int motorPin1 = 8;   
int motorPin2 = 9;   
int motorPin3 = 10;  
int motorPin4 = 11;  
int delayTime = 500;
 
void setup(){
     pinMode(motorPin1, OUTPUT);
     pinMode(motorPin2, OUTPUT);
     pinMode(motorPin3, OUTPUT);
     pinMode(motorPin4, OUTPUT);
}

void loop(){
     digitalWrite(motorPin1, HIGH); 
     digitalWrite(motorPin2, LOW);
     digitalWrite(motorPin3, LOW);
     digitalWrite(motorPin4, LOW);
     delay(delayTime);
     digitalWrite(motorPin1, LOW); 
     digitalWrite(motorPin2, HIGH);
     digitalWrite(motorPin3, LOW);
     digitalWrite(motorPin4, LOW);
     delay(delayTime);
     digitalWrite(motorPin1, LOW); 
     digitalWrite(motorPin2, LOW);
     digitalWrite(motorPin3, HIGH);
     digitalWrite(motorPin4, LOW);
     delay(delayTime);
     digitalWrite(motorPin1, LOW); 
     digitalWrite(motorPin2, LOW);
     digitalWrite(motorPin3, LOW);
     digitalWrite(motorPin4, HIGH);
     delay(delayTime);
}



