Counting of heart beat

[doxology]

Hi all

I've designed a circuit based on PIC16F628 that counts the heart beat of hymen in beat per minute bpm and display on a LCD, I faced a problem of converting the pulses in second to minute to be displayed in term of bpm.

I only know this: Counting the time of two pulses and average the time, thats all !! Can any one give me the details of this way along with formulas please.

Thanx

 

[IanP]

heart rate in beats per minute = 60 / [time between two beats (beat to beat interval) expressed in seconds]

https://www.picotech.com/experiments/calculating_heart_rate/