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Originally Posted by yongkimleng
In addition, if you're using two seperate motors you'll probably want to include encoders and use PID to keep both motors in constant rpm.
An interesting thing here is that if both wheels are spinning at different rpms, you can actually control the X direction to a certain extent! 
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it's no wonder the robots pictured above (2006 Niagara FIRST Triplets) were codenamed "Beckham" during development.