Need help integrating pulsesensor heart beat sensor.

RE: Need help integrating pulsesensor heart beat sensor.

sid — Tue, 13 Sep 2016 13:10:05 GMT

Thank you Stefan, I will make a library and upload it here so that others can benefit as well.

RE: Need help integrating pulsesensor heart beat sensor.

Stefan Birnir Sverrisson — Mon, 05 Sep 2016 08:20:51 GMT

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.

RE: Need help integrating pulsesensor heart beat sensor.

sid — Fri, 02 Sep 2016 18:53:28 GMT

Yes Stefan that is correct, I am trying to make an application for nrf51822, the sensor should integrate with ADC of nrf51822 also I am using SDK 11.

RE: Need help integrating pulsesensor heart beat sensor.

Stefan Birnir Sverrisson — Fri, 02 Sep 2016 16:15:00 GMT

So are you trying to make application for nRF51, nRF52, or something else? If so, do you wish to make your application for nRF5 SDK 11?