Heartbeat counter and temperature monitor using 89S52

[Davechika]

Please can someone help me a c/c++ code for detecting and counting heartbeat. the input signal comes from P3.4 (timer 0 interrupt input ) of 89S52 microcontroller.

[ikalogic]

Please can someone help me a c/c++ code for detecting and counting heartbeat. the input signal comes from P3.4 (timer 0 interrupt input ) of 89S52 microcontroller.

the signal is analog2677 digital2677 what is the waveform like2677 where is it coming from2677

[Davechika]

the signal is coming from LM358 opamp used to amplify the heartbeat pulses using LDR and LED

[Davechika]

my project,it measures heartbeat using LDR an an LED light source, the analog signal is the amplified by the Opamp LM358 which is the fed to pin P3.4 of the microcontroller which outputs it to the serialbuffer SBUF,please can u help me with a C/ C++ code for this project.

[Davechika]

Here is the full desciption of the Project,

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 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 of the Opamp will generate an interrupt to the controller AT89S52.

Thanks for your anticipated Response

[ya1gaurav]

does it work properly267926792679267926792679

[Davechika]

yeah the circuit really senses the pulses when your hand is placed in between the led and the ldr sensors

[ya1gaurav]

instead of using RS232 in the circuit to interface with PC,,,,can't we just use LCD or 7-segmenr display which would show the count of heartbeat,,,,,2679267926792679

[ikalogic]

instead of using RS232 in the circuit to interface with PC,,,,can't we just use LCD or 7-segmenr display which would show the count of heartbeat,,,,,2679267926792679

sure.. why not2679

[ya1gaurav]

actually i m planning to make this working model,,,has this circuit been tested267926792679 whether it gives optimum values,,,,,26792679or it requires some modification26792679

[pranu]

yeah the circuit really senses the pulses when your hand is placed in between the led and the ldr sensors

Hi.. I am also trying to sense the pulses using an led-ldr, but it somehow doesn't seem to work. I've spent a month trying to test it. Could you please send me the details of your circuit... My id is pranu.littlemermaid@gmail.com

[ya1gaurav]

k m gonna try this circuit,,thnx,

[Davechika]

@pranu,got ur mail,i will send the details of my LED/LDR sensing values and parts to you,all you need is to write a good code to count the pulses per minute:my mail is chez_projects@yahoo.com

[ya1gaurav]

pl. send detalis to me also.....at ya1gaurav@gmail.com thnx..

[staregypt]

This kind of application much often intrigued me, how is your circuit performs in resolution and accuracy2681 Does the output of lm385 is a analog wave that its threshold detected by T1 of mcu2681 The circuit looks so simple for the heartbeat part!!