Wave2 Battery & esphome

gistfile1.txt

# https://esphome.io/guides/automations.html#interval-component
interval:
  # trigger the update to fetch battery
  - interval: ${temp_update_interval}
    then:
      - ble_client.ble_write:
          id: "airthings_${wave_serial}"
          service_uuid: "B42E4A8E-ADE7-11E4-89D3-123B93F75CBA"
          characteristic_uuid: "B42E50D8-ADE7-11E4-89D3-123B93F75CBA" # 0x10
          value: [ 0x6d ]
          
sensor:
  - platform: template
    name: "Airthings ${wave_serial} Battery Voltage"
    id: "airthings_${wave_serial}_battery_v"
    unit_of_measurement: "V"
    accuracy_decimals: 2
    update_interval: never

  - platform: copy
    name: "Airthings ${wave_serial} Battery Level"
    id: "airthings_${wave_serial}_battery_level"
    source_id: "airthings_${wave_serial}_battery_v"
    unit_of_measurement: "%"
    device_class: battery
    accuracy_decimals: 0
    filters:
      - calibrate_linear:
          - 0.0 -> 0
          - 2.0 -> 0
          - 3.0 -> 100
          
  - platform: ble_client
    id: "airthings_${wave_serial}_config"
    type: characteristic
    ble_client_id: "airthings_${wave_serial}"
    service_uuid: "B42E4A8E-ADE7-11E4-89D3-123B93F75CBA"
    characteristic_uuid: "B42E50D8-ADE7-11E4-89D3-123B93F75CBA" # 0x10
    internal: true
    notify: true
    lambda: |-
      uint16_t battery = x[26] + (x[27] << 8);
      float battery_f = battery / 1000.0f;
      id(airthings_${wave_serial}_battery_v).publish_state(battery_f);

      // following might be a better calculation vs the linear calibrate.. need to verify with the app
      float battery_pct = 100 * (battery_f - 2.0 ) / (3.0 - 2.0);
      //id(airthings_${wave_serial}_battery_level).publish_state(battery_pct);
      ESP_LOGI("custom", "calc'ed battery pct %f", battery_pct);
      
      return 0.0;
      
button:
  # flash the ring light
  - platform: template
    name: "${wave_serial} Ring Light"
    on_press:
      - ble_client.ble_write:
          id: "airthings_${wave_serial}"
          service_uuid: "B42E4A8E-ADE7-11E4-89D3-123B93F75CBA"
          characteristic_uuid: "B42E50D8-ADE7-11E4-89D3-123B93F75CBA" # 0x10
          value: [ 0x67, 0x08 ]