pause Until
Make your program wait until an some object is detected in proximity of the sensor.
sensors.ultrasonic1.pauseUntil(UltrasonicSensorEvent.ObjectDetected);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.
Parameters
- event: the object detection action to wait for. The detection types (events) are:
detected: some other object is sending out an ultrasonic soundnear: the sensor detected something within the distance of the near threshold
Example
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);
sensors.ultrasonic1.pauseUntil(UltrasonicSensorEvent.ObjectDetected);
brick.showString("Hey, I just heard", 1)
brick.showString("Something!", 2);