Overview

The SCD41-2HA module measures CO₂ (carbon dioxide) is designed for direct integration into Home Assistant using the ESPHome integration.

It is based on the professional-grade Sensirion SCD41 sensor, a high-precision photoacoustic NDIR CO₂ sensor well suited for indoor air quality monitoring.

The SCD41-2HA module comes fully assembled in a compact 56 × 58 × 28 mm enclosure and requires no hardware configuration.

⚙️ Technical Specifications

Sensor: Sensirion SCD41

Technology: Photoacoustic NDIR

CO₂ Measurement Range: 400 to 5000 ppm

CO₂ Accuracy: ±50 ppm – ±2.5% of measured value

Unlike most other CO₂ sensors, this module lets you choose between manual calibration and auto-calibration.

Additional Measurements with the combined AHT20 + BMP280 sensor (included) :

    Temperature :  ± 0,3 °C
    Humidity : ± 2 %
    Pressure : ± 0,12 hPa (relative) et ± 1 hPa (absolue)

Connectivity: Wi-Fi

Integration: Native Home Assistant support via ESPHome integration

Power Supply: 5 V via USB Type-C connector

🏠 Home Assistant Integration

Installation steps:

Plug the module into a 5 V USB-C power supply.

Connect it to your Wi-Fi network.

It will be automatically detected, or you you will need to add it via the ESPHome integration.

The CO₂, humidity, temperature and pressure entities will appear automatically in Home Assistant.

🧰 Typical Use Cases

Indoor air quality monitoring

Automating ventilation or air purifiers based on CO₂ levels

Displaying live air quality data on Home Assistant dashboards

All orders are dispatched within 3 business days.

In the rare event of a delay, I will proactively reach out to keep you updated. Your satisfaction and project timeline are my priorities!