mates, how can we control a reversible motor of its rotation? im using this kind of motor

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You simply reverse the connections to it, use either a relay or an H-bridge.

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like id like to rotate for only 90 degrees?

 

Not easy with a DC motor, you would need to gear it down substanially, then have some kind of sensor to detect it's position (possibly as simple as a limit switch?).

This sort of application is probably more suited to a stepper or servo, depending what you are trying to do?.

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I have a Futaba 4channel airplane controller and 4 servos' I bought them for $200 dollars I'll sell for $85. They are in perfect condition . email me at BriceBolse116@hotmail.com