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magician chassi

2WD Car Driving in circles

Hi!

I've just mounted a magician robot, using Dagu's magician chassis and Dagu magician controller. By runing the simple code that follows, it walks in circles, while it should be walking straight in line. I guess one of the motors is being faster than the other. Is this normal?

http://www.robotshop.com/content/PDF/manual-rs015.pdf

http://www.robotgear.com.au/Product.aspx/Details/548

 

Regards