Unit CO2/CO2L Home Assistant Integration

Unit CO2/CO2L mainly uses the SCD40/SCD41 CO2 and temperature/humidity sensors.

Both sensors support ESPHome, making it easy to integrate with Home Assistant.

• SCD4x Datasheet

You can also refer to ESPHome for the latest configuration:

• SCD4X CO₂ and Temperature/Humidity Sensor

Configure the sensor

Enable the I²C component in the ESPHome configuration:

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

The GPIO pins vary depending on the main controller you use. For example, if you use Atom Lite as the main controller:

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

Example configuration for Unit CO2/CO2L:

sensor:
  - platform: scd4x
    co2:
      name: "CO2"
    temperature:
      name: "Temperature"
    humidity:
      name: "Humidity"

Add the sensor to Home Assistant

After adding it to the Dashboard, you can view the sensor data in Home Assistant.

Video