Airthings Wave Radon: ESPHome Sensor / Proxy

esphome-esp32-wave-radon-proxy.yml

## 
## See https://github.com/kevin-david/home-assistant-shared/blob/main/esphome/esp32-wave-radon-proxy.yml for future updates
## 

substitutions:
  name: "<YOUR_DEVICE_NAME_HERE>"
  wave_serial: "<YOUR_SERIAL_OR_UNIQUE_ID_HERE>"
  # See https://esphome.io/components/sensor/airthings_ble.html for how to find this
  # Note: If you have your ESP32 connected to your Wave device, it might cause problems syncing with your phone
  # Suggest powering down the ESP device before running firmware updates or attempting to sync with AirThings cloud, if you care about that
  wave_bluetooth_mac: "<YOUR_AIRTHINGS_WAVE_RADON_MAC_HERE>"
  # Note: This will impact battery life of the Wave device.
  # Radon only seems to be updated about every ~hour but temp/humidity can be much more frequent
  # Choose according to your needs
  airthings_update_interval: "30min"

esphome:
  name: $name

esp32:
  board: esp32dev
  framework:
    type: esp-idf
    version: recommended

# Enable logging
logger:
  level: DEBUG # Required for the tracker to show the device

api:

ota:

esp32_ble_tracker:

bluetooth_proxy:

# Wave2 sensor bytes https://ztroop.github.io/wave-reader-utils/specs/#ti-over-the-air-download-service
sensor:
  # Conversion factor for Radon - https://help.airthings.com/en/articles/3119854-radon-what-is-the-difference-between-pci-l-and-bq-m3
  - platform: ble_client
    type: characteristic
    ble_client_id: "airthings_$wave_serial"
    update_interval: $airthings_update_interval
    name: "Airthings ${wave_serial} Radon: Short Term"
    id: "airthings_${wave_serial}_radon"
    icon: 'mdi:radioactive'
    service_uuid: 'B42E4A8E-ADE7-11E4-89D3-123B93F75CBA'
    characteristic_uuid: 'b42e4dcc-ade7-11e4-89d3-123b93f75cba'
    unit_of_measurement: "pCi/L"
    accuracy_decimals: 2
    lambda: |-
      uint16_t radon_sta = x[4];
      radon_sta += (x[5] << 8);
      return (float)(radon_sta / 37.0f);
    filters:
      - filter_out: nan

  - platform: ble_client
    type: characteristic
    ble_client_id: "airthings_$wave_serial"
    update_interval: $airthings_update_interval 
    name: "Airthings ${wave_serial} Radon: Long Term"
    id: "airthings_${wave_serial}_radon_long_term"
    icon: 'mdi:radioactive'
    service_uuid: 'B42E4A8E-ADE7-11E4-89D3-123B93F75CBA'
    characteristic_uuid: 'b42e4dcc-ade7-11e4-89d3-123b93f75cba'
    unit_of_measurement: "pCi/L"
    accuracy_decimals: 2
    lambda: |-
      uint16_t radon_lta = x[6];
      radon_lta += (x[7] << 8);
      return (float)(radon_lta / 37.0f);
    filters:
      - filter_out: nan

  - platform: ble_client
    type: characteristic
    ble_client_id: "airthings_$wave_serial"
    update_interval: $airthings_update_interval 
    name: "Airthings ${wave_serial} Temperature"
    id: "airthings_${wave_serial}_temperature"
    icon: 'mdi:thermometer'
    service_uuid: 'B42E4A8E-ADE7-11E4-89D3-123B93F75CBA'
    characteristic_uuid: 'b42e4dcc-ade7-11e4-89d3-123b93f75cba'
    unit_of_measurement: "°F"
    accuracy_decimals: 2
    lambda: |-
      uint16_t temperature = x[8];
      temperature += (x[9] << 8);
      float temp = temperature / 100.0f;
      return (float)((temp * (9.0f/5.0f)) + 32.0f);
    filters:
      - filter_out: nan

  - platform: ble_client
    type: characteristic
    ble_client_id: "airthings_$wave_serial"
    update_interval: $airthings_update_interval 
    name: "Airthings ${wave_serial} Relative Humidity"
    id: "airthings_${wave_serial}_relative_humidity"
    icon: 'mdi:water-percent'
    service_uuid: 'B42E4A8E-ADE7-11E4-89D3-123B93F75CBA'
    characteristic_uuid: 'b42e4dcc-ade7-11e4-89d3-123b93f75cba'
    unit_of_measurement: "%"
    accuracy_decimals: 1
    lambda: |-
      uint8_t humidity = x[1];
      float humidity_calc = humidity / 2.0f;
      return humidity_calc;
    filters:
      - filter_out: nan

  - platform: wifi_signal
    name: "$name WiFi Signal"
    update_interval: 5min
    
  - platform: uptime
    name: "$name Uptime"
    id: uptime_sensor
    update_interval: 5min

ble_client:
  - mac_address: $wave_bluetooth_mac
    id: "airthings_$wave_serial"

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "$name Flbk"
    password: !secret fallback_password

Many thanks for this!!!