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More  Driver CircuitsMotor Controls H-Bridge Circuits

Alternating CW & CCW Motor Driver
 

A while back a company needed a motor controller for a custom door latching system.  The system used a small brush motor with a speed reduction gear to both latch and unlatch the door.  When pulsed for about 250ms in the clockwise direction, the motor would unlatch the door.  When spun in the opposite direction for 250ms, it would latch the door. The circuit below performs this function.  A single low power pushbutton is used to alternate between the two directions.  The circuit is powered by 4.5v using a battery made from three alkaline AA cells.  The motor draws about 250ma. The battery should provide many years of service.

Click on Drawing Below to view PDF version of Schematic

More  Driver CircuitsMotor Controls H-Bridge Circuits

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