Water Level Sensor for Leak Detection ... In this case, Arduino distance sensors use sound to work out how distant objects are. Ultrasonic waves that humans can't hear are emitted by the sensor ...

He suggest instead that I have them plumb a fill line that we can attach to our irrigation system as a new zone and use that to ... about building an ultrasonic water level sensor, connected ...

In his write-up, [Mike] started by listing all the different sensors he had considered to measure the oil level and ... the picture above using PVC parts. Enclosed are the ultrasonic sensor ...