Pololu Zumo Arduino Sumo robot


The Pololu Zumo 32U4 OLED Sumo robot is a versatile tracked robot based on the Arduino-compatible ATmega32U4 MCU. It includes two HP micro metal gearmotors along with integrated dual motor drivers, a graphical OLED display, quadrature encoders, line sensors, side and front proximity sensors for detecting objects, and a full IMU for detecting impacts and tracking orientation. The low-profile robot is less than 10 cm × 10 cm—small enough to qualify for Mini Sumo. No soldering or assembly is required; just add 4 AA batteries and a USB cable and your Zumo is ready for programming.

Although this is an ideal bot to use as a Sumo Robot, the Arduino platform and versatile capabilities make the bot perfect for Arduino robotics, STEM classes and experimentation, and general robotics

The Zumo 32U4 OLED Sumo robot comes in four configurations: 50:1 motors, 75:1 motors, 100:1 motors, or as a buildable kit.

You can find the C++ Library for both the older version of the Zumo and the newer Zumo OLED model here:


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Pololu Arduino Mini Sumo Robot: The Zumo 32U4 OLED robot

Looking for a great kit for robot sumo?

The Zumo 32U4 OLED Sumo robot 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 (160 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 OLED Sumo robot is an ATmega32U4 AVR microcontroller from Microchip (formerly Atmel). 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.

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 a 128×64 graphical OLED display, buzzer, and indicator LEDs allow the robot to provide feedback.

The Zumo 32U4 OLED 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):

  • Assembled with 50:1 HP motors — highest speed and lowest torque of the three options
  • Assembled with 75:1 HP motors — average speed and torque
  • Assembled with 100:1 HP motors — highest torque and lowest speed

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 Gearmotor 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)

The Zumo 32U4 OLED Sumo 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 we provide.

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