Discussion in "General help Guidance and Discussion" started by    xmen    Feb 16, 2008.
Sat Feb 16 2008, 09:19 PM
#1
hi.........i need sensor to detect our heart beat .... anything available please guide me.......


[ Edited Wed Feb 27 2008, 06:21 AM ]
Mon Feb 25 2008, 08:14 PM
#2
use super bright led and LDR
Tue Feb 26 2008, 09:01 AM
#3
hi TPS, can you explain how LED and LDR can help to detect heart beat?
Sun Mar 02 2008, 06:10 PM
#4


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

Ajay


Mon Mar 03 2008, 07:46 PM
#6
curtsy binu


[ Edited Mon Mar 03 2008, 07:47 PM ]
Tue Mar 04 2008, 05:46 PM
#7
thank you TPS
and... i hope binu has no problem with sharing his circuits
Tue Mar 04 2008, 07:19 PM
#8
YES I hope so
Tue Mar 04 2008, 07:51 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, 09:19 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

Tags working heartbeat sensorIR based heart beat sensorheartbeat sensor using infrared LED

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Wed Jul 01 2015, 05:14 PM
ShubhamBansal1996
i am making a project of connecting 4 8051's using a can bus for which i am using mcp2515 and mcp2551.but before making it i want to ensure it works by simulating it on proteus though the two ic's mentioned above dont seem to have models in proteus so is there anyone who can help me with that
ExperimenterUK
Tue Jun 30 2015, 05:24 PM
@sachinmm The 8051 timer can't do 1 second. It can do 50ms so count 20 times
sachinmm
Sat Jun 27 2015, 05:01 AM
how calculate 1 second delay in 8051 by using timer and what value should be store in TH0 & TLO register??
sachinmm
Fri Jun 26 2015, 08:25 AM
hello sir plz tell me how to know the 74HC165 parallel in serial out ic is fauty or not?
Wed Jun 24 2015, 08:24 AM
ben mutuku
How can one use XOR gate to ensure the first output is '1' and the next is '0'?
ExperimenterUK
Wed Jun 17 2015, 01:37 AM
@baz..try adding a hash and a semi colon
Sun Jun 14 2015, 06:31 AM
baz
@ExperimenterUK no..i dont do that i just type message example.. Hello my name is baz and then i click send message,
ExperimenterUK
Sun Jun 14 2015, 01:55 AM
@baz..did you end your message with a hash and a semi colon
Sat Jun 13 2015, 06:48 PM
asif Jamadar
I want the program for v/f control technique of 3 phase induction motor
Sat Jun 13 2015, 07:06 AM
baz
@ExperimenterUK okay thank you...but now I already complete and my dot matrix already light up but when i send message from pc to my hardware project it doesnt show any message on my dot matrix..its only blinking when i click send message....I really dont know whats the problem...I had follow all the steps...schematic and use the coding that have been provided..is it because firstly i had wrong burn the coding in AT24C16?? Is that effect ????

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