Hi. I am trying to use my Pulse Sensor with my Boron board. I have been trying to use the PulseSensor_Spark library to do so, however whenever I compile my .ino file it says that SparkIntervalTimer isn’t compatible with the Boron board. How can I add the timer/interrupts for the Boron into SparkInte…

@alyssawrong , the SparkIntervalTimer library is not compatible with Gen3 hardware. The library is ties to the STM32Fxxx hardware timers which are not available on Gen3. Currently, only one hardware timer is free on Gen3 devices. I am waiting for some decisions for the DeviceOS that might free up …

hey @peekay123 do you have any time frames for this?

@peekay123 , is it possible to do a software timer for this instead? or are the hardware timers necessary for this? I’m currently trying to adjust the PulseSensor .cpp and .h files to use the Timer functions from Particle but am getting “multiple definitions for …” … all of my variables that have bee…

@alyssawrong , it may be possible given the 2ms timing interval. However, the existing code disables interrupts which may have adverse effects. However, it is worth trying. Do you have a pulse sensor to test with? It would be a trivial thing to adapt a Software Timer.

@peekay123 , I do have a pulse sensor to test with. I’m just not sure how to go about starting a Software Timer. If I commented out the noInterrupts() and interrupts() functions, would this be a start? And then just figuring out how to use the Particle Timer() functions and where to put them is where…

@alyssawrong , I can create a Web IDE app with the modified code that I can share so you can compile and test it.

@peekay123 , this would be much appreciated!! I am currently attempting to do so as well, but will be looking out for yours in the mean time since I am struggling! Thanks again

@peekay123 , sweet! I just tried it with my pulse sensor and it works! When I first flashed it to my Boron it advised me to add the #include PulseSensor.h at the top of the main file, however when I did this it gave me the same error as I was getting when I was attempting to do the SWT (multiple defi…

Thanks @peekay123 ! I used your project to get the Pulse Sensor working on an Argon. Is there much effective difference between the code you posted and a version with hardware timers?

@rob7 , the timer is used to “pump” a 2ms sampling interval of the sensor output so with the Hardware Timer the sampling is done in an ISR while with the Software Timer, it is done in the timer callback. Since both Gen2 and Gen3 devices support Software Timers, that approach is more universal. Ther…

Boron Pulse Sensor and Spark Interval Timer

Firmware Libraries

peekay123 March 22, 2019, 2:04am 10

@alyssawrong, give this a shot. I left the disable/enable interrupts stuff in for now.

https://go.particle.io/shared_apps/5c94423c5893c4000ab8a158

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Boron Pulse Sensor and Spark Interval Timer

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