The Pololu Zumo robot is an Arduino-controllable tracked robot platform that is less than 10 cm × 10 cm—small enough to qualify for Mini Sumo. It includes two micro metal gearmotors coupled to a pair of silicone tracks, a stainless steel bulldozer-style blade, an array of six infrared reflectance sensors for line following or edge detection, a buzzer for simple sounds and music, a 3-axis accelerometer, magnetometer, and gyro for detecting impacts and tracking orientation. Just add 4 AA batteries and an Arduino (or compatible controller) and you are ready to push! No soldering or assembly is required.
The Zumo robot is a low-profile tracked robot platform intended for use with an Arduino (or compatible device) as its main controller. It measures less than 10 cm on each side and weighs approximately 300 g with an Arduino Uno and batteries (165 g without, as shipped), so it is both small enough and light enough to qualify for Mini-Sumo competitions. It uses two 75:1 HP micro metal gearmotors to drive the treads, providing plenty of torque and a top speed of approximately 2 feet per second (60 cm/s), which makes it much more agile than competing robots like the Solarbotics Sumovore and Parallax SumoBotwhile still offering plenty of control. The Zumo robot includes a 0.036"-thick laser-cut stainless steel sumo blade mounted to the front of the chassis for pushing around objects like other robots, and a reflectance sensor arraymounted along the front edge of the Zumo (behind the sumo blade) allows the Zumo to detect features on the ground in front of it, such as lines for following or edges for avoiding.
The Zumo control board is essentially a shield for the Arduino Uno or Leonardo, both of which can be plugged directly into the shield’s male header pins, face down. (It is not compatible with the Arduino Mega or Due, but it can be used with older Arduinos that have the same form factor as the Uno, such as the Duemilanove.) The shield includes dual motor drivers, a buzzer for playing simple sounds and music, a user pushbutton, and a 3-axis accelerometer, compass, and gyroscope for sensing impacts and tracking orientation. It also boosts the battery voltage to power the Arduino and breaks out the Arduino I/O lines, reset button, and user LED for convenient access and to accommodate additional sensors. The only difference between this and the previous Zumo Robot version is the use of a v1.2 Zumo shield in place of the previous shield version. This newer control board has a newer accelerometer/magnetometer module and adds a 3-axis gyroscope, but it is otherwise identical to the previous shield.
Our Zumo Arduino libraries make it easy to interface with all of the integrated hardware, and we provide a number of sample programs that show how to use the Zumo’s reflectance array, pushbutton, buzzer, and motors. We have also written a basic LSM303 Arduino library and L3G Arduino library that make it easier interface with the built-in LSM303D 3-axis accelerometer and magnetometer and L3GD20H 3-axis gyro.
The robot ships as shown in the main product picture; no assembly or soldering is required. An appropriate Arduino(or compatible controller) and four AA batteries are required but not included.
- Integrated 75:1 HP micro metal gearmotors that offer a good blend of speed (up to 2 feet per second), power, and control.
- Mounted array of six IR reflectance sensors that allows the Zumo to detect contrasts in reflectivity directly beneath its blade, which can be used for following lines or detecting edges (e.g. the white outer area of a sumo ring or the edge of a table).
- Integrated DRV8835 dual motor drivers capable of delivering enough current for the Zumo’s two high-power gearmotors.
- Piezo buzzer for playing simple sounds and music. The buzzer is controlled by one of the Arduino’s PWM outputs, so tones can be generated in the background without taking up a lot of processing power.
- Integrated LSM303D 3-axis accelerometer and 3-axis magnetometer that can be used to detect impacts. The compass gets a lot of interference from the motors, batteries, PCB, and its surroundings, so it is not generally useful for precision navigation, but we have found that with proper calibration, it can be used for rough orientation measuring in many environments. This part is an upgrade over the LSM303DLHCaccelerometer/magnetometer IC included on previous versions of the Zumo shield for Arduino.
- Integrated L3GD20H 3-axis gyroscope that can be used to track rotation. This is new on the v1.2 version of the Zumo shield; previous versions did not include a gyro. With this sensor and the LSM303D mentioned above, the shield effectively has a built-in MinIMU-9 v3 IMU module that can optionally be used to make a attitude and heading reference system (AHRS) so that your robot can its orientation.
- Optional user pushbutton on pin 12.
- 7.5 V boost regulator for powering the Arduino from the Zumo’s 4 AA batteries.
- Convenient access to Arduino I/O lines, the pin 13 user LED, and the Arduino reset line via the shield.
- General-purpose prototyping areas and an expansion area at the front for connecting additional sensors.
- Compatible with the Arduino Uno R3 and Arduino Leonardo. Can also be used with older Arduinos that have the same form factor, like the Duemilanove.
- Arduino libraries and sample code make getting started easy.
- Detailed user’s guide.
Required Accessories (not included)
- An Arduino. The Zumo Shield works with both the Uno and the Leonardo. It is not compatible with the Arduino Mega or Due, but it can be used with older Arduinos that have the same form factor as the Uno, such as the Duemilanove. (Other Arduino-compatible controllers might work with the Zumo robot, but support for them will be limited and they might require modification; for example, one customer got his Zumo robot working with the Freescale FRDM-KL25Z board.)
- Four AA batteries. The Zumo chassis works with both alkaline and NiMH batteries, though we recommend rechargeable NiMH cells.
- Zumo Shield Libraries
- This collection of libraries and examples for the Arduino makes it easy to program an Arduino-controlled robot built with Pololu’s Zumo Shield or Zumo robot
- Simulink Library for Zumo Robot
- This library can be used to program an Arduino-controlled Zumo through MATLAB and Simulink. It provides driver blocks for all the sensors present on the Zumo Robot as well as example models showing their usage.
- How to program a Zumo robot with Simulink
- This tutorial on the Adafruit Learning System guides you through the process of programming a Zumo robot with Simulink.
- Zumo robot tuning tips
- This article was written by Professor Erich Styger for his class on embedded systems programming at the Lucerne University of Applied Sciences and Arts. It describes various ways to tweak the performance of a Zumo to be more competitive in a Mini Sumo competition. Note that his Zumos use a custom PCB rather than our Zumo shield for Arduino; our shield has a lot of capacitance in parallel with the batteries that generally prevents the “battery inertia” problem Erich describes.
- Freedom Zumo Robot
- This robot is uses our Zumo robot kit, 75:1 micro metal gearmotors, and a Zumo reflectance sensor array. Instead of an Arduino it uses a Freescale FRDM-KL25Z as the microcontroller board, and sample code is available for line following and maze solving. By Erich, March 2013.
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