---
sensor:
  - platform: adc
    pin: ${pin_vbatt}
    name: "Battery voltage"
    id: battery_voltage
    unit_of_measurement: "V"
    accuracy_decimals: 1
    device_class: "voltage"
    entity_category: "diagnostic"
    disabled_by_default: true
    update_interval: 30s
    attenuation: auto
    filters:
        - multiply: 4.11

  - platform: copy
    id: battery_percent
    source_id: battery_voltage
    name: "Battery level"
    unit_of_measurement: "%"
    accuracy_decimals: 0
    device_class: "battery"
    entity_category: "diagnostic"
    filters:
      - lambda: return (x - 2.7) / (4.2 - 2.7) * 100;
      - clamp:
          min_value: 0
          max_value: 100