#include <LiquidCrystal_I2C.h>
#include <Wire.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display. ACHTUNG: Adresse kann auch 0x3F sein !!!

// Anschlüsse:
// GND - GND
// VCC - 5V
// SDA - ANALOG Pin 4
// SCL - ANALOG pin 5

const int buzzerPin = 9;
const int buttonPin = 10;
const byte interruptPin = 2;

volatile long pulse = 0;
volatile long pulse_min = 0;
long time_sec = 0;
long time_min = 0;
long time_min_old = 0;
long time_hour = 0;
long Anzeige_second = 0;
long Anzeige_minute = 0;
long Anzeige_hour = 0;
long millis_reset = 0;
int buttonState = 0;


// ===========================
// =======   SETUP   =========
// ===========================

void setup()
   {
    Serial.begin(9600);
    
    //pinMode(interruptPin, INPUT_PULLUP);
    
    pinMode(interruptPin, INPUT);
    attachInterrupt(digitalPinToInterrupt(interruptPin), Puls, FALLING);
    
    pinMode(buzzerPin, OUTPUT);
       
    pinMode(buttonPin, INPUT);
    
    lcd.begin();        // initialize the lcd
    lcd.backlight();
    lcd.setCursor(0,0);
    lcd.print("Geigerzaehler");
    lcd.setCursor(0,1);
    lcd.print("Version 1.0");
    
    delay(3000);
    
    lcd.setCursor(0,0);
    lcd.print("             ");
    lcd.setCursor(0,1);
    lcd.print("            ");
        
   }


// ===========================
// =======    LOOP   =========
// ===========================

void loop()
   {
    time_sec = (millis() - millis_reset) / 1000;
    time_min = ((millis() - millis_reset) / 60000);
    time_hour = ((millis() - millis_reset) / 3600000);
    

    Anzeige_second = time_sec - time_min * 60;
    Anzeige_minute = time_min - time_hour * 60;
    Anzeige_hour = time_hour;
    
    delay(100);
    
    Serial.print(Anzeige_hour);
    Serial.print("   ");
    Serial.print(Anzeige_minute);
    Serial.print("   ");
    Serial.print(Anzeige_second);
    Serial.print("   ");
    Serial.println(pulse);
    
    if (time_min > time_min_old)     // "Minutensprung"
       {
        Serial.println();
        Serial.print(pulse_min);
        Serial.println();
        
        lcd.setCursor(8,1);
        lcd.print(pulse_min);
        lcd.print(" CPM    ");
    
        pulse_min = 0;
       }
    
    
    lcd.setCursor(0,0);
    lcd.print(Anzeige_hour);
    lcd.print(" h ");
    lcd.print(Anzeige_minute);
    lcd.print(" min ");
    lcd.print(Anzeige_second);
    lcd.print(" sec  ");    
    
    lcd.setCursor(0,1);
    lcd.print(pulse);
    
    
    buttonState = digitalRead(buttonPin);

    if (buttonState == HIGH)    // Reset-Knopf gedrückt
       {
        millis_reset = millis();
        
        pulse = 0;
        pulse_min = 0;
                
        lcd.setCursor(0,1);
        lcd.print(pulse);
        lcd.print("       ");
                
        lcd.setCursor(8,1);
        lcd.print("-");
        lcd.print(" CPM    ");
       }
    
    time_min_old = time_min;    // Werteübergabe
   }


// ==============================
// =======   INTERRUPT  =========
// ==============================

void Puls()
   {
    pulse = pulse + 1;
    pulse_min = pulse_min + 1;

    tone(buzzerPin,1000,2);  // Ton an Butter
   }