL-3124
Brand Pololu

Be The First To Review This Product!

Help other Little Bird Company Pty Ltd users shop smarter by writing reviews for products you have purchased.

Write a product review

Others Also Bought

More From This Category