I can not get the ultrasonic device to detect an object, (wall ect). I have the ultrasonic device connect to trigger D21 echo D22 and even tried to swapping the trigger with the echo. If I look at the radar the distance is always 255. and I see two red spots that I think are the end points. I removed the device from the servo and tried not moving it, but held a moving object in front of it trying to see if there was a change on the radar screen. I set the distance to one and still did not get a change on the screen

Is there some kind of test I could perform to see if the device is working?

Please note I just received this developer kit and I'm use to the protocol of this website or how to communicate with fellow users. I'm not sure where to see my reply for thiis help message