const int buzzerPin = A5; // Pin that the buzzer is connected to

char pyInput;
unsigned long previousMillis = 0;
unsigned long currentMillis = 0;

void setup() {

  Serial.begin(9600);
  pinMode(buzzerPin, OUTPUT); // Set Buzzer Pin A5 to OUTPUT.

    Serial.println("type 's' or 'p' below and hit enter\n");


}

void loop() {

  if (Serial.available() > 0) {

    pyInput = Serial.read();

    switch (pyInput) {
      case 'p':
        buzzerBeep(2, 300); // Beep once for 300ms 
        break;
        
      case 's':
        buzzerBeep(8, 80); // Beep 4 times for 80ms each time 
        break;
    }
  }
}

// Function for buzzer's sequence/ beeps
void buzzerBeep(int rep, long buzzer_interval) {

  static int buzzer_toggleCount = 0;
  static int buzzer_currentState = LOW;

  if (buzzer_toggleCount < rep) {
    currentMillis = millis();

    if (currentMillis - previousMillis >= buzzer_interval) {
      if (buzzer_currentState == LOW) {
        digitalWrite(buzzerPin, HIGH);
        buzzer_currentState = HIGH;
      } else {
        digitalWrite(buzzerPin, LOW);
        buzzer_currentState = LOW;
      }
      previousMillis = currentMillis;
      buzzer_toggleCount++;
    }
  }
}