Zumo 32U4 OLED Robot (Assembled with 75:1 HP Motors). The Pololu Zumo 32U4 OLED robot is a versatile tracked robot based on the Arduino-compatible ATmega32U4 MCU. It includes two 75:1 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.
The Zumo 32U4 OLED 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 is an ATmega32U4 AVR microcontroller from Microchip (formerly Atmel), 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.
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
The Zumo 32U4 OLED 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 #4992 This version of the Zumo 32U4 OLED robot (item #4992) ships fully assembled with a pair of 75:1 HP micro metal gearmotors (with extended motor shafts). As described above, two assembled versions are also available, one with a higher gear ratio that is slower but can deliver more torque and one with a lower gear ratio that is faster but delivers less torque.
This is a newer Zumo 32U4 OLED Robot with a graphical OLED display. For its original version counterpart with an LCD, see the Zumo 32U4 Robot (Assembled with 75:1 HP Motors).
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
75:1 HP or 75:1 HPCB
100:1 HP or 100:1 HPCB
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.
Even more sensors
Connectors (headers, jumper wires, etc) for adding those sensors or other peripherals
Tools (diagonal cutters, pliers, screwdrivers, etc) to help with kit assembly
Replacement sprockets in red or white. The Zumo 32U4 robot includes the black sprockets shown in the left picture below, but other colors can be purchased separately if you want to add a bit of personalization to your robot.