# BME280 Temperature+Pressure+Humidity Sensor
sensor:
  - platform: bme280
    temperature:
      name: "${node_name} Temperature"
      id: temperature
    pressure:
      name: "${node_name} Pressure"
      id: pressure
    humidity:
      name: "${node_name} Humidity"
      id: humidity
    address: 0x77
    update_interval: 60s
  - platform: template
    name: "${node_name} Equivalent sea level pressure"
    id: pressure_sealevel
    lambda: |-
      const float STANDARD_ALTITUDE = ${altitude}; // in meters, see note
      return id(pressure).state / powf(1 - ((0.0065 * STANDARD_ALTITUDE) /
        (id(temperature).state + (0.0065 * STANDARD_ALTITUDE) + 273.15)), 5.257); // in hPa
    update_interval: 60s
    unit_of_measurement: 'hPa'
  - platform: template
    name: "${node_name} Absolute Humidity"
    lambda: |-
      const float mw = 18.01534;    // molar mass of water g/mol
      const float r = 8.31447215;   // Universal gas constant J/mol/K
      return (6.112 * powf(2.718281828, (17.67 * id(temperature).state) /
        (id(temperature).state + 243.5)) * id(humidity).state * mw) /
        ((273.15 + id(temperature).state) * r); // in grams/m^3
    accuracy_decimals: 2
    update_interval: 60s
    icon: 'mdi:water'
    unit_of_measurement: 'g/m³'
  - platform: template
    name: "${node_name} Dew Point"
    lambda: |-
      return (243.5*(log(id(humidity).state/100)+((17.67*id(temperature).state)/
      (243.5+id(temperature).state)))/(17.67-log(id(humidity).state/100)-
      ((17.67*id(temperature).state)/(243.5+id(temperature).state))));
    accuracy_decimals: 1
    update_interval: 60s
    unit_of_measurement: °C
    icon: 'mdi:thermometer-alert'