#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {12, 11, 10, 9};
byte colPins[COLS] = {8, 7, 6, 5};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
int trig = 4 ;
int echo = 3 ;
int M_L= 22;
int f1=23;
int f2=24;
int f3=25;
int f4=26;
int f5=27;
int M_F=28;
int up=29;
int down=30;
void setup() {
  Serial.begin(9600);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(M_L, OUTPUT);
  pinMode(M_F, OUTPUT);
  pinMode(f1, OUTPUT);
  pinMode(f2, OUTPUT);
  pinMode(f3, OUTPUT);
  pinMode(f4, OUTPUT);
  pinMode(f5, OUTPUT);
  pinMode(up, OUTPUT);
  pinMode(down, OUTPUT);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("HELLO");
  delay(2000);
  lcd.clear();
  }
void loop() {
  digitalWrite(trig, 0);
  delayMicroseconds(2);
  digitalWrite(trig, 1);
  delayMicroseconds(10);
  digitalWrite(trig, 0);
  delayMicroseconds(2);
  float distance = pulseIn(echo, 1);
  float duration = (distance * 0.0343) / 2 ;
  delay(1000);
  Serial.print(duration);
  Serial.println("cm");
  if(duration >=50&& duration<=60){
  digitalWrite(M_L,1);
  delay(1000);
  digitalWrite(M_L,0);
  }
  char key = keypad.getKey() ;
  if(key=='1'){
    F1();
  }
  if(key=='2'){
    F2();
  }
  if(key=='3'){
    F3();
  }
  if(key=='4'){
    F4();
  }
  if(key=='5'){
    F5();
  }
  if(key=='*'){
    UP();
  }
  if(key=='#'){
    DOWN();
  }
  }
  void F1(){
    digitalWrite(f1,1);
    digitalWrite(f2,0);
    digitalWrite(f3,0);
    digitalWrite(f4,0);
    digitalWrite(f5,0);
    digitalWrite(up,0);
    digitalWrite(down,0);
    digitalWrite(M_F,1);
    delay(500);
    digitalWrite(M_F,0);
      lcd.clear();
  lcd.setCursor(6,0);
  lcd.print("Floor1");
 
  }
  void F2() {
    digitalWrite(f1,0);
    digitalWrite(f2,1);
    digitalWrite(f3,0);
    digitalWrite(f4,0);
    digitalWrite(f5,0);
    digitalWrite(up,0);
    digitalWrite(down,0);
    digitalWrite(M_F,1);
    delay(500);
    digitalWrite(M_F,0);
     lcd.clear();
  lcd.setCursor(6,0);
  lcd.print("Floor2");
  
  }
  void F3() {
    digitalWrite(f1,0);
    digitalWrite(f2,0);
    digitalWrite(f3,1);
    digitalWrite(f4,0);
    digitalWrite(f5,0);
    digitalWrite(up,0);
    digitalWrite(down,0);
    digitalWrite(M_F,1);
    delay(500);
    digitalWrite(M_F,0);
      lcd.clear();
  lcd.setCursor(6,0);
  lcd.print("Floor3");
  
  }
  void F4() {
   digitalWrite(f1,0);
    digitalWrite(f2,0);
    digitalWrite(f3,0);
    digitalWrite(f4,1);
    digitalWrite(f5,0);
    digitalWrite(up,0);
    digitalWrite(down,0);
    digitalWrite(M_F,1);
    delay(500);
    digitalWrite(M_F,0);
     lcd.clear();
  lcd.setCursor(6,0);
  lcd.print("Floor4");
  
}
  void F5() {
    digitalWrite(f1,0);
    digitalWrite(f2,0);
    digitalWrite(f3,0);
    digitalWrite(f4,0);
    digitalWrite(f5,1);
    digitalWrite(up,0);
    digitalWrite(down,0);
    digitalWrite(M_F,1);
    delay(500);
    digitalWrite(M_F,0);
     lcd.clear();
  lcd.setCursor(6,0);
  lcd.print("Floor5");
  
}
  void UP(){
  digitalWrite(up,1);
  digitalWrite(down,0);
  lcd.setCursor(9,1);
  lcd.print("UP");
}
  void DOWN(){
  digitalWrite(up,0);
  digitalWrite(down,1);
  lcd.setCursor(7,1);
  lcd.print("DOWN");
  }