#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);


const int startButtonPin = 2;     // the number of the start pushbutton pin
const int lowButtonPin = 4;     // the number of the low pushbutton pin
const int topButtonPin = 7;     // the number of the angle pushbutton pin
const int motorDirPin =  12;      
const int motorBreakPin =  9;     
int buzzerPin = 8; 

// variables for reading the pushbuttons status
boolean startButtonState = 0;         
boolean lowButtonState = 0;        
boolean topButtonState = 0;  


void setup() {
   
    pinMode(motorDirPin, OUTPUT);
    pinMode(motorBreakPin, OUTPUT);
    pinMode(buzzerPin, OUTPUT);
    
    pinMode(startButtonPin, INPUT_PULLUP);
    pinMode(topButtonPin, INPUT_PULLUP);
    pinMode(lowButtonPin, INPUT_PULLUP);
    
    lcd.init();                      
    lcd.backlight();
    
    Serial.begin(9600);
}


void loop() {   // read the state of the pushbutton value:
   startButtonState = ! digitalRead(startButtonPin);
   lowButtonState = digitalRead(lowButtonPin);
   topButtonState = digitalRead(topButtonPin);
         Serial.print(startButtonState);
         Serial.print(lowButtonState);
         Serial.println(topButtonState);
         delay(200);

         lcd.clear();
       
        lcd.setCursor(0,0);
        lcd.print("PRESS THE BUTTON");

         

   if (startButtonState == HIGH) {
      lowButtonState = digitalRead(lowButtonPin);
      topButtonState = digitalRead(topButtonPin);
      
     if(lowButtonState == HIGH){
        Serial.println("Start");
        Serial.print(lowButtonState);
          lcd.clear();
          lcd.setCursor(0,0);
          lcd.print("WARNING !!!");
          lcd.setCursor(0,1);
          lcd.print("WORK IN PROGRESS");
        do{
          digitalWrite(motorDirPin, HIGH);
          digitalWrite(motorBreakPin, LOW);
          analogWrite(3, 255);

          topButtonState = digitalRead(topButtonPin);
        }while(topButtonState == LOW);

       digitalWrite(motorDirPin, LOW);
       digitalWrite(motorBreakPin, HIGH);
       delay(2000);
       
        do{
          digitalWrite(motorDirPin, LOW);
          digitalWrite(motorBreakPin, LOW);
          analogWrite(3, 255);
         lowButtonState = digitalRead(lowButtonPin);
         
        }while(lowButtonState == LOW);

        digitalWrite(motorDirPin, LOW);
        digitalWrite(motorBreakPin, HIGH);
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("Work is completed");
        for (int i=0; i<6; i++) {
          digitalWrite(buzzerPin, HIGH);
          delay(500);
          digitalWrite(buzzerPin, LOW);
          delay(500);
          }
       
       }

        if (lowButtonState == LOW){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("PREPARING...");

        do{
          digitalWrite(motorDirPin, LOW);
          digitalWrite(motorBreakPin, LOW);
          analogWrite(3, 255);
          lowButtonState = digitalRead(lowButtonPin);
          digitalWrite(buzzerPin, HIGH);
          delay(200);
          digitalWrite(buzzerPin, LOW);
          delay(200);
         
        }while(lowButtonState == LOW);
        
        digitalWrite(motorDirPin, LOW);  
        digitalWrite(motorBreakPin, HIGH);  //stop the motor

        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("MACHINE IS READY");
        lcd.setCursor(0,1);
        lcd.print("PRESS THE BUTTON");
        delay(2000);
        }
      }
    
   
    
  }