ESPHome config for Topas Septic, Temperature (DS18B20) and Water Level Meter (ultrasonic AJ-SR04M )

topas-meter.yaml

esphome:
  name: topas-meter
  comment: "${device_description}"
  friendly_name: Topas Meter

substitutions:
  device_description: "Topas Septic Temperature and Water Level Meter"
  device_name: "topas-meter"
  water_warn_prc: "80" # water level in prc warning
  diag_updt_interval: 60s
  waterlevel_updt_interval: 60s

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: !secret api_encryption_key

ota:
  platform: esphome
  password: !secret ota_password

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Topas-Meter Fallback Hotspot"
    password: !secret hotspot_password

captive_portal:

# DS18B20 Dallas sensor
one_wire:
  - platform: gpio
    pin: GPIO16
#dallas:
#  - pin: 15
#    update_interval: ${diag_updt_interval}

text_sensor:
  # Uptime Human Readable
  - platform: template
    name: Uptime HR
    id: uptime_human
    icon: mdi:clock-start

number:
  # receiving camera height in cm
  - platform: template
    id: rec_cam_height
    name: Receiving Camera Height
    icon: mdi:water-plus
    optimistic: true
    mode: slider
    step: 10
    entity_category: config
    min_value: 100
    max_value: 300
    initial_value: 100
    restore_value: yes
    unit_of_measurement: cm  

sensor:
  # Uptime sensor.
  - platform: uptime
    name: Uptime
    entity_category: "diagnostic"
    id: esp_uptime
    update_interval: ${diag_updt_interval}
    on_raw_value:
      then:
        - text_sensor.template.publish:
            id: uptime_human
            state: !lambda |-
              int seconds = round(id(esp_uptime).raw_state);
              int days = seconds / (24 * 3600);
              seconds = seconds % (24 * 3600);
              int hours = seconds / 3600;
              seconds = seconds % 3600;
              int minutes = seconds /  60;
              seconds = seconds % 60;
              return (
                (days ? String(days) + "d " : "") +
                (hours ? String(hours) + "h " : "") +
                (minutes ? String(minutes) + "m " : "") +
                (String(seconds) + "s")
              ).c_str();   

  # WiFi Signal sensor.
  - platform: wifi_signal
    name: "WiFi Signal dB"
    id: wifi_signal_db
    entity_category: "diagnostic"
    update_interval: ${diag_updt_interval}
  - platform: copy # Reports the WiFi signal strength in %
    source_id: wifi_signal_db
    name: "WiFi Signal Percent"
    filters:
        - lambda: return min(max(2 * (x + 100.0), 0.0), 100.0);
    unit_of_measurement: "%"
    entity_category: "diagnostic"
    device_class: ""

  # Waterlevel sensor / AJ-SR04M  
  - platform: ultrasonic
    trigger_pin: 
      number: 25
      inverted: true
    echo_pin: 
      number: 26
    name: "Waterlevel cm"
    id: water_level
    update_interval: ${waterlevel_updt_interval}
    pulse_time: 20us
    timeout: 4m
    filters:
    # sensor works in meters. 0.25 - blind zone
    - lambda: |-
         if (x <= 0.25) return id(rec_cam_height).state-1;
         return id(rec_cam_height).state-x*100;
    unit_of_measurement: "cm"
  - platform: copy
    source_id: water_level
    id: water_level_prc
    name: "Waterlevel percent"
    unit_of_measurement: "%"
    filters:
      - lambda: return x/id(rec_cam_height).state*100;

    # DS18B20 Temperature  
  - platform: dallas_temp
    name: "Temperature"
    update_interval: ${diag_updt_interval}

  - platform: internal_temperature
    name: "ESP Temperature"
    entity_category: "diagnostic"

# Enable Web server.
web_server:
  port: 80