Examples of lejos.nxt.UltrasonicSensor.ping()

lejos.nxt.UltrasonicSensor.ping()

Send a single ping. The sensor operates in two modes, continuous and ping. When in continuous mode the sensor sends out pings as often as it can and the most recently obtained result is available via a call to getDistance. When in ping mode a ping is only transmitted when a call is made to this method. This sends a single ping and up to 8 echoes are captured. These may be read by making a call to getDistance and passing a suitable array. A delay of approximately 20ms is required between the call to ping and obtaining the results. The getDistance call automatically takes care of this. The normal getDistance call may also be used with ping, returning information for the first echo. Calling this method will disable the default continuous mode, to switch back to continuous mode call continuous. @return 0 if ok <> 0 otherwise

    // Continous-Modus testen (ist der default-Modus):
    sensor.continuous();
    assertEquals(255, sensor.getDistance());


    // Ping-Modus testen:
    sensor.ping();
    assertEquals(255, sensor.getDistance());
  }
  
  @Test
  public void testCercaContextConfig() {

    assertEquals(new String(charBuff7, 0, 7), sensor.getUnits());
    
    // �berpr�fung der Modus-Setzung
    sensor.continuous();
    assertEquals((byte) 2, sensor.getMode());
    sensor.ping();
    assertEquals((byte) 1, sensor.getMode());
  }


  @Test
  public void testCercaContextWithObstacles() {

    sensorStub.setObstacles(obstacles);
    sleep15ms();
    assertEquals(20, sensor.getDistance());


    // Ping-Modus testen:
    sensor.ping();
    int dist[] = new int[8];
    sensor.getDistances(dist);
    for (int i = 0; i < dist.length; i++) {
      assertEquals(20, dist[i]);
    }

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