/********************
Toaster Project
Rev 3
Jian Song

Functions:
1. Drehschalter
2. Auslösemagnet
3. Temperatursensor
4. Heizwendel
5. Stoptaste
6. LCD
7. Kontrollanzeige
*********************/

void Drehschalter() {                                                           //function for calibration of the heating time
  
      int Grades;                                                               //define the degrees of browning
      unsigned long tmax = 60000;                                               //define the max. heating time
      Grades = analogRead(0);                                                   //read the data from pin A0 of analog input
      if (Grades >= 0 && Grades <= 205) {                                       //input range for A0 is from 0 to 1024(because of 10 bit ADC), define potentiometer as 5 steps
        tmax = 10000;
            }
      if (Grades > 205 && Grades <= 410) {
        tmax = 20000;
            }
      if (Grades > 410 && Grades <= 615) {
        tmax = 30000;
            }
      if (Grades > 615 && Grades <= 820) {
        tmax = 40000;
            }
      if (Grades > 820 && Grades <= 1024) {
        tmax = 50000;
            }                                        

}

void Ausloesemagnet() {                                                           //function for magnet trigger
  
      int Magnet = 11;                                                            //define the magnet  
      unsigned long t = 0;                                                        //define the runtime
      pinMode(Magnet, OUTPUT);                                                    //set pin 11 as digital output
      while (t < tmax) {                                                          //run the loop if the runtime is less then tmax
        t = millis();                                                             //returns the number of milliseconds since the Arduino board began running the current program
        digitalWrite(Magnet, HIGH);                                               //turn on the magnet
        }    
        digitalWrite(Magnet, LOW);                                                //turn off the magnet, if the loop is broken

}

void Temperatursensor() {                                                         //function for reading temperature in celsius
        
      #include <OneWire.h>                                                        //use onewire library
      #include <DallasTemperature.h>                                              //use dallastemperature library           
               
      int tempsensor = 6;                                                         //define temperature sensor
      double temperature;                                                         //define the temperature
      double Tmax = 50;                                                           //define the max. temperature
      OneWire onewirepin(tempsensor);                                             //setup a onewire instance to communicate with any onewire devices
      DallasTemperature sensors(&onewirepin);                                     //pass our oneWire reference to dallas temperature
      sensors.begin();                                                            //start the library up
      sensors.requestTemperatures();                                              //send the command to get temperatures
      temperature=sensors.getTempCByIndex(0);                                     //get the temperature from the first sensor only
      if (temperature > Tmax) {                                                   //compare the current temperature and max. temperature. if higher than max. , set t as tmax, then that while loop condition in function of ausloesemagnet is not true anymore, so the while loop will be broken until reset.
        t = tmax;
      }

}

void Heizwendel() {                                                               //function for controlling the heater
       
      #include <PWM.h>                                                            //use PWM library
      
      #define PIN_OUTPUT 3                                                        //define pin 3 as output of PWM
      int D;                                                                      //set the dutycycle for PWM(8 bit timer can provide a range from 0 to 255 steps for PWM)
      int32_t frequency = 10;                                                     //set the frequency of PWM in hertz
      InitTimersSafe();                                                           //initialize all timers except for 0, to save time keeping functions(for UNO timer0 and timer2 are 8 bit, timer1 is 16 bit; pins 5 and 6: controlled by timer0; pins 9 and 10: controlled by timer1; pins 11 and 3: controlled by timer2)
      bool success = SetPinFrequencySafe(PIN_OUTPUT,frequency);                   //sets the frequency for pin 3
      D = map(analogRead(1), 0, 1023, 0, 255);                                    //re-maps the range of analog input A1 from 0 - 1023 to 0 - 255
      pwmWrite(PIN_OUTPUT, D);                                                    //use this functions instead of analogWrite on pin 3
      
}

void Stoptaste() {                                                                //function for the stop button

      int S;                                                                      //define the push button as stop button
      S = digitalRead(2);                                                         //read HIGH or LOW digital signal from pin 2
      if (S == HIGH) {                                                            //if the button is pressed, set t as tmax, then that while loop condition in function of ausloesemagnet is not true anymore, so the while loop will be broken until reset.
        t = tmax;
      }
      
}

void LCD() {

      #include <LiquidCrystal.h>                                                 //use LCD library

      LiquidCrystal lcd(13, 12, 10, 9, 8, 7);                                    //initialize the library with the numbers of the interface pins
      lcd.begin(16, 2);                                                           //set up the LCD's number of columns and rows
      lcd.setCursor(0, 0);                                                        //set the cursor to column 0, line 0(line 0 is the first row, since counting begins with 0)
      lcd.print("T=");                                                            //print "Temperature = "
      lcd.print(temperature);                                                     //print temperature in celsius
      lcd.print("`C ");
      lcd.print("t=");                                                            //print "Time = "
      lcd.print(millis()/1000);                                                   //print current runtime in seconds
      lcd.print("s");
      lcd.setCursor(0, 1);                                                        //set the cursor to column 0, line 1
      lcd.print("D=");                                                            //print "Dutycycle = "
      lcd.print((D*100)/255);                                                     //print current dutycycle in percent
      lcd.print("% ");
      lcd.print("tmax=");                                                         //print "max. runtime = "
      lcd.print(tmax/1000);                                                       //print preset of max. runtime in seconds
      lcd.print("s   ");
      
}
void Kontrollanzeige() {                                                          //shows the status, if PWM is working

     #define LED 5
     analogWrite(LED, D);                                                         //put a LED and resistor between pin 5 and GND
}