Vex Ultrasonic Range Module
 

We tried finding distance using this module, and after connecting it correctly, it keeps either not working (isRangeValid() is false, returns 0 on getRangeInches() and getRangeMM()) or returning infinity (isRangeValid() is true, returns Double.POSITIVE_INFINITY (the infinity symbol) from getRangeInches() and getRangeMM()). Has anyone else had luck getting one of these working in Java? It's hooked up to the DIO ports currently.

Re: Vex Ultrasonic Range Module
 

Is there a good target in front of it? If yes, at what distance?

Re: Vex Ultrasonic Range Module
 

I placed it facing towards the floor, within a few inches (<10). It continued to return ∞. I rebooted the robot, and hasDistance() returned false, and it returned 0 again. (I haven't changed how I wired this sensor!)