Pololu - 3Pi Robot

Complete, high-performance mobile platform Designed for line-following and maze-solving competitions C-programmable Atmel ATmega328P microcontroller 32KB flash memory, 2 KB RAM and 1 KB EEPROM Capable of speeds exceeding 3 feet per second The Pololu 3pi Robot is a complete, high-performance mobile platform featuring two micro metal gearmotors, five reflectance sensors, an 8×2 character LCD, a buzzer, and three user pushbuttons, 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. 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 g/2.9 oz without batteries) and takes just four AAA cells (not included).