Need help integrating pulsesensor heart beat sensor.

Question

Hello developers,
I am trying to use ble_hrm service example with actual heart rate from the module pulsesensor.com ( http://pulsesensor.com/ )
I am able to read raw data using ADC but I am not able to figure out how to get beats per minute data from this.
The module has arduino library, if some one has already made a library for this module or a similar module kindly help me with this. 
 Thank you and my best regards,
Sid

Stefan Birnir Sverrisson · Accepted Answer

Hi Sid 
 Thanks for the additional information. 
 There are some nRF51 ADC examples on Nordic Github for SDK 11 if you didn't notice already. I suspect that you need to sample the pulse sensor voltage with certain constant frequency, using TIMER/RTC+PPI. 
 As an idea on how to calculate heart rate from the ADC signal, you could detect when there is a pulse with monitoring when there is a sudden increase in the ADC value. When there is a pulse, you can create a time-stamp for that pulse. Every time there is a pulse you also calculate the pulse frequency from e.g. the last 5 time-stamps. 
 You can create the time stamp by checking the counter value of TIMER/RTC.

Need help integrating pulsesensor heart beat sensor.

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