ESPHome Capacitive Water Tank Level Sensor

Using a capacitive sensor is possible to “sense” the presence of water within a tank fixing it at a fixed height, so when the water goes down this minimum level the sensor will trigger some alert system.

For this purpose I’ve used a XKC-Y25-NPN sensor that is nicely compatible with a Wemos D1 ESP8266 module and some few ESPHome code lines.

The wiring requires just three connectors, pay attention to the sensor wires colors, different suppliers could change the order of them:

3D printed case available here

ESPHome code is the following:

esphome:
  name: plants-water-tank-sensor
  platform: ESP8266
  board: nodemcuv2
      
# Enable logging
logger:

# Enable Home Assistant API
api:

ota:
  password: "670d70c6dd4ea29b3b9b66b1109dc0d8"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  
binary_sensor:
  - platform: gpio
    pin:
      number: D2
      mode: INPUT_PULLUP
    name: "Plants Water Tank Low Level"
    filters:
      - delayed_on: 10ms

The binary sensor will be available on ESPHome Integration

and usable on any dashboard

or automation:

alias: Allarme acqua irrigazione
description: ''
trigger:
  - type: turned_on
    platform: device
    device_id: 107cdcec7a2e43bb990398295828afa5
    entity_id: binary_sensor.plants_water_tank_low_level
    domain: binary_sensor
    for:
      hours: 0
      minutes: 0
      seconds: 2
condition: []
action:
  - service: notify.mobile_app_sm_a525f
    data:
      message: Low Level Water
mode: single