#define sw1 4
#define sw2 3 //กำหนดขาสวิตซ์
#define sw3 2
boolean flag = 0;   
byte state =1 ;
byte state2 =1 ;
unsigned long pre = 0;
char key;
int x ;
void setup() {
Serial.begin(9600);
DDRB = 0b11111111;
pinMode(sw1, INPUT_PULLUP);
pinMode(sw2, INPUT_PULLUP);
pinMode(sw3, INPUT_PULLUP);
Serial.println("---------------------------------------------------------------");
}
void loop() {
unsigned long cur = millis();
  if(cur - pre > 500){ //ความเร็วการหน่วงเวลา คล้ายๆ delay 
    pre = cur;
    flag = 1;
  }
if(digitalRead(sw1)==0){ //ถ้ากด 1 จะเข้าเงื่อนไขของเลข 1 
  x = 1;
  }
else if(digitalRead(sw2)==0){ //ถ้ากด 2 จะเข้าเงื่อนไขของเลข 2
  x = 2;
}
else if(digitalRead(sw3)==0){ //ถ้ากด 3 จะเข้าเื่อนไขของเลข 3
  x = 3;
}
Serial.println(x);
if(x == 1){
if(flag ==1){
      flag = 0;
      switch(state){
        case 1:
              PORTB = 0b00001;
              state = 2;
              break;
        case 2:
              PORTB =  0b00010;
              state = 3;
              break;
        case 3:
              PORTB =  0b00100;
              state = 4;
              break;
        case 4:
              PORTB = 0b01000;
              state =5;
              break;
        case 5:
              PORTB = 0b10000;
              state = 1;
              break;
              default:
              state = 1;
      }
}
}
else if(x == 2){
  if(flag ==1){
    flag = 0;
    switch(state){
      case 1:
            PORTB = 0b10000;
              state = 2;
              break;
        case 2:
              PORTB =  0b01000;
              state = 3;
              break;
        case 3:
              PORTB =  0b00100;
              state = 4;
              break;
        case 4:
              PORTB = 0b00010;
              state =5;
              break;
        case 5:
              PORTB = 0b10001;
              state = 1;
              break;
              default:
              state = 1 ;
    }
  }
}
else if(x == 3){
  if(flag ==1){
    flag = 0;
    switch(state){
      case 1:
            PORTB = 0b00000;
              state = 2;
              break;
        case 2:
              PORTB =  0b11111;
              state = 1;
              break;
              default:
              state = 1;
      }
    }
  }
}