The Pololu 3pi robot is a small, high-performance, autonomous robot designed to excel in line-following and line-mazesolving

competitions. Powered by four AAA batteries (not included) and a unique power system that runs the motors at

a regulated 9.25 V, 3pi is capable of speeds up to 100 cm/second while making precise turns and spins that don’t vary

with the battery voltage. This results in highly consistent and repeatable performance of well-tuned code even as the

batteries run low. The robot comes fully assembled with two micro metal gearmotors, five reflectance sensors, an 8×2

character LCD, a buzzer, three user pushbuttons, and more, all connected to a user-programmable AVR microcontroller.

The 3pi measures approximately 3.7 inches (9.5 cm) in diameter and weighs 2.9 oz (83 g) without batteries.