/*  PulseSensor Starter Project and Signal Tester
 *  The Best Way to Get Started  With, or See the Raw Signal of, your PulseSensor.com™ & Arduino.
 *
 *  Here is a link to the tutorial
 *  https://pulsesensor.com/pages/code-and-guide
 *
 *  WATCH ME (Tutorial Video):
 *  https://www.youtube.com/watch?v=RbB8NSRa5X4
 *
 *
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1) This shows a live human Heartbeat Pulse.
2) Live visualization in Arduino's Cool "Serial Plotter".
3) Blink an LED on each Heartbeat.
4) This is the direct Pulse Sensor's Signal.
5) A great first-step in troubleshooting your circuit and connections.
6) "Human-readable" code that is newbie friendly."

*/


//  Variables
int PulseSensorPurplePin = 0;  // Pulse Sensor PURPLE WIRE connected to ANALOG PIN 0
int LED = LED_BUILTIN;         //  The on-board Arduion LED


int Signal;           // holds the incoming raw data. Signal value can range from 0-1024
int Threshold = 580;  // Determine which Signal to "count as a beat", and which to ingore.


// The SetUp Function:
void setup() {
  pinMode(LED, OUTPUT);  // pin that will blink to your heartbeat!
  Serial.begin(57600);  // Set's up Serial Communication at certain speed.
}

// The Main Loop Function
void loop() {

  Signal = analogRead(PulseSensorPurplePin);  // Read the PulseSensor's value.
  // Assign this value to the "Signal" variable.

// Send "reading " followed by the Signal value to Serial Plotter.
  Serial.println("Signal " + String(Signal));  

  if (Signal > Threshold) {  // If the signal is above "550", then "turn-on" Arduino's on-Board LED.
    digitalWrite(LED, HIGH);
  } else {
    digitalWrite(LED, LOW);  //  Else, the sigal must be below "550", so "turn-off" this LED.
  }

  delay(20);
}