ESPHome salt level sensor config

salt-level-sensor.yml

esphome:
  name: salt-level-sensor

esp8266:
  board: d1_mini

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "<HA API KEY>"

ota:
  password: "<OTA PASSWORD>"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  domain: <DOMAIN>

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Salt-Level-Sensor"
    password: "<AP PASSWORD>"

captive_portal:

sensor:
  # Uptime sensor.
  - platform: uptime
    name: salt-level-sensor Uptime

  # WiFi Signal sensor.
  - platform: wifi_signal
    name: salt-level-sensor WiFi Signal
    update_interval: 60s

  - platform: ultrasonic
    trigger_pin: D2
    echo_pin: D1
    name: "Salt Level (percentage)"
    icon: "mdi:cup-water"
    update_interval: 5sec
    filters:
    # Calculates in %
    # Replace 0.42 by the height of your container. From the sensor to the bottom.
    # I used this website to know how I should multiply my values :https://www.skillsyouneed.com/num/percent-change.html 
    - lambda: return (0.42-x)*(100/0.42);
    - filter_out: nan
    unit_of_measurement: "%"
    
  - platform: ultrasonic
    trigger_pin: D2
    echo_pin: D1
    name: "Salt Level (cm)"
    icon: "mdi:cup-water"
    update_interval: 5sec
    filters:
    # Replace the 0.42 by the height of your container. From the sensor to the bottom.
    # I multiplied by 100 in order to get CM since the sensor works in meters
    - lambda: return (0.42-x)*100;
    - filter_out: nan
    unit_of_measurement: "cm"