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Hello,
I believe that I am not seeing an echo. I'm guessing it is due to mounting, but while I am trying that I thought I would post to see if I missed something else.
I've read the docs, including http://www.ti.com/lit/an/snaa270/snaa270.pdf on mounting. Currently I have the sensor mounted to a glass jar using silicon (to jar surface) and hot glue. I'm going to try glue against the surface of the glass next, but here is the waveform that I have in the current setup. It looks very much like the beginning of the waveform depicted here: https://e2e.ti.com/support/sensor/ultrasonic/f/991/t/467713 (looks like ringdown)
In the waveform below I've set a cursor at +137us, where I would expect the echo to appear (10cm water level).
Any suggestions, or wisdom from past experience appreciated.
And the config:
The connection of the transducer to the glass was the problem. Applied some loctite super glue (contains CYA) and the used a glue gun to cover it. Anyway, the above is what it looks like with a bad physical connection with the container.
Here is what the scope looks like with the glued connection. Note that I have a 2 channel scope, so the yellow is now the stop signal. There is a vertical cursor where the start normally occurs. Also noted that the ringdown is much less pronounced.
