Uint ENV-IV Home Assistant Integration

The Uint ENV-IV sensor platform allows you to use BMP280 temperature & pressure sensors, with SHT40 temperature & humidity sensor.

Info

Since Unit ENV-IV is only a sensor platform, additional micro controllers are required (like Atom Lite, Core2, CoreS3 etc) to integrate the device into Home Assistant.

These two sub sensors are supported by ESPHome.

Also you can reference in ESPHome for the latest configurations:

Setup Sensor

I²C component is required for device setup:

yaml 
# Example configuration entry for ESP32
i2c:
  sda: GPIOXX
  scl: GPIOXX
  scan: true

These GPIO pins may varies depend on the device you are using. For an example, Atom Lite:

yaml 
# I2C Bus on Grove Port (HY2.0-4P)
i2c:
  sda: GPIO26
  scl: GPIO32

Example configuration for Unit ENV-IV:

yaml 
sensor:
  - platform: sht4x
    temperature:
      id: sht40_temp
      name: "Temperature"
    humidity:
      id: sht40_humi
      name: "Relative Humidity"
    address: 0x44

  - platform: bmp280_i2c
    temperature:
      name: "BME280 Temperature"
      id: bmp280_temp
      oversampling: 16x
    pressure:
      name: "BME280 Pressure"
      id: bmp_pressure
    address: 0x76

Alternatively, you can calculate the altitude, absolute humidity and dew points use some empirical formulas (for reference only):

yaml 
sensor:
  ...
  # add the following under the previous sensor declarations
  - platform: template
    name: "Altitude"
    lambda: |-
      const float STANDARD_SEA_LEVEL_PRESSURE = 1013.25; //in hPa, see note
      return ((id(bmp280_temp).state + 273.15) / 0.0065) *
        (powf((STANDARD_SEA_LEVEL_PRESSURE / id(bmp_pressure).state), 0.190234) - 1); // in meter
    update_interval: 15s
    icon: 'mdi:signal'
    unit_of_measurement: 'm'

  - platform: absolute_humidity
    name: "Absolute Humidity"
    temperature: sht40_temp
    humidity: sht40_humi

  - platform: template
    name: "Dew Point"
    lambda: |-
      return (243.5*(log(id(sht40_humi).state/100)+((17.67*id(sht40_humi).state)/
      (243.5+id(sht40_temp).state)))/(17.67-log(id(sht40_humi).state/100)-
      ((17.67*id(sht40_temp).state)/(243.5+id(sht40_temp).state))));
    unit_of_measurement: °C
    icon: 'mdi:thermometer-alert'

Note

Calculating the altitude with the BMP280 sensor accurately requires this value to be known at sea level for your location and day. This can be achieved by replacing the global constant STANDARD_SEA_LEVEL_PRESSURE by for example pulling this value live from the internet or a stationary sensor via MQTT.

Add Sensor to Home Assistant

After adding the device to the dashboard

Monitoring the temperature

Info

There are two temperature lines since BMP280 also has a temperature sensor.

Monitor changes in atmospheric pressure

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