int pin1 =3;
int pin2 =4;
int pin3 =5;
int pin4 =6;
int delayt =500;   


void setup() {
 pinMode(pin1, OUTPUT);
 pinMode(pin2, OUTPUT);
 pinMode(pin3, OUTPUT);
 pinMode(pin4, OUTPUT);

}

void loop() {
 
 digitalWrite(pin1, LOW);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, LOW);
 digitalWrite(pin4, LOW);
 delay(delayt);

 digitalWrite(pin1, HIGH);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, LOW);
 digitalWrite(pin4, LOW);
 delay(delayt);

 digitalWrite(pin1, LOW);
 digitalWrite(pin2, HIGH);
 digitalWrite(pin3, LOW);
 digitalWrite(pin4, LOW);
 delay(delayt);

 digitalWrite(pin1, HIGH);
 digitalWrite(pin2, HIGH);
 digitalWrite(pin3, LOW);
 digitalWrite(pin4, LOW);
 delay(delayt);

 digitalWrite(pin1, LOW);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, LOW);
 delay(delayt);

 digitalWrite(pin1, HIGH);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, LOW);
 delay(delayt);

 digitalWrite(pin1, LOW);
 digitalWrite(pin2, HIGH);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, LOW);
 delay(delayt);

 digitalWrite(pin1, HIGH);
 digitalWrite(pin2, HIGH);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, LOW);
 delay(delayt);

 digitalWrite(pin1, LOW);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, LOW);
 digitalWrite(pin4, HIGH);
 delay(delayt);

 digitalWrite(pin1, HIGH);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, LOW);
 digitalWrite(pin4, HIGH);
 delay(delayt);

 digitalWrite(pin1, LOW);
 digitalWrite(pin2, HIGH);
 digitalWrite(pin3, LOW);
 digitalWrite(pin4, HIGH);
 delay(delayt);

 digitalWrite(pin1, HIGH);
 digitalWrite(pin2, HIGH);
 digitalWrite(pin3, LOW);
 digitalWrite(pin4, HIGH);
 delay(delayt);

 digitalWrite(pin1, LOW);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, HIGH);
 delay(delayt);

 digitalWrite(pin1, HIGH);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, HIGH);
 delay(delayt);

 digitalWrite(pin1, LOW);
 digitalWrite(pin2, LOW);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, HIGH);
 delay(delayt);

 digitalWrite(pin1, LOW);
 digitalWrite(pin2, HIGH);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, HIGH);
 delay(delayt);

digitalWrite(pin1, HIGH);
 digitalWrite(pin2, HIGH);
 digitalWrite(pin3, HIGH);
 digitalWrite(pin4, HIGH);
 delay(delayt);
}