Compatibility issue Nano BLE ABX00034

[myazenko]

Hi, I'd like to know which arduino boards are compatible with the pulse sensor, aside from the arduino UNO. I can't seem to find that information anywhere, all I know is that it does not work with the Nano BLE ABX00034, and I don't understand why, since it uses interrupts. Thanks

[biomurph]

@myazenko We are working on adding support for th nRF52 based boards. Currently our github repository was just updated with an example https://github.com/WorldFamousElectronics/PulseSensorPlayground Please download the zip from the repo and use that library in Arduino>libraries folder.

The example PulseSensor_nRF52.ino uses a dependent library called nRF52_TimerInterrupt. That library will only work on Adafruit and Seeed platforms.

You are using Nano 33 BLE. That is an Mbed platform. For that one, use the PulseSensor_BPM_Alternative.ino example.

[biomurph]

@myazenko I just found out that khohi-prog put together an interrupt library for MBED https://github.com/khoih-prog/NRF52_MBED_TimerInterrupt

I was able to modify the example sketch in our library to at least get it to compile for the Nano 33 BLE. I don't have a Nano 33 on hand to fully test it. Please download the library directly from the repository using the green 'download zip' button selection. Put that in your Arduino > libraries folder and restart. Then open the PulseSensor_nRF52 example sketch. There are instructions there in the comments. Please read through to set up for MBED correctly.

[myazenko]

Hi, I just tried the new example sketch, but it does not compile on my end. I get these errors :

In file included from D:\Documents\Arduino\libraries\PulseSensorPlayground\src/PulseSensorPlayground.h:469:0, from C:\Users\Mya\AppData\Local\Temp.arduinoIDE-unsaved2023113-1544-1raddl0.ob13\PulseSensor_nRF52\PulseSensor_nRF52.ino:65: D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h: In function 'boolean PulseSensorPlaygroundSetupInterrupt()': D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h:242:9: error: 'nRF52_Timer' was not declared in this scope if (nRF52_Timer.attachInterruptInterval(TIMER3_INTERVAL_US, Timer3_ISR)){ ^~~ D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h:242:9: note: suggested alternative: 'nRF52Timers' if (nRF52_Timer.attachInterruptInterval(TIMER3_INTERVAL_US, Timer3_ISR)){ ^~~ nRF52Timers D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h:242:65: error: 'Timer3_ISR' was not declared in this scope if (nRF52_Timer.attachInterruptInterval(TIMER3_INTERVAL_US, Timer3_ISR)){ ^~~~~~ D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h:242:65: note: suggested alternative: 'TimerType' if (nRF52_Timer.attachInterruptInterval(TIMER3_INTERVAL_US, Timer3_ISR)){ ^~~~~~ TimerType D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h: In function 'boolean PulseSensorPlaygroundDisableInterrupt()': D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h:314:5: error: 'nRF52_Timer' was not declared in this scope nRF52_Timer.stopTimer(); ^~~ D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h:314:5: note: suggested alternative: 'nRF52Timers' nRF52_Timer.stopTimer(); ^~~ nRF52Timers In file included from D:\Documents\Arduino\libraries\PulseSensorPlayground\src/PulseSensorPlayground.h:469:0, from C:\Users\Mya\AppData\Local\Temp.arduinoIDE-unsaved2023113-1544-1raddl0.ob13\PulseSensor_nRF52\PulseSensor_nRF52.ino:65: D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h: In function 'boolean PulseSensorPlaygroundEnableInterrupt()': D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h:374:5: error: 'nRF52_Timer' was not declared in this scope nRF52_Timer.restartTimer(); ^~~ D:\Documents\Arduino\libraries\PulseSensorPlayground\src/utility/Interrupts.h:374:5: note: suggested alternative: 'nRF52Timers' nRF52_Timer.restartTimer(); ^~~ nRF52Timers

exit status 1

Compilation error: exit status 1

[myazenko]

Just to be sure I did not do anything wrong, here's a copy of the code :

/* Code to detect pulses from the PulseSensor, using an interrupt service routine.

This example is made to target boards in the nRF52 family. Install the dependent library. Go to Sketch > Include Library > Mange Libraries. When the Library Manager loads, search for NRF52_TimerInterrupt, if you are using an Adafruit or Seeed nRF52 platform. If you are using MBED, like the Nano 33 BLE, search for NRF52_MBED_TimerInterrupt.

Install the latest version.

This is a prototype version of PulseSensor_nRF52.ino use at your own risk.

Copyright World Famous Electronics LLC - see LICENSE Contributors: Joel Murphy, https://pulsesensor.com Yury Gitman, https://pulsesensor.com Bradford Needham, @bneedhamia, https://bluepapertech.com

Licensed under the MIT License, a copy of which should have been included with this software.

This software is not intended for medical use. */

/ If you are using an Adafruit or Seeed nRF52 platform, uncomment the next line to use the NRF52TimerInterrupt library / //#include "NRF52TimerInterrupt.h"

/ If you are using an MBED nRF52 platform, like Nano 33 BLE, uncomment the next lines to use the NRF52_MBED_TimerInterrupt library /

include

include

include

include

define TIMER3_INTERVAL_US 2000 // critical fine tuning here!

/ If you are using an Adafruit or Seeed nRF52 platform, uncomment the next line to use the NRF52TimerInterrupt library / //NRF52Timer nRF52_Timer(NRF_TIMER_3);

/ If you are using an MBED nRF52 platform, like Nano 33 BLE, uncomment the next lines to use the NRF52_MBED_TimerInterrupt library / NRF52_MBED_Timer PulseTimer(NRF_TIMER_3);

/* Every Sketch that uses the PulseSensor Playground must define USE_ARDUINO_INTERRUPTS before including PulseSensorPlayground.h. Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use interrupts to automatically read and process PulseSensor data.

See ProcessEverySample.ino for an example of not using interrupts. */

define USE_ARDUINO_INTERRUPTS true

include

void Timer3_ISR(){ PulseSensorPlayground::OurThis->onSampleTime(); } /* The format of our output.

Set this to PROCESSING_VISUALIZER if you're going to run the Processing Visualizer Sketch. See https://github.com/WorldFamousElectronics/PulseSensor_Amped_Processing_Visualizer

Set this to SERIAL_PLOTTER if you're going to run the Arduino IDE's Serial Plotter. */ const int OUTPUT_TYPE = SERIAL_PLOTTER;

/ Pinout: PULSE_INPUT = Analog Input. Connected to the pulse sensor purple (signal) wire. PULSE_BLINK = digital Output. Connected to an LED (and 1K series resistor) that will flash on each detected pulse. PULSE_FADE = digital Output. PWM pin onnected to an LED (and 1K series resistor) that will smoothly fade with each pulse. NOTE: PULSE_FADE must be a pin that supports PWM. Do not use pin 9 or 10, because those pins' PWM interferes with the sample timer. THRESHOLD should be set higher than the PulseSensor signal idles at when there is nothing touching it. The expected idle value should be 512, which is 1/2 of the ADC range. To check the idle value open a serial monitor and make note of the PulseSensor signal values with nothing touching the sensor. THRESHOLD should be a value higher than the range of idle noise by 25 to 50 or so. When the library is finding heartbeats, the value is adjusted based on the pulse signal waveform. THRESHOLD sets the default when there is no pulse present. Adjust as neccesary. / const int PULSE_INPUT = A0; const int PULSE_BLINK = 13; const int PULSE_FADE = 12; const int THRESHOLD = 550; // Adjust this number to avoid noise when idle

/ All the PulseSensor Playground functions. / PulseSensorPlayground pulseSensor;

void setup() { / 115200 provides about 11 bytes per millisecond. If we used a slower baud rate, we'd likely write bytes faster than they can be transmitted,. / Serial.begin(115200); while (!Serial && millis() < 5000);

// Configure the PulseSensor manager.

pulseSensor.analogInput(PULSE_INPUT); pulseSensor.blinkOnPulse(PULSE_BLINK); pulseSensor.fadeOnPulse(PULSE_FADE);

pulseSensor.setSerial(Serial); pulseSensor.setOutputType(OUTPUT_TYPE); pulseSensor.setThreshold(THRESHOLD);

// Now that everything is ready, start reading the PulseSensor signal. if (!pulseSensor.begin()) { /* PulseSensor initialization failed, likely because our particular Arduino platform interrupts aren't supported yet.

   If your Sketch hangs here, try PulseSensor_BPM_Alternative.ino,
   which doesn't use interrupts.
*/
for(;;) {
  // Flash the led to show things didn't work.
  digitalWrite(PULSE_BLINK, LOW);
  delay(50);
  digitalWrite(PULSE_BLINK, HIGH);
  delay(50);
}

} if (PulseTimer.attachInterruptInterval(TIMER3_INTERVAL_US, Timer3_ISR)){ Serial.println(F("Starting Timer 3")); } else { Serial.println(F("Timer 3 Startup failed!")); } }

void loop() { / Wait a bit. We don't output every sample, because our baud rate won't support that much I/O. / delay(20);

// write the latest sample to Serial. pulseSensor.outputSample();

/ If a beat has happened since we last checked, write the per-beat information to Serial. / if (pulseSensor.sawStartOfBeat()) { pulseSensor.outputBeat(); } }

[biomurph]

@myazenko please try again with the library fix that I just merged. I confirmed that it compiles OK for Nano 33 BLE

[biomurph]

PulseSenor Playground Library supports nRF52 based boards