This ESPHome integration utilizes a proximity sensor to monitor my water meter. The sensor detects the presence of metal, providing a pulse each time a full meter cycle is completed by recognizing the metal piece placed on the meter.
- Board: ESP8266 NodeMCU V2
- NPN proximity sensor (LJ18A3-8-Z/BX-5V)
| Board | NPN sensor cable |
|---|---|
| D6 / GPIO12 | Black |
| GND | Blue |
| 5V | Brown |
The device configuration can be found in watermeter.yaml
This configuration requires the following secrets to be defined in your secrets.yaml
wifi_ssid: wifi_name
wifi_password: wifi_password
ap_password: access_point_password
gateway: 192.168.0.1
subnet: 255.255.255.0
watermeter_static_ip: 192.168.0.123
watermeter_ota_password: ota_password
watermeter_encryption_key: abcdefghijklmnopqrstuvwxyz1234567890ABCDEFG=Choosing the right proximity sensor can be tricky; buying the LJ18A3 sensor eliminates the need for additional resistors. Ensure you select the LJ18A3-8-Z/BX-5V variant from AliExpress.com, as it comes with a built-in resistor and operates on 5V, allowing direct power from the ESP.
This device offers a Home Assistant service for adjusting the meter value without firmware recompilation. For instance, if the totalWaterUsage deviates from the actual water meter reading, you can update it directly within Home Assistant.
service: esphome.watermeter_set_water_usage
data:
meter_value: 123,456