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Author Topic: Photo detector  (Read 1376 times)
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chinninitin
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« on: March 19, 2009, 10:42:16 10:42 »

Hi,
     Please any one help me with good schematic circuit for detect Light of pulsing LED and give TTL output. 
     Actual application is I need to detect and count pulses from LED (Imp/Kwh) on Energy meter.

Thank you,
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Chinni
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microkid
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« Reply #1 on: March 19, 2009, 01:40:22 13:40 »

Hai

Instead of using photo sensor

why cant you try a optocoupler? like 817 etc.

MicroKid
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chinninitin
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« Reply #2 on: March 20, 2009, 03:14:35 15:14 »

Thanks for reply, 
but what I need to do is,  there will be one blinking LED (normally red) and I need to detect and count those pulses.

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Chinni
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falcon _bd
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« Reply #3 on: March 20, 2009, 03:36:41 15:36 »

Try this with a LDR
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gogo246
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« Reply #4 on: March 27, 2009, 08:31:43 08:31 »

If your meter ic gives pulses/frequency as energy consumed then just use frequency counter ckt for it. else use IR LED and IR Detector used in Remote Control.
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