/* 
   
    ************************************************************* 
            Arduino Basic Elevator Simulation  
             
  		  www.ulasdikme.com 
  		  
     ********************************************************** 
   */ 
   
   
  int i=1; // the value represents where elevator stay ( fisrt time elevator start in the first floor 
  int btn4=8; // represents the 4 th floor 
  int btn3=7;  //             2 nd floor 
  int btn2=6; //                3 th floor 
  int btn1=5;  //               1 st floor  
   
  int buttonState=0; 
  int buttonState2=0; 
  int buttonState3=0; 
  int buttonState4=0; 
   
   
  int motorPin1 = 10;  
  int motorPin2 = 11;  
  int motorPin3 = 12;  
  int motorPin4 = 13; 
   
  const int latchPin = 3;  // Pin connected to Pin 12 of 74HC595 (Latch) 
  const int dataPin  = 4;  // Pin connected to Pin 14 of 74HC595 (Data) 
  const int clockPin = 2;  // Pin connected to Pin 11 of 74HC595 (Clock) 
   
  const byte numbers[16] = { 
    0b11111100, 
    0b01100000, 
    0b11011010, 
    0b11110010, 
    0b01100110, 
    0b10110110, 
    0b10111110, 
    0b11100000, 
    0b11111110, 
    0b11100110, 
    0b11101110, 
    0b00111110, 
    0b10011100, 
    0b01111010, 
    0b10011110, 
    0b10001110 
  }; 
   
  void setup() { 
   
    pinMode(latchPin, OUTPUT); 
    pinMode(clockPin, OUTPUT); 
    pinMode(dataPin, OUTPUT); 
   
       
   pinMode(motorPin1, OUTPUT);  
   pinMode(motorPin2, OUTPUT);  
   pinMode(motorPin3, OUTPUT);  
   pinMode(motorPin4, OUTPUT);  
    int delayTime = 50;  
     
     
    Serial.begin(9600); 
   
    pinMode(btn4,INPUT); 
    pinMode(btn2,INPUT); 
    pinMode(btn3,INPUT); 
    pinMode(btn1,INPUT); 
   
   
  } 
   
  void loop() { 
   // Serial.println("You are on the i st floor");  
  buttonState = digitalRead(btn1); 
  buttonState2 = digitalRead(btn2); 
  buttonState3 = digitalRead(btn3); 
  buttonState4 = digitalRead(btn4); 
  show(numbers[i]); //write number on the 7 segment display  which floor elevator stays 
   
  /*------------------------------------------------------------------*/ 
  // 4 th floor required codes 
  if(buttonState4 == HIGH){ 
  while(i<4){    
      i++; 
          up(); 
      
   Serial.print("You are on the "); 
      Serial.print(i); 
      Serial.println("floor"); 
     show(numbers[i]); 
       
    } 
    i=4; 
    show(numbers[i]); 
   
    }// end of the buttonState4 
  //------ end of the 4th floor ------ 
  /*------------------------------------------------------------------*/ 
   
   
  /*------------------------------------------------------------------*/ 
   //start of the 3 td floor codes ---- 
    if(buttonState3==HIGH){ 
     
      if(i>3){ 
        while(i>3) { 
        i--; 
        down(); 
      Serial.print("You are on the "); 
      Serial.print(i); 
      Serial.println("floor"); 
     show(numbers[i]); 
        } 
      } 
      if(i<3){ // person is waiting on the first or second floor. Call the elevater 
        while(i<3){ 
          i++; 
          up(); 
     Serial.print("You are on the "); 
      Serial.print(i); 
      Serial.println("floor"); 
      show(numbers[i]); 
      } 
           
      }     
       
       
    i=3; //assign the elevator value to the three 
     show(numbers[i]); 
        delay(1000); 
      
   
         
    } // end of the buttonState3 
    //end of the 3 td floor codes ----  
   /*------------------------------------------------------------------*/  
   
   
   
     
     
   /*------------------------------------------------------------------*/  
  // 2 nd floor required codes 
    if(buttonState2 == HIGH){ 
    if(i>2){ 
      while(i>2) 
      { 
      i--; 
      down(); 
      Serial.print("You are on the "); 
      Serial.print(i); 
      Serial.println("floor"); 
  	show(numbers[i]); 
      }   
      i=2;    
  	} 
        if(i<2){ 
        while(i<2){ 
          i++; 
          up(); 
      Serial.print("You are on the "); 
      Serial.print(i); 
      Serial.println("floor"); 
  	show(numbers[i]); 
  	 
        } 
        i=2; 
  	  show(numbers[i]); 
        delay(1000); 
      } 
         
      }// end of the buttonState2 
  // --- end of the 2 th floor codes --- 
  /*------------------------------------------------------------------*/ 
   
   
   
  /*------------------------------------------------------------------*/ 
  // start of the 1 st floor codes ------ 
    if(buttonState == HIGH){ 
      if(i>1){ 
        while(i>1){ 
         
        i--; 
        down(); 
      Serial.print("You are on the "); 
      Serial.print(i); 
      Serial.println("floor"); 
  	show(numbers[i]);	 
  		 
      } 
      } 
      i=1;        
  	show(numbers[i]); 
      delay(1000); 
    }// end of the buttonState1 
    //--- end of the first floor codes----- 
    /*------------------------------------------------------------------*/ 
     
     
     
  }  
   
   
   
   
  // ------- up function which is for to go up elevator 
  void up() { // each floor distance where it works to up 
   
    for(int b=0; b<300; b++){ 
    show(numbers[i]); 
    digitalWrite(motorPin1, LOW); 
    digitalWrite(motorPin2, LOW); 
    digitalWrite(motorPin3, LOW); 
    digitalWrite(motorPin4, HIGH); 
    delay(3); 
    digitalWrite(motorPin1, LOW); 
    digitalWrite(motorPin2, LOW); 
    digitalWrite(motorPin3, HIGH); 
    digitalWrite(motorPin4, LOW); 
    delay(3); 
    digitalWrite(motorPin1, LOW); 
    digitalWrite(motorPin2, HIGH); 
    digitalWrite(motorPin3, LOW); 
    digitalWrite(motorPin4, LOW); 
    delay(3); 
    digitalWrite(motorPin1, HIGH); 
    digitalWrite(motorPin2, LOW); 
    digitalWrite(motorPin3, LOW); 
    digitalWrite(motorPin4, LOW);   
    delay(3); 
    } 
   
  } 
   
  void down() { // each floor distance where it works to down 
    
   
   for(int a=0;a<300;a++){ 
    show(numbers[i]); 
   digitalWrite(motorPin1, HIGH);  
   digitalWrite(motorPin2, LOW);  
   digitalWrite(motorPin3, LOW);  
   digitalWrite(motorPin4, LOW);  
   delay(3); 
   digitalWrite(motorPin1, LOW);  
   digitalWrite(motorPin2, HIGH);  
   digitalWrite(motorPin3, LOW);  
   digitalWrite(motorPin4, LOW);  
   delay(3); 
   digitalWrite(motorPin1, LOW);  
   digitalWrite(motorPin2, LOW);  
   digitalWrite(motorPin3, HIGH);  
   digitalWrite(motorPin4, LOW);  
   delay(3); 
   digitalWrite(motorPin1, LOW);  
   digitalWrite(motorPin2, LOW);  
   digitalWrite(motorPin3, LOW);  
   digitalWrite(motorPin4, HIGH);  
   delay(3); 
    
   } 
  } 
   
  void show( byte number) 
  { 
    // Use a loop and a bitwise AND to move over each bit that makes up 
    // the seven segment display (from left to right, A => G), and check 
    // to see if it should be on or not 
    for(int j = 0; j <= 7; j++) 
    { 
      byte toWrite = number & (0b10000000 >> j);  
   
      // If all bits are 0 then no point writing it to the shift register, 
      // so break out and move on to next segment. 
      if(!toWrite) {  
        continue;  
      } 
   
      // Otherwise shift it into the register 
      shiftIt(toWrite); 
    } 
  } 
   
  void shiftIt (byte data) 
  { 
    // Set latchPin LOW while clocking these 8 bits in to the register 
    digitalWrite(latchPin, LOW); 
   
    for (int k=0; k <= 7; k++) 
    { 
   
      // clockPin LOW prior to sending a bit 
      digitalWrite(clockPin, LOW);  
   
      // Note that in our case, we need to set pinState to 0 (LOW) for 
      // “On” as the 74HC595 is sinking current when using a common 
      // anode display. If you want to use a common cathode display then 
      // switch this around. 
      if ( data & (1 << k) ) 
      { 
        digitalWrite(dataPin, LOW); // turn “On” 
      } 
      else 
      { 
        digitalWrite(dataPin, HIGH); // turn “Off” 
      } 
   
      // and clock the bit in 
      digitalWrite(clockPin, HIGH); 
    } 
   
    //stop shifting out data 
    digitalWrite(clockPin, LOW);  
   
    //set latchPin to high to lock and send data 
    digitalWrite(latchPin, HIGH); 
   
    // put delay here if you want to see the multiplexing in action! 
    //delay(100); 
  }