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Looking for photoswitch schematic

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dpechman

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photoswitch schematic

Hello guys,
i need a Photoswitch schematic (analogic part). some one have an ideia?
to detect some body at 1 meter aprox. by reflective metod.
tks,
Daniel
 

House_Cat

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For a wide variety of ideas, go to the search engine at www.google.com and enter 'ir object detector schematic'. You will get several pages of ideas.

You didn't say if you wanted to detect only moving objects with the reflected IR. If so, look a the schematic attached below.

The circuit on the left is the transmitter circuit that establishes a 5 kHz modulated infrared beam. The schematic of the receiver circuit shows a resonance-tuned narrowband amplifier that reduces the detector's sensitivity to stray light. C1 and L1 in IC2A's feedback loop cause the op amp to pass only those frequencies at or near the LED's 5 kHz modulation rate. IC2B's output increases when the received signal is sufficient to drop the negative voltage across C2 below the reference set by R2. The output of this circuit is then attached to some load resistance, which can be an alarm circuit or an LED.
 

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