Ping.waitForLower(triggerPort, echoPort, distance, [ezbIndex])
|triggerPort||Trigger port used by the ultrasonic distance sensor.|
|echoPort||Echo port used by the ultrasonic distance sensor.|
|distance||Exclusive upper bound on value to wait for.|
|ezbIndex (optional)||Board index of the EZB to use.|
ReturnsThe value measured from the ultrasonic distance sensor that is lower than distance as a number between 0 and 255.
Suspends execution of the script until the value read from the ultrasonic distance sensor is lower than distance. The value read from the ultrasonic distance sensor is returned when the script resumes execution.