I read that you can use one pin for both trigger and echo. I tried it with techel's library and it didn't work. I have downloaded the latest ( 1.8 ) For wiring, I did a simple "Y" connector with pin15 of the esp splitting to the sr04 echo and trigger. As per the release notes v1.4 - Released 7/1…

hc sr04 with 1 wire for trigger and echo?

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