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Old 02-23-2012, 10:37 AM   #1
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Default Discussion: Heart rate measurement from fingertip. Part 1. Schematic

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Introduction Heart rate measurement indicates the soundness of the human cardiovascular system. This project demonstrates a technique to measure the heart rate by sensing the change in blood volume in a finger artery while the heart is pumping the blood.
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Old 02-23-2012, 10:37 AM   #2
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How to increase the max. Measurable heart rate than 150
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Old 02-24-2012, 12:42 PM   #3
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please can u answer me about the Alternative of the ic u used that i cannot find it in my country .....
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Old 02-26-2012, 10:36 PM   #4
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MCP602 - 2-Ch Op Amp - LMV358 or MCP603/MCP604 - 4-Ch Op Amp.
PIC Microcontroller - PIC16F628A - you can use PIC16F84, but you need to change the firmware...
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Old 02-29-2012, 06:17 PM   #5
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Originally Posted by Vadzz View Post
MCP602 - 2-Ch Op Amp - LMV358 or MCP603/MCP604 - 4-Ch Op Amp.
PIC Microcontroller - PIC16F628A - you can use PIC16F84, but you need to change the firmware...
thanx Vadzz
please can u tell me how to increase the range of pbm that could be sensed than 150 ...
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Old 03-06-2012, 05:02 PM   #6
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ok can i use lm358 insted of lmv358?????????????
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Old 03-09-2012, 07:50 PM   #7
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Originally Posted by Allam88 View Post
ok can i use lm358 insted of lmv358?????????????
LMV358 - Dual General Purpose, Low Voltage, Rail-to-Rail Output Operational Amplifier

and

MCP602
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Old 06-02-2015, 04:26 PM   #8
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in the schematic why u have connected base of BC547 to pin RA3?
if we are using pic16f877a then where we connect base of BC547?
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Old 06-03-2015, 09:08 AM   #9
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Base of BC547 connected to port RA3 (PIC16F628A pin 2: RA3/AN3/CMP1). This is IR transmit circuit.

If you use PIC16F877A - connect base of BC547 to pin 5 (RA3/AN3/Vref+).
In general, the base of the transistor can be connected to any port, but not forget to make the appropriate changes in program.
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Old 06-03-2015, 02:55 PM   #10
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thanx ...i am using two led's IR and RED,and to drive that giving delay to both the leds,so what are the pins i can use? can i use PORT E pins also?and i have to give delay at base of BC547 OR other end of led?
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