Proximity Sensor holder for Water Meter
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Proximity sensor holder for your water meter. Electronics and software by Pieter Brinkman, ESPhome Smart Water Meter
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- Printables
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- Other House Equipment
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- Creative Commons — Attribution — Share Alike
Uploaded on request - originally posted on my blog in 2023:
I built a “smart” water meter with ESPHome and Home Assistant, based on the project by Pieter Brinkman.
Hardware
The project uses a 5V LJ18A3-8Z/BX Proximity sensor from AliExpress. Since I already had some ESP32 boards, that’s what I used.
The ESP32 runs on 3.3 Volt. The sensor needs 5 Volts, so in theory a level shifter is required. Even though the Espressif CEO claims that the chip is 5V tolerant, I still added a protection circuit to the proximity sensor, limiting the input voltage to safe values.
Sensor holder for water meter
I designed a custom holder for the proximity sensor. The water meter has a small rotating metal disc, and positioning the sensor is quite important to get reliable readings.
The holder is a prototype but seems to work well enough.
Use a couple of 3-4 mm diameter pins to hold the sensor in place, see pictures.
3D Printing
I printed this holder on a Prusa Mini in Prusament PETG, no supports needed.
Project status
Note that earlier in 2025 I replaced this sensor with a HomeWizard smart water meter sensor, so I won't be updating this design anymore. The Fusion 360 / STEP files are included.