Smart Water Usage Sensor Mount

Finally got water meters installed. I already track power usage on Home Assistant and wanted to add water as well.

The water supply company installed a B-meters GSD8 meter, which seems to be popular in central and eastern Europe.
Did a little research and I found that you can track water usage for these with an inductive proximity sensor. I wanted to use something shorter than that tube sensor, so I chose a 5V SN04 N1 sensor. All else I needed was an ESP32 and a couple of resistors.

The mount uses notches on the meter, so you need to push it on the meter and then twist to lock it in place.

Additional parts:

• SN04 N1 5V NPN Inductive Proximity Sensor;

• Any ESP32 dev board.  I used ESP32 S3

• B-meters GSD8 meter;

• 1x 10K resistor per sensor/meter.

• Sufficient power supply for ESP32
  

Example ESP Home code.
To have persistent values, use the Home Assistant Utility Meter helper.
Wiring example.

The final model got flipped upside down, so please flip it 180 degrees before printing.
Printed in PLA:

• 0.2 mm layer height;

• 2 wall layers;

• 20% infill;

• No supports.