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Originally Posted by sanddrag
When I say ground I was referring to negative - the black wire. Anyway, these relays you all mentioned, are they able to switch back and forth really fast, like fast enough for a two wheeled balancing vehilce?
BTW - it is a 24 volt system.
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Relays are available in 24 volt as well but no, they are not fast enough to get balance. For that type of servo system, you need some sophisticated drive amplifiers and special motors. The overall system needs to have relatively quick response and the motors need to have relatively fine control (i.e. optimized brush/commutator for the rotational accuracy) or have a well designed gear box capable of rapid changes in direction without tearing themselves apart.