Pulse Monitor Help

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hello everyone!

i making wireless pulse monitoring project. having difficulties in detection of sensor.
here's link of code i've copied: http://www.jamesrosko.com/2012/01/arduino-pulse-monitor.html

here's questions:
1. distance sensors finger.
2. if 2 sensors across monitoring led turns off?
3. kind of sensor's should use?
4. ok use nellcor max-a pulse oxi clip. has same concept of normal ir led , photodiode. link: http://www.diytrade.com/china/pd/7066705/original_nellcor_disposable_spo2_sensor.html

really need guys.
btw i'm noob in using arduino. have pity on me. , time running project =(.
thanks in advance.

http://www.instructables.com/id/microcontroller-measures-heart-rate-through-finger/

* * *
the guy in instructables using pic, shows how develop signal usable.
* * *
your link didn't provide tech info.


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