#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

#define coil_1 3
#define coil_2 9
#define coil_3 10
#define coil_4 11
#define button_1 13
#define input_1 14
#define input_2 15
#define input_3 16
#define input_4 17
#define pot_1 A6
#define pot_2 A7

int dutyCycle; // 8-bit value
int Delay; // in milliseconds
byte watchdog_1;
byte watchdog_2;
byte watchdog_3;
byte watchdog_4;

// Timer_2 variables
int trigger;
int cycle;
const long duration_2 = 300000; // milliseconds
long offset_2;
unsigned long currentMillis;

// Button variables
int page;
byte watchdog_5;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.clear();

  pinMode(coil_1, OUTPUT);
  pinMode(coil_2, OUTPUT);
  pinMode(coil_3, OUTPUT);
  pinMode(coil_4, OUTPUT);
  pinMode(input_1, INPUT_PULLUP);
  pinMode(input_2, INPUT_PULLUP);
  pinMode(input_3, INPUT_PULLUP);
  pinMode(input_4, INPUT_PULLUP);
  pinMode(button_1, INPUT_PULLUP);

  watchdog_1 = false;
  watchdog_2 = false;
  watchdog_3 = false;
  watchdog_4 = false;

  analogWrite(coil_1, 0);
  analogWrite(coil_2, 0);
  analogWrite(coil_3, 0);
  analogWrite(coil_4, 0);

  lcd.noBacklight();
  trigger = 0;
  cycle = 0;
  currentMillis = millis(); 
  page = 1;
  watchdog_5 = false;

}

void loop() {
  Display();
  Coil();
  Button();
  timer_2();

  int a = analogRead(pot_1);
  int b = analogRead(pot_2);

  dutyCycle = map(a, 0, 1023, 0, 255);
  Delay = map(b, 0, 1023, 0, 1000);


}

void Button() {
  if(page == 1) {
    if(digitalRead(button_1) == LOW){
      watchdog_5 = true;
    }
    else if((digitalRead(button_1) == HIGH) && (watchdog_5 == true)){
      watchdog_5 = false;
      page = 2;
      trigger = 1;
      lcd.clear();
    }
  }
  if(page == 2) {
    if(digitalRead(button_1) == LOW){
      watchdog_5 = true;
    }
    else if((digitalRead(button_1) == HIGH) && (watchdog_5 == true)){
      watchdog_5 = false;
      page = 3;
      trigger = 1;
      lcd.clear();
    }
  }
  if(page == 3) {
    if(digitalRead(button_1) == LOW){
      watchdog_5 = true;
    }
    else if((digitalRead(button_1) == HIGH) && (watchdog_5 == true)){
      watchdog_5 = false;
      page = 1;
      trigger = 1;
      lcd.clear();
    }
  }

}

void timer_2() {
  currentMillis = millis();

  if(trigger == 1) {
    offset_2 = currentMillis;
    trigger = 0;
  }
  if(currentMillis < (offset_2 + duration_2)) {
    cycle = 1;
  }
  if(currentMillis > (offset_2 + duration_2)) {
    cycle = 0;
  }
}

void Coil() {
  if(digitalRead(input_1) == HIGH) {
    analogWrite(coil_1, 0);
    watchdog_1 = false;
  }
  else if(digitalRead(input_1) == LOW) {
    if(watchdog_1 == false) {
      analogWrite(coil_1, 255);
      delay(Delay);
      for(int i = 255; i > dutyCycle; i--) {
        analogWrite(coil_1, i);
        delay(10);
      }
      watchdog_1 = true;
    }
    else if(watchdog_1 == true) {
      analogWrite(coil_1, dutyCycle);
    }
  }

  if(digitalRead(input_2) == HIGH) {
    analogWrite(coil_2, 0);
    watchdog_2 = false;
  }
  else if(digitalRead(input_2) == LOW) {
    if(watchdog_2 == false) {
      analogWrite(coil_2, 255);
      delay(Delay);
      for(int i = 255; i > dutyCycle; i--) {
        analogWrite(coil_2, i);
        delay(10);
      }
      watchdog_2 = true;
    }
    else if(watchdog_2 == true) {
      analogWrite(coil_2, dutyCycle);
    }
  }

  if(digitalRead(input_3) == HIGH) {
    analogWrite(coil_3, 0);
    watchdog_3 = false;
  }
  else if(digitalRead(input_3) == LOW) {
    if(watchdog_3 == false) {
      analogWrite(coil_3, 255);
      delay(Delay);
      for(int i = 255; i > dutyCycle; i--) {
        analogWrite(coil_3, i);
        delay(10);
      }
      watchdog_3 = true;
    }
    else if(watchdog_3 == true) {
      analogWrite(coil_3, dutyCycle);
    }
  }

  if(digitalRead(input_4) == HIGH) {
    analogWrite(coil_4, 0);
    watchdog_4 = false;
  }
  else if(digitalRead(input_4) == LOW) {
    if(watchdog_4 == false) {
      analogWrite(coil_4, 255);
      delay(Delay);
      for(int i = 255; i > dutyCycle; i--) {
        analogWrite(coil_4, i);
        delay(10);
      }
      watchdog_4 = true;
    }
    else if(watchdog_4 == true) {
      analogWrite(coil_4, dutyCycle);
    }
  }
}

void Display() {
  if(cycle == 1) {
    lcd.backlight();
  }
  else if(cycle == 0) {
    lcd.noBacklight();
  }

  if(page == 1) {
    lcd.setCursor(0,0);
    lcd.print("Coil 1: ");
    if(watchdog_1 == false) {
      lcd.print("OFF");
    }
    else if(watchdog_1 == true) {
      lcd.print("ON ");
    }

    lcd.setCursor(0,1);
    lcd.print("Coil 2: ");
    if(watchdog_2 == false) {
      lcd.print("OFF");
    }
    else if(watchdog_2 == true) {
      lcd.print("ON ");
    }

    lcd.setCursor(0,2);
    lcd.print("Coil 3: ");
    if(watchdog_3 == false) {
      lcd.print("OFF");
    }
    else if(watchdog_3 == true) {
      lcd.print("ON ");
    }

    lcd.setCursor(0,3);
    lcd.print("Coil 4: ");
    if(watchdog_4 == false) {
      lcd.print("OFF");
    }
    else if(watchdog_4 == true) {
      lcd.print("ON ");
    }
  }
  else if(page == 2 ) {
    lcd.setCursor(0,0);
    lcd.print("Input 1: ");
    if(digitalRead(input_1) == HIGH) {
      lcd.print("INACTIVE");
    }
    else if(digitalRead(input_1) == LOW) {
      lcd.print("ACTIVE  ");
    }

    lcd.setCursor(0,1);
    lcd.print("Input 2: ");
    if(digitalRead(input_2) == HIGH) {
      lcd.print("INACTIVE");
    }
    else if(digitalRead(input_2) == LOW) {
      lcd.print("ACTIVE  ");
    }

    lcd.setCursor(0,2);
    lcd.print("Input 3: ");
    if(digitalRead(input_3) == HIGH) {
      lcd.print("INACTIVE");
    }
    else if(digitalRead(input_3) == LOW) {
      lcd.print("ACTIVE  ");
    }

    lcd.setCursor(0,3);
    lcd.print("Input 4: ");
    if(digitalRead(input_4) == HIGH) {
      lcd.print("INACTIVE");
    }
    else if(digitalRead(input_4) == LOW) {
      lcd.print("ACTIVE  ");
    }

  }
  else if(page == 3 ) {
    lcd.setCursor(0,0);
    lcd.print("Duty Cycle: ");
    lcd.print(dutyCycle);
    lcd.print("  ");

    lcd.setCursor(0,1);
    lcd.print("Delay: ");
    lcd.print(Delay);
    lcd.print("   ");

  }

}