To save money, I bought a two-piece ultrasonic sensor (which was not designed for Arduino). It does look similar to other ultrasonic sensors. I have looked around and I can't find an informative data sheet or a tutorial. I don't even know which side is negative! The codes on the sides are: UST-40T, …

help with ultrasonic transducers!

system September 10, 2012, 9:43am 8

A much simpler drive circuit can be made from a MAX232.
Receivers are always a lot trickier though.

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