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PulseSensor_BPM.ino
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PulseSensor_BPM.ino
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/*
Code to detect heartbeat pulses from the PulseSensor
Check out the PulseSensor Playground Tools for explaination
of all user functions and directives.
https://github.com/WorldFamousElectronics/PulseSensorPlayground/blob/master/resources/PulseSensor%20Playground%20Tools.md
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.
*/
/*
Include the PulseSensor Playground library to get all the good stuff!
The PulseSensor Playground library will decide whether to use
a hardware timer to get accurate sample readings by checking
what target hardware is being used and adjust accordingly.
You may see a "warning" come up in red during compilation
if a hardware timer is not being used.
*/
#include <PulseSensorPlayground.h>
/*
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 = LED_BUILTIN;
const int PULSE_FADE = 5;
const int THRESHOLD = 550; // Adjust this number to avoid noise when idle
/*
All the PulseSensor Playground functions.
*/
PulseSensorPlayground pulseSensor;
void setup() {
/*
Use 115200 baud because that's what the Processing Sketch expects to read,
and because that speed provides about 11 bytes per millisecond.
If we used a slower baud rate, we'd likely write bytes faster than
they can be transmitted, which would mess up the timing
of readSensor() calls, which would make the pulse measurement
not work properly.
*/
Serial.begin(115200);
// 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); Serial.println('!');
digitalWrite(PULSE_BLINK, HIGH);
delay(50);
}
}
}
void loop() {
/*
See if a sample is ready from the PulseSensor.
If USE_HARDWARE_TIMER is true, the PulseSensor Playground
will automatically read and process samples from
the PulseSensor.
If USE_HARDWARE_TIMER is false, the call to sawNewSample()
will check to see how much time has passed, then read
and process a sample (analog voltage) from the PulseSensor.
Call this function often to maintain 500Hz sample rate,
that is every 2 milliseconds. Best not to have any delay()
functions in the loop when using a software timer.
Check the compatibility of your hardware at this link
<url>
and delete the unused code portions in your saved copy, if you like.
*/
if(pulseSensor.UsingHardwareTimer){
/*
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();
} else {
/*
When using a software timer, we have to check to see if it is time
to acquire another sample. A call to sawNewSample will do that.
*/
if (pulseSensor.sawNewSample()) {
/*
Every so often, send the latest Sample.
We don't print every sample, because our baud rate
won't support that much I/O.
*/
if (--pulseSensor.samplesUntilReport == (byte) 0) {
pulseSensor.samplesUntilReport = SAMPLES_PER_SERIAL_SAMPLE;
pulseSensor.outputSample();
}
}
}
/*
If a beat has happened since we last checked,
write the per-beat information to Serial.
*/
if (pulseSensor.sawStartOfBeat()) {
pulseSensor.outputBeat();
}
}