pause Until

Make your program wait until an some object is detected in proximity of the sensor.


How an object is detected depends on the distance and movement thresholds set for the sensor. A threshold is a number that is some distance in centimeters or the strength of ultrasonic sound. You can set a distance to detect something that is far, near, or is sending out ultrasound (like the sensor of another robot in the area). The three thresholds you can set are:

  • near: a distance to set to detect objects coming close
  • far: a distance to set to detect objects farther away but not as close as the near threshold
  • detected: the strength of ultrasound to needed to detect presence of another ultrasonic sensor

Both near and far have distance thresholds set in centimeters. The detect threshold is a value of strength the ultrasonic sound in decibels.


  • event: the object detection action to wait for. The detection types (events) are:
    • detected: some other object is sending out an ultrasonic sound
    • near: the sensor detected something within the distance of the near threshold


Wait for another object sending out ultrasonic sound. Show a message on the screen when it’s dectected.

brick.showString("Waiting for another", 1);
brick.showString("robot to appear...", 2);
brick.showString("Hey, I just heard", 1)
brick.showString("Something!", 2);

See also

on event