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Open loop control for positioning (Difficult task)

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ricky_wcy

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Toys Questions

Condition
1. MCU is masked
2. When I press the button, MCU sends a 1sec pulse via 1 I/O to (transistors circuit) to drive the dc motor

Problem
1. dc motor has +/-15% tolerance, so the motor may stop in different position finally

Question
How can I stop the motor in certain position ?
I put a ON/OFF switch to the position where I wanna motor stop here
When dc motor rotates to switch , the switch condition change from open to short or vice versa

How can I use the switch condition to stop the motor
Any circuit with minimum cost can solve it (Difficult question)
 

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