#include <LiquidCrystal.h>

enum State_enum 
{ 
Normal_condition, 
Emergency_Condition,
};

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; // pin 3 of LCD should be connected to GND
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const int relay1 = 6;  // VCC Pin attached to Digital Pin 13, Glycol Pump
const int relay2 = 7;  // VCC Pin attached to Digital Pin 12, Water Pump
const int relay3 = 8;  // VCC Pin attached to Digital Pin 11, Glycol Intake Solenoid Valve
const int relay4 = 9;  // VCC Pin attached to Digital Pin 10, Water Intake Solenoid Valve
const int relay5 = 10;  // VCC Pin attached to Digital Pin 9, Glycol Output Solenoid Valve
const int relay6 = 23;  // VCC Pin attached to Digital Pin 8, Water Output Solenoid Valve
const int relay7 = 25;  // VCC Pin attached to Digital Pin 7, Electric Motor Agitator
const int relay8 = 27; //VCC Pin attached to Digital Pin 6, Mixed Output Solenoid Valve
const int Last_Valve = 53; // Arduino pin 4 connected to button's pin
const int e_stop = 52; // pushbutton connected to pin 1 of aurdino board
const int emergency_LED = 51;
int lastButtonState = 0; // for estop
int last_Button_State_1 = 1;   // for pushbutton connected to realy 8
int buttonState = 0;  // for estop
int button_State_1 = 0;   // for pushbutton connected to realy 8
const int motor_button = 50; 
int motor_button_state = 0;

boolean isPressed = true;
int Glyclol_max_sensor = 0;
int Glyclol_min_sensor = 1;
int Water_max_sensor = 14;
int Water_min_sensor = 15;
int counter;


void setup() {
  lcd.begin(16, 2);
  // you can now interact with the LCD, e.g.:
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);
  pinMode(relay5, OUTPUT);
  pinMode(relay6, OUTPUT);
  pinMode(relay7, OUTPUT);
  pinMode(Last_Valve, INPUT); // set arduino pin to input mode
  pinMode(relay8, OUTPUT);
  pinMode(e_stop, INPUT); // set arduino pin to input mode
  pinMode(emergency_LED, OUTPUT); // set arduino pin to input mode
  pinMode(Glyclol_max_sensor, OUTPUT);
  pinMode(Glyclol_min_sensor, OUTPUT);
  pinMode(Water_max_sensor, OUTPUT);
  pinMode(Water_min_sensor, OUTPUT);
  Serial.begin(115200);
}


void loop()
{
  power_on();
  buttonState = digitalRead(e_stop); // read new state of estop pushbutton
  
  if (buttonState == LOW) 
  {   
  digitalWrite(emergency_LED, LOW);
  Serial.println("emergency stop button is not pressed"); 
  Serial.println("\n"); 
switch (counter)
 {
  case 0: { startup();
            counter = 1;
            delay(100);
            break;}
  case 1: { Intake_Valve();
            counter = 2;
            delay(100);
            break;}
  case 2: {  Output_Valve();
              counter = 3;
              delay(100);
            break;}
  case 3: {  Electric_Motor();
            counter = 4;
             delay(100);
            break;}
  case 4: { Last_Output_Valve();
            counter = 0;
            delay(100);
   
            break;}
    
  }

 /* startup();
  delay(100);
  Intake_Valve();
  delay(100);
  Output_Valve();
  delay(100);
  Electric_Motor();
  delay(100);
  Last_Output_Valve();
  delay(100);
   exit (0);*/
}

  if(buttonState == HIGH)
{
  lcd.clear();
  lcd.print("Emergency");
  lcd.setCursor(0, 1);
  lcd.print("Button Pressed");
  counter = 0;
  digitalWrite(relay1, LOW); 
  digitalWrite(relay2, LOW); 
  digitalWrite(relay3, LOW); 
  digitalWrite(relay4, LOW); 
  digitalWrite(relay5, LOW); 
  digitalWrite(relay6, LOW); 
  digitalWrite(relay7, LOW); 
  digitalWrite(relay8, LOW); 
  //buttonState = LOW;
  button_State_1 = LOW;
  delay(100);
  //exit (0);
} 

}

void power_on()
{
  digitalWrite(relay1, LOW); 
  digitalWrite(relay2, LOW); 
  digitalWrite(relay3, LOW); 
  digitalWrite(relay4, LOW); 
  digitalWrite(relay5, LOW); 
  digitalWrite(relay6, LOW); 
  digitalWrite(relay7, LOW); 
  digitalWrite(relay8, LOW); 
  buttonState = LOW;
  button_State_1 = LOW;
}

void startup()
{
  digitalWrite(emergency_LED, LOW);
  lcd.clear();
  lcd.print("Starting UP");
  delay(1000);
  lcd.clear();
  delay(100);

  digitalWrite(relay1, HIGH); // Turn the relay1/ motor1 ON
  digitalWrite(relay2, HIGH); // Turn the relay2/ motor1 ON
 
  lcd.print("Glycol Pump ");
  lcd.setCursor(0, 1); // display the second word in the next row
  lcd.print("ON");
  delay(1000);
  lcd.clear();
  delay(100);

  lcd.print("Water Pump ");
  lcd.setCursor(0, 1); // display the second word in the next row
  lcd.print("ON");
  delay(1000);
  lcd.clear();
  delay(100);
}

void Intake_Valve()
{
  digitalWrite(relay1, LOW); // Turn the relay1 Off
  digitalWrite(relay2, LOW); // Turn the relay2 Off 

  lcd.print("Glycol Pump ");
  lcd.setCursor(0, 1); // display the second word in the next row
  lcd.print("OFF");
  delay(1000); 
  lcd.clear();
  delay(100);

  lcd.print("Water Pump ");
  lcd.setCursor(0, 1); // display the second word in the next row
  lcd.print("OFF");
  delay(1000);
  lcd.clear();
  delay(100);

  digitalWrite(relay3, HIGH); // Turn the relay3 ON
  digitalWrite(relay4, HIGH); // Turn the relay4 ON 

  lcd.print("Glycol Intake");
  lcd.setCursor(0, 1);
  lcd.print("Valve ON");
  delay(1000);
  lcd.clear();
  delay(100);

  lcd.print("Water Intake");
  lcd.setCursor(0, 1);
  lcd.print("Valve ON");
  delay(1000);
  lcd.clear();
  delay(100);
}
  
void Output_Valve()
{
  digitalWrite(relay3, LOW); // Turn the relay3 Off
  digitalWrite(relay4, LOW); // Turn the relay4 Off 
  
  lcd.print("Glycol Intake");
  lcd.setCursor(0, 1);
  lcd.print("Valve OFF");
  delay(1000);
  lcd.clear();
  delay(100);

  lcd.print("Water Intake");
  lcd.setCursor(0, 1);
  lcd.print("Valve OFF");
  delay(1000);
  lcd.clear();
  delay(100);
  digitalWrite(relay5, HIGH); // Turn the relay5 ON
  digitalWrite(relay6, HIGH); // Turn the relay6 ON 

  lcd.print("Glycol Output");
  lcd.setCursor(0, 1);
  lcd.print("Valve ON");
  delay(1000);
  lcd.clear();
  delay(100);

  lcd.print("Water Output");
  lcd.setCursor(0, 1);
  lcd.print("Valve ON");
  delay(1000);
  lcd.clear();
  delay(100);
}
  
void Electric_Motor()
{
  digitalWrite(relay5, LOW); // Turn the relay5 Off
  digitalWrite(relay6, LOW); // Turn the relay6 Off 

  lcd.print("Glycol Output");
  lcd.setCursor(0, 1);
  lcd.print("Valve OFF");
  delay(100);
  lcd.clear();
  delay(100);

  lcd.print("Water Output");
  lcd.setCursor(0, 1);
  lcd.print("Valve OFF");
  delay(100);
  lcd.clear();
   delay(1000);
   motor_button_state = digitalRead (motor_button);
   if(motor_button_state == HIGH)
   {
    digitalWrite(relay7, HIGH); // Turn the relay7 ON
    Serial.println("Electric Motor ON"); 
    Serial.println("\n"); 
    lcd.print("Electric Motor");
    lcd.setCursor(0, 1);
    lcd.print("Agitator ON");
    delay(100);
    lcd.clear();
    delay(100);
   }

  if(motor_button_state == LOW)
{
  digitalWrite(relay7, LOW); // Turn the relay7 Off
  Serial.println("Electric Motor OFF"); 
  Serial.println("\n"); 
  lcd.print("Electric Motor");
  lcd.setCursor(0, 1);
  lcd.print("Agitator OFF");
  delay(100);
  lcd.clear();
  delay(100);

}

  lcd.print("Wheel Probe");
  lcd.setCursor(0, 1);
  lcd.print("Fluid is Ready");
  delay(100);
  lcd.clear();
  delay(100);

  lcd.print("Would you like");
  lcd.setCursor(0, 1);
  lcd.print("to proceed?");
  delay(100);;
  lcd.clear();
  delay(100);
}
  
void Last_Output_Valve()
{
  button_State_1 = digitalRead(Last_Valve); // read new state of pushbutton connected to realy 8
  if (button_State_1 != last_Button_State_1) 
  {
  if (button_State_1 == HIGH) {
  digitalWrite(relay8, HIGH);  
  lcd.print("Mix Output");
  lcd.setCursor(0, 1);
  lcd.print("Valve ON");
  delay(100);
  lcd.clear();
  delay(100); 
  lcd.print("Operation");
  lcd.setCursor(0, 1);
  lcd.print("Done");
  }

  if (button_State_1 == LOW) 
  {
  digitalWrite(relay8, LOW);
  lcd.print("Mix Output");
  lcd.setCursor(0, 1);
  lcd.print("Valve is OFF");
  delay(100);
  }
  } 
}