Building a Counter for HeartBeat

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Discussion Overview

The discussion revolves around designing a heartbeat counter using limited electronic components. Participants explore methods to count heartbeats and display the results on 7-segment displays, specifically addressing the challenge of refreshing the output every 15 seconds while converting the count to beats per minute (bpm).

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant describes their setup involving a precision rectified heartbeat signal converted into a square wave, and expresses the need to count these square waves using a 4029 Up/Down counter.
  • Another participant suggests moving the discussion to a more relevant section, indicating a lack of expertise in electronics.
  • A different participant proposes an alternative approach using a 64-bit shift register that updates every 0.234 seconds to count the "1" bits over a 15-second interval.
  • The original poster responds to the shift register suggestion by listing the specific components they can use, indicating uncertainty about incorporating a shift register into their design.
  • The original poster confirms their intention to use the 4029 CMOS Up/Down counter along with an LED driver for the display, seeking ideas that fit within their component limitations.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to solve the problem. Multiple competing views and suggestions remain, with some participants unsure about the feasibility of proposed solutions.

Contextual Notes

The discussion is limited by the specific hardware components available to the original poster, which may restrict the proposed solutions. There are also unresolved questions regarding the timing and counting mechanisms needed to accurately display heartbeats in bpm.

Who May Find This Useful

Individuals interested in electronics, particularly those working with counters, display systems, or heartbeat monitoring projects, may find this discussion relevant.

tenacity2986
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I have limited hardware components I can use for this obstacle. Let's say I have precision rectified the input heartbeat signal into a square wave... I am trying to count the number of squarewaves/heartbeats and display them on two 7-segment displays refreshing every 15 seconds...
I can only use a 4029 Up.dwn counter and a BCD driver to 7 segment display...
My issue is that the 4029 is going to need to refresh every 15 seconds however ! the output needs to be in bpm (Beats per minute) which means it is off by a factor of 4... How can i multiply the output by 4 or is there a clever way i can do this with the timer that resets the 4029 every 15 seconds? PLEASE HELP. I've looked everywhere. even minute insight may prove valuable. thanks in advance.
 
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Hey, Tenacity.
I can't help you at all; I know nothing about electronics. It does strike me, however, that this might get better participation if you have it moved to Electrical Engineering or maybe even the Computer section.
 
How about a counter that updates every second. Put your heartbeat pulse into a 64 bit shift register that shifts every 0.234 second, and you have a up-down counter that keeps track of all the "1" bits in the SR during a continously updating 15 second interval.
 
huh , interesting thought, but I am not sure i can use a shift register... these are the components i can use...
4011 CMOS NAND (2 input)
4029 CMOS UP/DN COUNTER
4043 RS TYPE FF
4093 SCHMITT TR NAND
4511 LED DRIVER
7 SEGMENT DISPLAY
7400 NAND (2 Input)
7402 NOR (2 Input)
7404 INVERTER
7408 AND
7410 NAND (3 Input)
7420 NAND (4 Input)
7430 NAND (8 Input)
7432 OR (2 Input)
7437 NAND (High current)
7440 NAND (High current)
7442 BCD TO 1 OF 10 DECODER
7474 D TYPE FF
7476 JK TYPE FF
7486 EXOR
7490 DECADE COUNTER
74151 DATA SELECTOR
74153 DATA SELECTOR
324 OP-AMP
339 OP-AMP
356 OP-AMP
741 OP-AMP
386 AUDIO POWER AMPLIFIER
555 TIMER
RED LEDs
SK3024 PNP BJT
ZENER DIODE (5V)
IN914 DIODE

Im using the 4029 CMOS UP/DN COUNTER with the LED driver that outputs to the LED. any ideas using these components?
 

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