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·         If I was to do this project again I would defiantly run lower ratio gearbox maybe ratio 103:1 so it’s a bit quicker ,also run a 9 volt battery for the motor controller, to gain faster speed from the motors .Also have a rubber front edge just in case it hits the wall it doesn't make any sound at all. I would recommend the ultra sonic sensors as I had found them to be very reliable and quick and easy to adjust, but they are quite pricey that the only thing, but they work well. Also I would spend heaps of time adjusting the timing with a higher voltage  an current going to the motors so they will be harder to tune an fine adjust. Otherwise I was very happy with how my robot Z-BEAST ran that night.