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  1. Mar 25, 2009 #1
    what can be the frequency for the clock signal that is to be counted? I read on another website that it is a minimum of 2MHz!!! to run optimally...that is. Well I am trying to count heartrate from a microphone that is amplified and filtered to look likea square wave or pulse train....Not sure yet. and it neeeds to display the heart rate in beats per minute and be refreshed every 15 seconds.... Hmmm... I understand how i can use the 4011 which is the driver that takes the BCd to 7 segment, yet am unsure how to count the bpm in teh backround and send it to the driver every 15 seconds... Please Shed some light thanks. bye
  2. jcsd
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