The specs claim this ultrasound is 40kHz.I've tried putting drops of water on the transducer element and at that point it just stopped working (gave me a 0 cm response). Now going from transducer to air to water to air might not be a good idea as the interface between each medium would give a pretty strong reflection with little energy going through.I guess there are two directions I can go at this:1- test by nearly submerging the ultrasound elements in hotglue so that the sound wouldnt have an interface when coming out and would go straight to the outside world --> this will permanently mess it up if it doesnt work2- place the transducers deeper in the bumper so that they are more protected from rain and maybe put them in a tube to protect them from most rain directionstill no response from manufacturer
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