專案地址：https://www.tinkercad.com/things/1maNW6J7e7k-elevator-simulation

#include <LiquidCrystal.h>
#define pwm1     9
#define pwm2     10
//#define tmpPin   A0
//#define piezoPin 8
//boolean direction = 0;
//const int tempmax=35;
//int speed;
int i=1;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); 
#define btn3 6
#define
 
 btn2 7
#define btn1 8 
boolean buttonState1;
boolean buttonState2;
boolean buttonState3;




void setup() {
 pinMode(pwm1, OUTPUT); 
 pinMode(pwm2, OUTPUT); 
 lcd.begin(16,2);
 Serial.begin(9600);
 pinMode(btn2,INPUT_PULLUP);
 pinMode(btn3,INPUT_PULLUP);
 pinMode(btn1,INPUT_PULLUP);
}





void loop() {
buttonState1 
 
= digitalRead(btn1);
buttonState2 = digitalRead(btn2);
buttonState3 = digitalRead(btn3);  
  digitalWrite(pwm1,LOW);
  digitalWrite(pwm2,LOW);
  
  //------------------------------------------
  //On clicking on 3rd floor's button
  
  if(buttonState3 == HIGH){
    while(i<3){   
    i++; 
  digitalWrite(pwm1, LOW);
  digitalWrite(pwm2, HIGH);
 lcd.print(
 
"On the way to ");
      lcd.setCursor(0,1);
       lcd.print("floor ");  
 lcd.print(i);
      delay(1000);
      lcd.clear();}
   i=3;
   lcd.clear();
  }
  
  //-------------------------------------------------
  //On clicking on 2nd floor's button
  
  if(buttonState2==HIGH){
    
    if(i>2){
      while(i>2) {
      i--;
 digitalWrite(pwm1, HIGH); 
 digitalWrite(pwm2, LOW); 
    lcd.print("On the way to");
        lcd.setCursor(0,1);
        lcd.print("floor ");
        lcd.print(i);
   delay(1000);}
    }
    
    if(i<2){ 
      while(i<2){
        i++;
    digitalWrite(pwm1, LOW);
  digitalWrite(pwm2, HIGH);
   lcd.print("On the way to");
       lcd.setCursor(0,1);
    lcd.print("floor ");
        lcd.print(i);
        delay(1000);}      
    }    
    
  i=2;lcd.clear();
  }

  //-----------------------------------------
  //On clicking on 1st floor's button
  
  if(buttonState1 == HIGH){
    
  if(i>1){
    while(i>1) {
    i--;
 digitalWrite(pwm1, HIGH); 
 digitalWrite(pwm2, LOW); 
    lcd.print("On the way to");
     lcd.setCursor(0,1);
    lcd.print("floor ");
      lcd.print(i);
      delay(1000);
       lcd.clear();}
    i=1;    lcd.clear();}
    
  }
}