bool gauche;
bool droit;

void setup() {
  // put your setup code here, to run once:
DRDD=B11111111;
PORTD=B00000001;
gauche=true;
}

void loop() {
  // put your main code here, to run repeatedly:
 if gauche
 digitalWrite(PORTD);
 PORTD=PORTD<<1;
 delay(1000);

}