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  • You might want to use an oscilloscope to watch the trigger pulse and the received echo at the pins. This would separate hardware issues from software problems. Anyway, since you use a simple sketch that worked for you in the past, it is presumably the hardware. Try another sensor. Commented Sep 21 at 8:49
  • Despite being called ultrasonic, those sensors are perfectly audible. So you don't need anything but ears to check if, at least, the transmitter is working or not. Commented Sep 21 at 9:40
  • @Matt - perfectly audible to a 20 year old... (-: Commented Sep 21 at 13:01
  • Are you using batteries? If so, what kind? If a power supply, what is the voltage and maximum current capability? Commented Sep 21 at 13:40
  • @JimMack Nah, my twenty are in the last millenium. Commented Sep 21 at 17:39