Hi everyone. This is my entry for community contest 11: Chimney. My robot doesn't actually climb. As from the robot has sandwiched itself between the two walls it drives up against gravity. The program is very simple. The two motors just keep turning in one direction. The robot is quite slow. Here you can see how long it takes go up one foot. Start untill the wheels hit the walls. : 14 seconds. from the ground to one foot: 1 minute and 33 seconds. (93 seconds) Total 14 + 93 = 107 seconds. (1 minute and 47 seconds) It goes up approximately 20 centimetres per minute. I have 3(5) videos. vid1 hq.avi video of the robot in action seen from about 1,5 meter high. vid1 low_q.wmv same video but smaller. vid2 hq.avi video of the robot in action seen from the ground. vid2 low_q.wmv same video but smaller. Motor.wmv video of one of the motor in action. Note: The sound in some of the videos doesn't make sense.:) That's it, I hope you like my entry! Laurens Valk (Laurens200), The Netherlands