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DC motor rotation CW and CCW

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hossam abdo

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Dear friends

I want to know how to control dc motor to rotate in two direction

I have Atmega16, ULN2803 and Relays

thanks in advance
 

godfreyl

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To reverse the motor, you need to reverse the voltage.

The Atmega16 can drive the ULN2803 inputs directly, the ULN2803 can switch the relays, and the relays can switch the motor voltage.
 

FoxyRick

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If you have a DPDT relay, then reversing is easy. Wire like this (the example is for a DPDT switch, but the principle is identical)

motor2.jpg

Then, use a second relay to simply switch on or off the power to the first relay, so that you can stop the motor.
 

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