i2c:
  sda: 4
  scl: 5
  scan: true
  id: bus_a

sensor:
  - platform: bme280
    temperature:
      name: Temp${sn}
      id: bme280_temperature
    pressure:
      name: Press${sn}
      id: bme280_pressure
    humidity:
      name: HumidityRel${sn}
      id: bme280_humidity
    address: 0x76
    update_interval: 15s
  # Templates from https://esphome.io/cookbook/bme280_environment.html
  - platform: template
    name: HumidityAbs${sn}
    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(bme280_temperature).state) /
        (id(bme280_temperature).state + 243.5)) * id(bme280_humidity).state * mw) /
        ((273.15 + id(bme280_temperature).state) * r); // in grams/m^3
    accuracy_decimals: 2
    update_interval: 15s
    icon: 'mdi:water'
    unit_of_measurement: 'g/m³'
  - platform: template
    name: DewPt${sn}
    lambda: |-
      return (243.5*(log(id(bme280_humidity).state/100)+((17.67*id(bme280_temperature).state)/
      (243.5+id(bme280_temperature).state)))/(17.67-log(id(bme280_humidity).state/100)-
      ((17.67*id(bme280_temperature).state)/(243.5+id(bme280_temperature).state))));
    unit_of_measurement: °C
    icon: 'mdi:thermometer-alert'