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The LightRobot is a 3pi Robot that has been modified with RGB LEDs, an RN-41 Bluetooth module, and a sonar range finder that is controlled with voice commands and the accelerometer from an Android phone. The source code for the robot and the Android app are also available on the project’s GitHub page.
Featured link: http://www.youtube.com/watch?v=hJi5qhOgbXw
This blog post is a very detailed writeup of some A4988 stepper motor driver heatsinking experiments.
This post in the Trossen Robotics Community forum shows a pair of Wixels are added to an Arbotix Commander V2 remote control, allowing it to send its signals to a computer. The author gives us a nice compliment:
Not to be a shill, but that was easier to set up than any MCU + Xbee configuration I’ve seen.