Discussion in "General help Guidance and Discussion" started by    xmen    Feb 16, 2008.
Sat Feb 16 2008, 04:19 PM
#1
hi.........i need sensor to detect our heart beat .... anything available please guide me.......


[ Edited Wed Feb 27 2008, 01:21 AM ]
Mon Feb 25 2008, 03:14 PM
#2
use super bright led and LDR
Tue Feb 26 2008, 04:01 AM
#3
hi TPS, can you explain how LED and LDR can help to detect heart beat?
Sun Mar 02 2008, 01:10 PM
#4


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

Ajay


Mon Mar 03 2008, 02:46 PM
#6
curtsy binu


[ Edited Mon Mar 03 2008, 02:47 PM ]
Tue Mar 04 2008, 12:46 PM
#7
thank you TPS
and... i hope binu has no problem with sharing his circuits
Tue Mar 04 2008, 02:19 PM
#8
YES I hope so
Tue Mar 04 2008, 02:51 PM
#9
just one thing now.. how putting this sensor on finger can detect heart beat?
what is connection of heart beat with IR sensor? :-s
Tue Mar 04 2008, 04:19 PM
#10


Heart beat is sensed by using a high intensity type LED and LDR. The finger is placed between the LED and LDR. As Sensor a photo diode or a photo transistor can be used. The skin may be illuminated with visible (red) using transmitted or reflected light for detection. The very small changes in reflectivity or in transmittance caused by the varying blood content of human tissue are almost invisible. Various noise sources may produce disturbance signals with amplitudes equal or even higher than the amplitude of the pulse signal. Valid pulse measurement therefore requires extensive preprocessing of the raw signal.
The new signal processing approach presented here combines analog and digital signal processing in a way that both parts can be kept simple but in combination are very effective in suppressing disturbance signals. The setup described here uses a red LED for transmitted light illumination and a LDR as detector. With only slight changes in the preamplifier circuit the same hardware and software could be used with other illumination and detection concepts. The detectors photo current (AC Part) is converted to voltage and amplified by an operational amplifier (LM358). Output is given to another non-inverting input of the same LM358; here the second amplification is done. The value is preset in the inverting input, the amplified value is compared with preset value if any abnormal condition occurs it will generate an interrupt to the controller AT89C2051.

binu

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ajay_bhargav
Sat Aug 30 2014, 12:15 PM
@sufiyan, You can use solenoid lock in place of LED.
Fri Aug 29 2014, 12:17 AM
sufiyan
please can you tell me which type of lock activator should i connect in place of LED? can i use selenoid lock actuator
ajay_bhargav
Thu Aug 28 2014, 06:34 AM
Please post questions in forum
Thu Aug 28 2014, 01:44 AM
yednekachew
can you give a project made bay proteus software
Mon Aug 25 2014, 07:12 AM
Vinod Soni
Hi Sir, How can i make this RFID with ATMega16/32 controller
pavanjain
Sat Aug 23 2014, 05:10 AM
Sir i want to download the hex file in P89v51rd2 microcontroller using max232 IC but we not load the program in IC
Tue Aug 19 2014, 04:51 PM
allen ndumu
please i will like to know if the problem of speed control of dc motor using keypad and l298 was if yes can i have the complete project send it to the address i really need to see it
Tue Aug 19 2014, 10:47 AM
Amit Bisht
sir i want to have some trending projects on which i could work related to ATmega 16 microcontroller
ExperimenterUK
Sat Aug 16 2014, 04:16 PM
@diligent . create a thread
Sat Aug 16 2014, 03:17 PM
diligent
in assembly langauage programming..

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Peter_Parker Avatar
Posted By Peter_Parker
Mon Sep 01 2014, 06:19 PM
Just to add to this,I've connected this now to a C...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Sep 01 2014, 07:28 AM
Which RFID module are you using? Post link to the ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Sep 01 2014, 07:28 AM
We prefer to use English language on our forums. B...
bobparihar Avatar
Posted By bobparihar
Mon Sep 01 2014, 06:33 AM
i am using a RFID module, i want to connect reader...
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Posted By ajay_bhargav
Sat Aug 30 2014, 12:03 PM
Forgot to attach files. This has source for both R...
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Posted By ajay_bhargav
Sat Aug 30 2014, 11:56 AM
I found a very good working source but its for PIC...
siddique Avatar
Posted By siddique
Sat Aug 30 2014, 03:34 AM
Have you tried using the TX setup to receive and v...
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Posted By ExperimenterUK
Thu Aug 28 2014, 03:31 PM
So, I don't think there is any need to load any da...