HC-SR04 Ultrasonic sensor waterproof mount
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HC-SR04 mount for water tank level detection
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This is my latest attempt to get the HC-SR04 to measure reliably the water level in a tank.
Previous attempts with the waterproof JSN-SR4T ended in erratic results due to multiple reflections from the tank walls especially at low water levels.
This mount consists of a waterproof box secured by a hollow bolt which mounts on the top cover of the tank. The bolt is hollow to allow for the cable pass through.
You need 4 pieces of 3mm inserts for the four screws that hold the box cover.
I also use hot glue round the senors to seal the box from humidity.
Finally I am covering the two ultrasonic transducers with kitchen film to prevent any contact with moisture.
See the result on home assistant dashboard in the third picture!