Discussion in "General help Guidance and Discussion" started by    xmen    Feb 17, 2008.
Mon Oct 06 2008, 08:23 am
#11
thanks for the info! i am just finding one of those... :-)
Mon Oct 06 2008, 12:12 pm
#12


you can also get a heart beat sensor from here :

http://www.sunrom.com/index.php?main_page=product_info&products_id=556&currency=INR


Arun
Mon Jan 26 2009, 08:22 pm
#13
can you explain how LED and LDR can help to detect heart beat?
Mon Jan 26 2009, 09:24 pm
#14


can you explain how LED and LDR can help to detect heart beat?

Aarthi



I think that has been pretty well explained in one of the preceding post by abbas in this very thread itself.
Mon Jun 29 2009, 08:23 am
#15
good search abbas
Fri Nov 06 2009, 05:43 pm
#16
I have built this circuit and it is not giving the correct output. it goes too high or too low even with the slightest movments and always starts with '141'. can someone help?
Fri Nov 06 2009, 06:28 pm
#17
The above circuit needs a lots of calibration for different people fingers. it does not work well if we shake our finger a little. i think sunrom's sensor is good one it works very well and no calibration needed .but it is a bit costly.


[ Edited Fri Nov 06 2009, 06:29 pm ]
Sun Jan 24 2010, 07:45 pm
#18



Ûž TPS Ûž




What type of LDR can be used?.
What are the specifications of the LDR more convenient?

Thanks
Mon Jan 25 2010, 06:20 pm
#19
Circuit does not explain the type of LDR, so you can probably try with any best available LDR in market.
Sat Apr 16 2011, 11:37 pm
#20
Hey i am using the same ckt but not getting results....
so plz tell me in the given ckt what the role of 470nF capacitor....??
and plz tell me what are the waveforms at
1. Across LDR
2. At pin 3
3. At pin 1
4. At pin 7


Thanks....

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