This sound-following 3pi robot uses three Electret microphone breakout boards and two 74HC4052 multiplexers. Here is a video of the robot in action:

For more details, see this thread on the Pololu forum.

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Waiter Robot can make a “Robot Bar” for your next exhibition, show, private event, or sales promotion. They use Pololu 3pi Robots to deliver food and drinks in an remarkable way. Update: The original site for this project is no longer accessible, so we have removed the link.

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Pololu 3pi Robot

This video shows a heavily-modified 3pi that uses distance sensors and encoders along with a flood-fill algorithm to find the shortest path through a walled Micromouse maze. The robot is described in more detail in this forum post.

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Pololu 3pi Robot

This excellent guide from C.I.r.E. (Club de Informática, robótica y Electrónica) shows in detail how to build a fast (> 2 m/s) line-following robot from scratch, and it makes use of a number of Pololu products.

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This project by Kazuhiro Ouchi (in Japanese) shows a 3pi robot with an ARM mbed controlled by Bluetooth keyboard.

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Customer Ana Paula Almeida wrote this Portuguese-language paper about the 3pi Robot (1MB doc) as part of a Master’s program in Computational Modeling and Industrial Technology. The paper describes the 3pi in general and specifically how to write optimized maze-solving code.

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Pololu 3pi Robot

This mbed.org cookbook page will help you get started using your m3pi robot with an mbed development board as your high-level robot controller.

Featured link: http://mbed.org/cookbook/m3pi

AIRbot is a robot that can be controlled by a cellphone and can send images back to the cellphone. It uses a yellow RP5 tracked chassis, a transparent clear RP5 expansion plate, and a qik 2s9v1 dual serial motor controller along with the AIRcable S.D.K. and the AIRcable OptiEyes. The source code (both AIRcable and Nokia) and circuit diagrams are freely available.

Featured link: http://wiki.opensensors.org/airbot

In this project, an HD camcorder sits on a pan/tilt mount controlled by a Micro Maestro 6-Channel USB Servo Controller. A Wiimote is used to track an IR light source. Here is a video taken from the mounted camcorder:

Featured link: http://helifreak.com/showthread.php?p=1868143#post1868143

In this video, Meindert Norg from Norg Consulting demonstrates his active magnetic bearing, Tripod Floater. The closed-loop system uses three Pololu 18v15 high-power motor drivers as PWM amplifiers to power the magnetic coils that keep the module floating beneath the metal plate.

February, 2010 update: the Tripod Floater is now wireless:

Featured link: http://www.youtube.com/watch?v=e-f_H68Rl4g