#define VM 13
#define AM 12
#define VD 14

void setup() {
 pinMode(VM, OUTPUT);
 pinMode(AM, OUTPUT);
 pinMode(VD, OUTPUT);
}

void loop() {
  digitalWrite(VM, HIGH);
  digitalWrite(AM, LOW);
  digitalWrite(VD, LOW);
  delay(1000);

  digitalWrite(VM,LOW);
  digitalWrite(AM, HIGH);
  digitalWrite(VD, LOW);
  delay(1000);

  digitalWrite(VM, LOW);
  digitalWrite(AM, LOW);
  digitalWrite(VD, HIGH);
  delay(1000);
}