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.

libpololu-avr
.............\devices
.............\.......\atmega168
.............\.......\.........\Makefile
.............\.......\atmega328p
.............\.......\..........\Makefile
.............\.......\atmega48
.............\.......\........\Makefile
.............\.......\Makefile
.............\.......\template.mk
.............\examples
.............\........\atmega168
.............\........\.........\3pi-demo-program
.............\........\.........\................\3pi-demo-program.aps
.............\........\.........\................\Makefile
.............\........\.........\................\test.c
.............\........\.........\3pi-linefollower
.............\........\.........\................\3pi-linefollower.aps
.............\........\.........\................\Makefile
.............\........\.........\................\test.c
.............\........\.........\3pi-linefollower-pid
.............\........\.........\....................\3pi-linefollower-pid.aps
.............\........\.........\....................\Makefile
.............\........\.........\....................\test.c
.............\........\.........\3pi-mazesolver
.............\........\.........\..............\3pi-mazesolver.aps
.............\........\.........\..............\bargraph.c
.............\........\.........\..............\bargraph.h
.............\........\.........\..............\follow-segment.c
.............\........\.........\..............\follow-segment.h
.............\........\.........\..............\main.c
.............\........\.........\..............\Makefile
.............\........\.........\..............\maze-solve.c
.............\........\.........\..............\maze-solve.h
.............\........\.........\..............\turn.c
.............\........\.........\..............\turn.h
.............\........\.........\3pi-serial-master
.............\........\.........\.................\3pi-serial-master.aps
.............\........\.........\.................\Makefile
.............\........\.........\.................\master.c
.............\........\.........\3pi-serial-slave
.............\........\.........\................\3pi-serial-slave.aps
.............\........\.........\................\Makefile
.............\........\.........\................\slave.c
.............\........\.........\analog1
.............\........\.........\.......\analog1.aps
.............\........\.........\.......\Makefile
.............\........\.........\.......\test.c
.............\........\.........\analog2
.............\........\.........\.......\analog2.aps
.............\........\.........\.......\Makefile
.............\........\.........\.......\test.c
.............\........\.........\buzzer1
.............\........\.........\.......\buzzer1.aps
.............\........\.........\.......\Makefile
.............\........\.........\.......\test.c
.............\........\.........\buzzer2
.............\........\.........\.......\buzzer2.aps
.............\........\.........\.......\Makefile
.............\........\.........\.......\test.c
.............\........\.........\buzzer3
.............\........\.........\.......\buzzer3.aps
.............\........\.........\.......\Makefile
.............\........\.........\.......\test.c
.............\........\.........\hex_files
.............\........\.........\.........\3pi-demo-program.hex
.............\........\.........\.........\3pi-linefollower-pid.hex
.............\........\.........\.........\3pi-linefollower.hex
.............\........\.........\.........\3pi-mazesolver.hex
.............\........\.........\.........\3pi-serial-master.hex
.............\........\.........\.........\3pi-serial-slave.hex
.............\........\.........\.........\analog1.hex
.............\........\.........\.........\analog2.hex
.............\........\.........\.........\buzzer1.hex
.............\........\.........\.........\buzzer2.hex
.............\........\.........\.........\buzzer3.hex
.............\........\.........\.........\lcd1.hex
.............\........\.........\.........\lcd2.hex
.............\........\........

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