#define LED1 23 
#define LED2 22
#define LED3 21
#define RedSW 2
void setup() {
 pinMode(LED1, OUTPUT);
 pinMode(LED2, OUTPUT);
 pinMode(LED3, OUTPUT);
 pinMode(RedSW, INPUT_PULLUP);
 digitalWrite(LED1,HIGH);
 digitalWrite(LED2,HIGH);
 digitalWrite(LED3,HIGH);
}
int status = 0;
void loop() {
 if(digitalRead(RedSW)==LOW)
 {
   if(++status>4) status =1;
   while(digitalRead(RedSW)==LOW) delay(50);
 }
 switch(status)
 {
  case 1: digitalWrite(LED1, LOW);digitalWrite(LED2, HIGH);
          digitalWrite(LED3, HIGH);break;
  case 2: digitalWrite(LED1, HIGH);digitalWrite(LED2, LOW);
          digitalWrite(LED3, HIGH);break;
  case 3: digitalWrite(LED1, HIGH);digitalWrite(LED2, HIGH);
          digitalWrite(LED3, LOW);break;
                          
}
delay(20);
}