Heart Beat Sensor

thanks for the info! i am just finding one of those... :-)

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

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

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.

good search abbas

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?

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.

Ûž TPS Ûž

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

Thanks

Circuit does not explain the type of LDR, so you can probably try with any best available LDR in market.

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....