Re: Heart Beat Counter Circuit
- From: Rich Grise <rich@xxxxxxxxxxx>
- Date: Tue, 12 Dec 2006 01:27:29 GMT
On Sun, 10 Dec 2006 09:28:02 -0800, REmmel8 wrote:
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-
I once worked with a system that used digital filters to recognize a
QRS, and just counted microseconds from one to the next and divided
(to go from rep time to rep rate; scaled, of course. :-) )
I think they kept a running average, so the rate didn't change
abruptly if there was variation in the time from one beat to the
next. Even with that, the display was more like real-time than
what you're suggesting.
However, if you're locked in, here are a couple of answers:
To reset the counter, you just need a timer/counter that issues a
"reset" pulse every 60 seconds.
To connect the counter to a display, you need a binary/BCD converter,
and 7-segment decoder/drivers, and the displays.
Good Luck!
Rich
.
- References:
- Heart Beat Counter Circuit
- From: REmmel8
- Heart Beat Counter Circuit
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