So did you found any solution when working with multiple Ultrasonic Sensors. I have a similar requirement where I need to use 400+ sensors and still trying to investigate what all issue I may face when deployed in production. I tried to look for information on the datasheet if any information is given in terms of Signal strength etc to activate the sensor but couldnt find any article.
Share me your inputs how you dealt with this. Thanks in advance!..
Ultrasonic transducers are resonant speaker/microphones, but the resonant Q isn't that high that you
could have 400 different frequencies - that would involve extreme manufacturing tolerances anyway,
making things very expensive per sensor.
The best approach is to multiplex in the time domain, allowing enough time between each transducer operating
and the next. Clearly this takes time, and synchronization.
A good transducer will have the output given in dB for a given input voltage. Similarly the sensitivity.