Help - Proximity alarm

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Steeeve

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I would like to build two circuits, where if one comes within 2m of the other a buzzer will sound anyone have any Ideas on how i could do this?
 
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They wouldn't work

All the sensors there are mainly to detect motion, i need to detect when a specific object is a certain distance away.
Thanks anyway
 
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If its always going to be a set distance, and its not too far, you could consider using a InfraRed module with logic output, to make some IR Break beams.
 
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