       case '+':
         interval = 2000;
         break;
+      case 'R':
+        reactive = true;
+        break;
+      case 'r':
+        reactive = false;
       default:
         if (48 < incomingByte && incomingByte < 58)
         {

      Serial.print("OBSTACLE !");Serial.println(distance);
    }

    motorstate = MOVE_BACKWARDS;
    interval = 100;
  } else {
    //motorstate=STILL;
    //digitalWrite(led,LOW);


int noAction = STAYSTILL;

bool reactive = true;

int const RELAXED = 0;
int const PHOTOTROPISM = 1;
