What is the value of the Ultrasonic Rangefinder when it cannot detect an object?

The Ultrasonic Rangefinder offers a specific output value that indicates its inability to detect an object. When the sensor is unable to identify any object within its detection range, it typically returns a value of -1. This negative value serves as a clear indicator that no valid distance measurement can be obtained, distinguishing it from outputs that represent measurable distances.

In contrast, choices like 0, 1, or 10 would imply that the sensor has detected something, even at a minimum range, which does not align with the functioning of the Ultrasonic Rangefinder. Zero could suggest that an object is detected at an indeterminate distance, while positive values would normally indicate distance readings to detected objects. Therefore, -1 is the correct representation denoting that no object has been detected.