Re: Heart Beat Counter Circuit
- From: martin griffith <mart_in_medina@xxxxxxxx>
- Date: Sun, 10 Dec 2006 19:11:34 +0100
On 10 Dec 2006 09:28:02 -0800, in sci.electronics.design
REmmel8@xxxxxxxxx wrote:
Hi All,you didnt spec accuracy :-)
I am in DESPERATE need of some advice here. I am working on a project
for my basic electronics design class. Here is what I need to do...
Design a heartrate counter that
-uses 2 electrodes as the signal source, removes high frequency noise
- counts pulses for 15 seconds every minute
- displays the per minute heart rate for 45 seconds on a three-digit
digital display
- reset the count every 60 seconds and restart the counter
So far, I've got a heart rate pulse going into the counter for 15
seconds every minute. For the other 45 seconds of the minute, nothing
feeds into the counter. (This was done using filters, a comparator, a
15 second astable multivibrator, 2 bit counter, nor gate, and an and
gate)
So right now I need to figure out how to:
- reset the counter every 60 seconds
- connect the counter up to a three-digit digital display
I would be SO GREATFUL if someone could help me out with the counter
reset and display portion of this-
Thanks!
Rachel
rough idea
555, at a 15 sec count
binary up counter 74 or CD4000 series
74hc138 will decode the lowest 3 lines of the counter into induvidual
lines
Thats a start, what would you do next?
martin
.
- References:
- Heart Beat Counter Circuit
- From: REmmel8
- Heart Beat Counter Circuit
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