water_sensor.yaml

esphome:
  name: "water-tank-right"
  friendly_name: water_tank_right

esp8266:
  board: nodemcuv2

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "XXX+fDB9A="

ota:


wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Esphome-Web-238E1D"
    password: "RcDMK9XXXasNA7v"

captive_portal:

sensor:
  - platform: wifi_signal
    name: "WiFi Signal Sensor"
    update_interval: 60s          #to display WiFi signal strength
    
  - platform: ultrasonic
    trigger_pin: D5
    echo_pin: D6
    unit_of_measurement: "%"
    icon: "mdi:water-percent"
    accuracy_decimals: 0
    pulse_time: 200ms
    timeout: 4.0m
    update_interval: 5s
    name: "Rain Water storage" #You may change the tank name
    # tank height: 1.20m
    # distance between sensor and water brim 0.10m
    # full tank: tank height-0.10m = 1.10m
    # current reading: x
    # used = (x - 0.10m)
    # remaining = (1.10m - used)
    # percent = (remaining / 1.10m) * 100
    filters:
      - lambda: return (1-((x-.10)/1.10))*100;
      - filter_out: nan
      
  - platform: ultrasonic
    trigger_pin: D5
    echo_pin: D6
    update_interval: 1200000ms     #5 minutes. You can change this value
    name: "Remaining Water in Tank"
    unit_of_measurement: "l"
    accuracy_decimals: 0
    
    filters:
      - lambda: return (1-((x-.10)/1.10))*1000;
      - filter_out: nan