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This robot normally goes around avoiding obstacles and (sometimes) edges until its batter drops low. Then the robot goes towards a 38khz pulse instead of away from eat, leading it to its charging station. The robot will have an rf transmitter within the next two weeks which transmits when its battery is low to the IR beacon, so it can turn on. The edge detector only works sometimes because the motors are too fast for the robot to respond and the sensor isnt mounted far enough to the front. The video ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/picaxe-08-charging-robot