[time-nuts] Off topic project sort of heart rate monitor NEED BEATS PRE MINUTE TO ANALOG VOLTAGE

Tom Van Baak (lab) tvb at leapsecond.com
Wed Feb 20 01:56:17 UTC 2013


Paul,

I use a picPET (http://leapsecond.com/pic/) to measure heart rate and stability; the original 1PPS...  The idea is simply to time-stamp every beat and then convert that raw data to rate or period or moving average rate, etc. 

/tvb (iPhone4) LA

On Feb 19, 2013, at 4:58 PM, Paul Cianciolo <paulc at snet.net> wrote:

> Hello Folks,
>  
> I am working on a project intended to convert an analog ECG signal to a voltage proportional the heart rate,
> The actual electrodes instrumentation amp is pretty much working fine  so no worries there.
>  
> The problem is, and here is where the relationship to time nut comes in.
> The signal output from the instrumentation amplifiers will be at a rate of approx 60 BPM or pulses, up to perhaps 90 BPM.
>  
> The purpose of this apparatus is to print a rolling chart on the screen of a computer of heart BPM and then try different technicues of meditaion  and calming technicues to lower my heart rate for short periods of time.
>  
> My first tthought was a frequency to voltage IC like the LM2907 or the 2917 but I get the impresiion from the data sheets that these chips will not work at these very low  1 Hz applications,
>  
> Then I thought maybe one of the frequecy counters could be configured as a rate meter and output a proportional voltage I need.
> No luck here either. 
> Te latter components seem tobe somewhat time relatedand that is why I posted here.\\
>  
> Thank you for reading this and for any suggestions you folks might offer.
>  
> PaulC
> W1VLF
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> 1Hxz
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