We are trying to use the JSN-SR20-Y1 in always receiving mode. We did something similar with the HC-SR04 as per this article (Spread Spectrum Phased Array Sonar - Hackster.io) and picked up the signal at top left pin of the U1 (and that worked great). But we can't figure out where to pick up a simiar unprocessed signal at the JSN-SR20-Y1. I also was not able to find a circuit diagram. Please help. We need to use this sensor as we need it to be waterproof (which the HC-SR04 is not).
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