// Flashing Light Prize (4) Arduino Horror
// vgmlr
int led = 13;
int relay = 2;
int pulse = A0;
int val;
int tot;
int nxt;
int high;
int potpin = A5;
int potval;
void setup() {
  Serial.begin(115200);
  pinMode(relay, OUTPUT);
  pinMode(led, OUTPUT);
  // Get Comfortable
  for (int i = 0; i <= 5; i++) {
    digitalWrite(led, HIGH);
    delay(500);
    digitalWrite(led, LOW);
    delay(500);
  }
}
void loop() {
  // Reset Value
  tot = 0;
  // Smoothing
  for (int i = 0; i <= 25; i++) {
    val = analogRead(pulse);
    tot = val + tot;
    delay(2);
  }
  nxt = tot / 25;
  Serial.println(nxt);
  // To Solve Pulse Reading Inconsistency
  // Adjust the Relay Trigger Peak Value
  potval = analogRead(potpin);
  high = map(potval, 0, 1023, 520, 570);
  if (nxt > high) {
    digitalWrite(relay, HIGH);
    digitalWrite(led, HIGH);
  } else {
    digitalWrite(relay, LOW);
    digitalWrite(led, LOW);
  }
  delay(5);
}