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Audible warning from IR sensor
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[QUOTE="berkeman, post: 6024390, member: 8921"] So you need a proximity sensor, not an IR beam interruption sensor? Passive IR (PIR) sensors detect movement of thermal objects (like people), but they aren't necessarily used for proximity sensing. Often ultrasound echoes are used for proximity sensing in close. Can you elaborate on what kind of objects you want to sense and how close they will be? [/QUOTE]
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Audible warning from IR sensor
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