hai.. what kind of problem you are facing? please give us a brief. What controller u are using? Which compiler u r using? if possible post your code (just the portion where u face the issue) and details of problem
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The sensor which you have mentioned says that for every heart beat, the LED will blink. So in that case you can connect a 8051 mcu and monitor the pulses for a sec/min. I think you can use INT0/1 interrupt to count the pulse.