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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.
Here is my (short) sketch:
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.
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