Well I got sick of trying to build bodies for robots from nothing. So I bought a small toy truck. And built a robot over it. This is the most successful one that I have built so far. It has touch sensors both in front and back. Which lets it reverse to get away from obstacles. And has a light seeking behavior which lets it finds the place in the house where people are hanging at that moment. (room with people = lights open, room without people = lights off).
I have built it as optimized as possible. It runs for about 3 days with duracells. It runs with my humongous 3000 ma nimh batteries for a week before he needs a recharge! The sensors lets him hang around the house without getting stuck. And the hardcore GM2 gearmotors I bought from solarbotics.com helps him to pass over any small obstacle such as cables and funky carpet edges.
I will soon post the circuit and video. It is based on the classic herbie circuit with LM386 but it is modified for the reverse function.
Here is the circuit. The small chip (LM386) is for light seeking. The bigger one (74HC14) lets him reverse and control the information leds. The green led is the charge indicator and the red one flashes while the robot is reversing. The capacitors over there are the reverse caps. And the trimpot on the middle is for adjusting the motor speeds.
I love these GM2 engines.
These are the front sensors, made with tiny buttons.
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