Need help for a heartbeat detector!

[audioguru2]

Hi Fate,
TTL counter ICs require the voltage from a logic low source to be 0.8V or less. The output of a 741 opamp won't go that low, probably 1.0V or more. The other opamps have outputs that go down to within millivolts from ground.

I lost the whole article but the PIC was probably used as a pulse counter with a 1 minute timebase.

 

[Fate]

PIC?? ???

 

[audioguru2]

Hi Fate,
A PIC is a microcontroller that you must program like a computer to do counting and display multiplexing. You could use many separate oscillator, counter and gate ICs instead.

 

[Guest]

hi all,

were should i get the light screen?? and were to put d finger?

 

[audioguru2]

Hi Bird,
Go and see one at a drugstore (chemist?).

 

[Guest]

drugstore?? dun understand... i constructed d circuit..anyway i cant get wat it suppose to be.. i test d heartbeat using oscilloscope.. i oso dunno how many value should i put on both potentiometer

 

[audioguru2]

Hi Bird,
Here's the entire project with pics and adjustment explanations:
http://private.addcom.de/KeithWilson/Projects/hemon.htm

Her's a pic from there showing a light-screen and where a finger is placed:

View attachment 36663

 

[audioguru2]

Hi Guys,
Here's some details about this project:

View attachment 36667

 

[Fate]

Hey bird... Did ya build the exact same circuit???

 

[Guest]

i just built the heartbeat detector circuit.. not include the display part.. bcos i 1 to analyze the signal 1st.. and the Q&A was correct bcos i tried to get the signal b4 instal the light screen but it's hard to realy c d led off n on according to the heart blood pumping.. so now im workin on it n i wil tell d result wen i done k?

 

[MP1]

birdbird, will you please quit writing in code. There are members of this community who do not speak English as a first language. Interpreting your posts is impossible to these guys.

MP

 

[Guest]

sorry :-X :-[

 

[Arun Bansal]

Hi,
I am new in this project
and I need your help
I wana to make project on heart beat monitor by LCD interfaceand PC interface

 

[Guest]

what platform you wish to use? My project was a success although it's quite sensitive to the lights due to lack of intensity of the LED.. I strongly advise you to buy the LED according to or higher than the density stated on the circuit