pulseSensor.sawStartOfBeat is always false

[Tvde1]

Here is my (short) sketch:

#define USE_ARDUINO_INTERRUPTS false
#include <PulseSensorPlayground.h>

PulseSensorPlayground pulseSensor;

void setup() {
    Serial.begin(115200);

    pulseSensor.analogInput(A0);

    pulseSensor.setSerial(Serial);
    pulseSensor.setOutputTypeSERIAL_PLOTTER);
    pulseSensor.setThreshold(550);

    samplesUntilReport = SAMPLES_PER_SERIAL_SAMPLE;

    if (!pulseSensor.begin()) {
        Serial.println("Cannot begin.");
    }
}

void loop() {
    if (pulseSensor.sawStartOfBeat()) {
        pulseSensor.outputBeat();
    }
}

This will never output anything while previously using pulseSensor.outputSample(); would output valid bpm and a nice heartbeat to the graph.

I tested this with the serial monitor on an ESP8266.

[biomurph]

Try running the BPM_Alternative example sketch from the Playground. I'm pretty sure you need to run the sawNewSample() function in order to get the sawStartOfBeat() to work right.

[Tvde1]

I just put it in there in the loop?

[biomurph]

First, use the example BPM_Alternative code, and then work from that if you need to make any adjustments.