photo detector circuit

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renaissances21

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Hi,

I'm trying to design a photo detector circuit. Can anyone share with me how the circuit will look like? I just want a simple photo detector that when leds shine light on the finger and photo detector detect and give reading of human pulse.
 
A pulse oximeter looks at O2 levels in the blood using a fingertip device that includes LEDs. I think it also provides a pulse rate. You might google on pulse oximetry to get some ideas.
 
ok..i have seen some ckts like this.. the skin(or blood?) reflects IR , and the reflected intensity depends upon the blood beneath the skin . so u can build an IR diode + phototrans as the detector and monitor the amplified signal from the phototrans
 
renaissances21 said:
Hi,

I'm trying to design a photo detector circuit. Can anyone share with me how the circuit will look like? I just want a simple photo detector that when leds shine light on the finger and photo detector detect and give reading of human pulse.
Click to expand...

Try having a look at **broken link removed** which shows a PIC based one. The actual sensor part looks like this:
 

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