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

Get Social

Information

Powered by e107 Forum System

Conversation

ExperimenterUK
Thu Oct 30 2014, 06:02 PM
This is a chat box..create a thread if you need help...but we don't do homework
Tue Oct 28 2014, 07:33 PM
vinni
hi rickey...anyone got the pgm...pls gimme now
Tue Oct 28 2014, 06:35 PM
potla
hi vinni even i need that program. help me if you get it
Tue Oct 28 2014, 03:22 PM
vinni
1. Using a look-up table in Flash ROM and accumulator offset indexed addressing mode, write a program that acts as a timer. The timer should count from 0 to 59 seconds. After reaching 59, it should go back to 0 on the next second and continue to count up. The timer should use the seven-segment display. The look-up table should contain information on how to display the digits 0 – 9 on the seven-segment display
Tue Oct 28 2014, 03:22 PM
vinni
hello Rickey..i need this pgm very urgently
Tue Oct 28 2014, 01:42 AM
Boy Donald
Dear sir, thanks before. i have some project urgent for my school and my project need this digital countdown timer using 7 segmen display. but your project only show ten minutes countdown, i need your help, can you show me more to change the minute or set the time manually. thank you, sorry for disturbing you.
Tue Oct 28 2014, 01:32 AM
Boy Donald
dear sir
Tue Oct 28 2014, 01:19 AM
Boy Donald
Rickey you inspired me a lot but why i can not change the time ( minute
Sun Oct 26 2014, 02:51 AM
sandeep bankar
dear sir I m facing problem about..how to read number of incoming call in gsm 900 a. pls help how to read it in atmel avr microcontroller.
ajay_bhargav
Mon Oct 20 2014, 11:22 AM
@skrishna, please post in forum so we can help you better.

Downloads

Comments

prash5054
Thu Oct 30 2014, 06:34 AM
Max.otto
Mon Oct 27 2014, 01:23 PM
toypoy
Sun Oct 26 2014, 01:06 AM
hiswe
Thu Oct 23 2014, 04:18 PM
pddung93
Sun Oct 19 2014, 01:56 PM
msideal
Thu Oct 16 2014, 08:48 AM
robotgirl
Tue Oct 14 2014, 06:23 PM
BRV64
Mon Oct 13 2014, 05:48 AM

Online

Guests: 44, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 37535
Newest member: prash5054
Forum Activity
rkodaganur Avatar
Posted By rkodaganur
Fri Oct 31 2014, 01:44 AM
Hi Ajay, I wanted to know can we use transformer ...
Max.otto Avatar
Posted By Max.otto
Thu Oct 30 2014, 11:09 AM
Hello all, before generating i have to give PWM p...
prash5054 Avatar
Posted By prash5054
Thu Oct 30 2014, 06:40 AM
can u post the updated code for the above problem ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Oct 29 2014, 05:36 PM
Thank you for the feedback.It's good to hear when ...
msideal Avatar
Posted By msideal
Tue Oct 28 2014, 05:34 PM
ExperimenterUK: Thankyou so much for helping me......
msideal Avatar
Posted By msideal
Tue Oct 28 2014, 05:18 PM
thanks ExperimenterUK for your help.... I will try...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Oct 27 2014, 10:29 PM
Your error seems to be the use of PINC, which is f...
msideal Avatar
Posted By msideal
Mon Oct 27 2014, 05:45 PM
i want to extend my i/o's by writing this code. i ...
Max.otto Avatar
Posted By Max.otto
Mon Oct 27 2014, 01:30 PM
Hi all , i am working with PSoC 5LP. I have contin...
gaurav7577 Avatar
Posted By gaurav7577
Mon Oct 27 2014, 09:53 AM
hello everyone i wanna interface blood pressure se...