#define led_red 4
#define led_blue 5
#define led_orange 6
#define led_pink 7
int time=100;
void setup() {
  pinMode(led_red,OUTPUT);
  pinMode(led_blue,OUTPUT);
  pinMode(led_orange,OUTPUT);
  pinMode(led_pink,OUTPUT);

}
 
void loop() {
digitalWrite(led_red,HIGH);
digitalWrite(led_blue,LOW);
digitalWrite(led_orange,LOW);
digitalWrite(led_pink,LOW);
delay(time);
digitalWrite(led_red,LOW);
digitalWrite(led_blue,HIGH);
digitalWrite(led_orange,LOW);
digitalWrite(led_pink,LOW);
delay(time);
digitalWrite(led_red,LOW);
digitalWrite(led_blue,LOW);
digitalWrite(led_orange,HIGH);
digitalWrite(led_pink,LOW);
delay(time);
digitalWrite(led_red,LOW);
digitalWrite(led_blue,LOW);
digitalWrite(led_orange,LOW);
digitalWrite(led_pink,HIGH);
delay(time);

}