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Welcome to the forum!
To your issue: The HC-SR04 sensor needs some time measurement (“flight time” of ultrasonic signal). Thus, you’ll need an Arduino or Raspberry to do the job.
Hi all,
Can anybody confirm that this information is still correct. I had ordered a series of add-on devices, because this knowledge page shows "Ultrasonic proximity sensors" in the list of supported sensors. Therefore I thought that the hc-sr04 would be supported. So it would be real bummer if it would not be supported after all...
Thanks!!
Bart
This facebook discussion mentions that the URM09 distance sensor is supported by the add-on. That sensor has a shared trigger and echo pin, unlike the hc-sr04 sensors 
It would have been useful if the documentation had mentioned this...
Looking at the pinout of the add-on, I assume proximity sensors like hc-sr04 will/can never be supported?
Now I am confused. Some Shelly related sites (like e.g. this one) sell hc-sr04 sensors "for addon plus". From that I would expect it should be working together?
I would appreciate a lot if somebody could illuminate me.
Because I received yesterday a series of Add-on hats as a father's day present, so it would be awful if I cannot use them...
