[time-nuts] Off topic project sort of heart rate monitor NEED BEATS PRE MINUTE TO ANALOG VOLTAGE
paulc at snet.net
Tue Feb 19 19:58:04 EST 2013
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.
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