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Pololu 3pi Robot

The Pololu 3pi robot is a complete, high-performance mobile platform featuring two micro metal gearmotors, five reflectance sensors, an 8x2 character LCD, a buzzer, and three user push buttons, all connected to a C-programmable ATmega328 microcontroller. Capable of speeds exceeding 3 feet per second, 3pi is a great first robot for ambitious beginners and a perfect second robot for those looking to move up from non-programmable or slower beginner robots.
Ideal for Internet of Things (IoT) applications.

Pololu 3pi Robot - a complete, high-performance mobile robot platform
Part No. Description Price Stock
Pololu 3pi Robot a complete, high-performance mobile robot platform $99
∗ Standard lead time is 1 week

The 3pi robot is designed to excel in line-following and maze-solving competitions. It has a small size 9.5 cm (3.7") diameter, 83 grams (2.9 oz) without batteries) and takes just four AAA cells (not included), while a unique power system runs the motors at a constant 9.25 V independent of the battery charge level. The regulated voltage allows the 3pi to reach speeds up to 100 cm/second while making precise turns and spins.

The 3pi robot makes a great platform for people with C programming experience to learn robotics, and it is a fun environment for ambitious beginners to learn C programming. At its heart is an Atmel ATmega328P microcontroller running at 20 MHz. 3pi robot features 32 KB of Flash program memory, 2 KB RAM, and 1 KB EEPROM. The popular, free GNU C/C++ compiler works perfectly with the 3pi, Atmel's AVR Studio provides a comfortable development environment, and an extensive set of libraries provided by Pololu makes it a breeze to interface with all of the integrated hardware. We provide a number of sample programs to show how to use the various 3pi components, as well as how to perform more complex behaviors such as line following and maze solving.

Required Accessories
An external AVR ISP programmer, such as our USB AVR programmer is required to program the 3pi. We offer a combination deal that includes a 3pi robot, USB AVR programmer, and USB cable.

The 3pi is powered by 4 AAA batteries (not included). We recommend rechargeable NiMH cells non-rechargable batteries will also work.

Optional Accessories
We offer various peripheral expansion boards to add your own custom electronics or connect other BiPOM boards to the robot. One expansion kit features cutouts that let you view the LCD below and allow you to reach the power button, reset button, and ISP programming header on the base. The other three expansion kits have no cutouts and instead replace the LCD, giving you access to more I/O lines and more prototyping space.


  • Size: 3.7" diameter
  • Processor: ATmega328P
  • Motor driver: TB6612FNG
  • Motor channels: 2
  • User I/O lines: 2
  • Minimum operating voltage: 3V
  • Maximum operating voltage: 7V
  • Maximum PWM frequency: 80 kHz
  • Reverse voltage protection
  • External programmer required