#define LED1 2
#define LED2 3
#define LED3 4
#define LED4 5
void setup() 
{
  Serial.begin(9600);
  pinMode(LED1,OUTPUT);
  pinMode(LED2,OUTPUT);
  pinMode(LED3,OUTPUT);
  pinMode(LED4,OUTPUT);
}
void loop() 
{
  digitalWrite (LED1,HIGH);
  digitalWrite (LED2,LOW);
  digitalWrite (LED3,LOW);
  digitalWrite (LED4,LOW);
  delay(200);
  digitalWrite (LED1,LOW);
  digitalWrite (LED2,HIGH);
  digitalWrite (LED3,LOW);
  digitalWrite (LED4,LOW);
  delay(200);
  digitalWrite (LED1,LOW);
  digitalWrite (LED2,LOW);
  digitalWrite (LED3,HIGH);
  digitalWrite (LED4,LOW);
  delay(200);
  digitalWrite (LED1;LOW);
  digitalWrite (LED2,LOW);
  digitalWrite (LED3,LOW);
  digitalWrite (LED4,HIGH);
  delay(200);
}