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[SOLVED] Pulse Oximeter (photodiode,2 leds, msp430)

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grabbo

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Hey i searched for oximeter but this problem hasn't occured on the results.

I build my own sensor using 2 LED's and photodiode. Connected as in schematic attached (one change -> the differential op amp got right now gain only 1 because i dont have any resistors left ).

Im reading the signal so far with oscilloscope (ox3.png). Want to ask if anybody got any experience and can help if i'm doing it correctly.

I will have to filter the signal. Which filter do you suggest to use in this case?Does anybody know any fet input op in DIP package operating on supply voltage (3.3v)?

Ill keep you posted.

EDIT: I found a mistake with ADC12 settings, the output looks better now
 

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  • oximeter_schematic.png
    oximeter_schematic.png
    18.6 KB · Views: 167
  • ox3.PNG
    ox3.PNG
    41.6 KB · Views: 153
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