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This was my first robot last 2008. I've worked on IR LEDs and Detectors to avoid the wall. Its movement is quite slow as it uses only 2 servo motors. Though only two pairs of IR LEDs and detectors, it has fairly good (small) range of vision. I am planning to put an ultrasonic sensor to help it in its movement and detection of obstacles (in this case the wall). The sensors (IR LEDs and detectors) are from my other robot, but the design and circuits are virtually the identical. BoeBot and SumoBots ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/my-first-encounter-of-mcu-and-bots