Unit CO2/CO2L Home Assistant Integration

This tutorial will introduce how to use the Unit CO2/CO2L sensor to integrate into Home Assistant, achieving real-time monitoring of carbon dioxide, temperature, and humidity.

Preparation

• SCD4x Datasheet
• SCD4X CO₂ and Temperature/Humidity Sensor

Note

Unit CO2/CO2L is a standalone sensor platform and requires an additional main controller (such as Atom series, Stamp series, Stick series, Core/Basic series, etc.) to be integrated into Home Assistant.

Modify Configuration

The I²C component needs to be enabled in the ESPHome configuration:

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

The GPIO pins here vary depending on the main controller used. For example, using Atom Lite as the 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"

Learn

Once added to the Dashboard, you can view the sensor data in Home Assistant.

Video