#include <avr/power.h>

int ledPin = 8;
int buttonPin = 7;

int ditMs = 100;
int dahMs = 3 * ditMs;
int delayBetweenCharacters = 2 * ditMs; //theoretically, this is 3 dit, but 1 dit is already included in the dit and dah functions
int delayBetweenSos = 6 * ditMs;  //theoretically, this is 7 dit, but 1 dit is already included in the dit and dah functions

int buzzerPin = 11 ; // Deklaration des Buzzer-Ausgangspin
long buzzerLast = 0;
long buzzerNow = 0;
int buzzerFrequency = 220;
int buzzerIntervalMillis = 1000/buzzerFrequency/2;
int buzzerIntervalMicros = 1000000/buzzerFrequency/2;
boolean buzzerState = 0;

void setup() {
  clock_prescale_set(0);
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  digitalWrite(buttonPin, HIGH);  //Internal pullup on Button Pin
  pinMode (buzzerPin, OUTPUT) ;// Initialisierung als Ausgangspin
  //beep(buzzerPin, 1000);
  //delay(1000);
  //beep(buzzerPin, 500);
  //delay(1000);
  //beep(buzzerPin, 250);
  //delay(1000);
}

void loop() {
  if(digitalRead(buttonPin) != LOW){
    /*digitalWrite(ledPin, HIGH);   
    delay(1000);                     
    digitalWrite(ledPin, LOW);    
    delay(1000);*/
    //sosBlink(ledPin);
    sosBeep(buzzerPin);
    delay(delayBetweenSos);
  }
}

void dit(int blinkPin){
  digitalWrite(blinkPin, HIGH);
  delay(ditMs);
  digitalWrite(blinkPin, LOW);
  delay(ditMs);
}

void dah(int blinkPin){
  digitalWrite(blinkPin, HIGH);
  delay(dahMs);
  digitalWrite(blinkPin, LOW);
  delay(ditMs);
}

void sosBlink(int blinkPin){
  dit(blinkPin);
  dit(blinkPin);
  dit(blinkPin);
  delay(delayBetweenCharacters);
  dah(blinkPin);
  dah(blinkPin);
  dah(blinkPin);
  delay(delayBetweenCharacters);
  dit(blinkPin);
  dit(blinkPin);
  dit(blinkPin);
}

void ditBeep(int buzzerPin){
  beep(buzzerPin, ditMs);
  delay(ditMs);
}

void dahBeep(int buzzerPin){
  beep(buzzerPin, dahMs);
  delay(ditMs);
}

void sosBeep(int buzzerPin){
  ditBeep(buzzerPin);
  ditBeep(buzzerPin);
  ditBeep(buzzerPin);
  delay(delayBetweenCharacters);
  dahBeep(buzzerPin);
  dahBeep(buzzerPin);
  dahBeep(buzzerPin);
  delay(delayBetweenCharacters);
  ditBeep(buzzerPin);
  ditBeep(buzzerPin);
  ditBeep(buzzerPin);
}

void beep(int buzzerPin, int duration){
    long start = millis();
    while((millis()-start) < duration){
      buzzerNow = micros();
      if((buzzerNow - buzzerLast) >= buzzerIntervalMicros){
        buzzerLast = buzzerNow;
        buzzerState = !buzzerState;
        digitalWrite(buzzerPin, buzzerState);
      }
    }
}