The bot project is sitting idle no longer - I have replaced a bad photoresistor and tuned the program to improve light detection. This video shows the photovore robot traveling around the perimeter of a wall and autosteering to prevent collision with the wall.
This photovore works by detecting incoming light to two photoresistor sensors, each positioned approximately 45 degrees on opposite sides from a line normal to the robot face. The robot will respond to one of four scenarios: (1) incoming light is approximately the same intensity at both sensors; (2 and 3) light is greater at one sensor than the other; and (4) incoming light is very low at both sensors. In case one, the bot steers straight. For cases 2 and 3, the bot will follow the direction of greater light, and for case 4, motors for both wheels stop running.
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