Just a small post on a gap cross robot we had to build for a competition at our hackerspace:
I used a PICAXE 08M2 as the brain. I wanted to use a bigger chip like the 14M2 with a lot of sensors to let the robot detect the edges of the gap and count the number of turns on the winding drum etc. but I realised on this small scale doing everything by timing works just as well. So the board has a couple of transistors to switch the bridge and drum motors and a H-bridge for the drive motors all controlled by the PICAXE. The chassis is a Polulo Zumo and I highly reccomend it. I used a voltage regulator set at 3 V to make sure the motors dont go slower as the batteries went flatter.
"The great divide"
Design and build a robot that can cross a 200 mm gap. (sounds easy)
* Use any technology you see fit (within the rules below)
* Use a button or some form of input to start your robot.
YOU MAY NOT:
* Your robot may not be bigger than 150 mm cubed (150 * 150 * 150 mm ) at the commencement of the challenge.
* Your robot may not leave anything behind.
* Your robot may not have any wires for power or control, it must be self contained and autonomous.
* You may not use a quadcopter, or flying toy or anything that can hover.
THE FIELD OF COMPETITON:
* The field will consist of two blocks 200 * 200 mm placed 200 mm apart.
* Your robot must start 25 mm from all edges.
* Your robot will only be considered as fully crossed when all parts are on the end block.
* If it falls of the edge of either the start block or end block it is a fail.
* There is no time limit to cross the gap.
The only other robot that were in the competition did not work, so I kind of won by default. I am sure with a bit more noodling the other robot would have worked brilliantly and I might not have won...
Good luck I guess..
The enemy: It does look awesome!
Here is a (very short) video of my robot:
Or if I might have messed up the embedded video the url: