Solarmi CO2 sensor, ESPHome

Xtend Solarmi ESP32C34M

CO2 sensor built for ESPHome.

The SCD4x is a next-generation miniature CO2 sensor from Sensirion. This sensor utilizes the NDIR photoacoustic sensing principle along with Sensirion's patented PASens and CMOSens technologies, offering high accuracy at an unbeatable price in the smallest form factor. SMD mounting enables cost- and space-efficient sensor integration combined with maximum design freedom. On-chip signal compensation is achieved through the built-in SHT4x humidity and temperature sensor.

CO2 is a key indicator of indoor air quality (IAQ), as high levels negatively affect cognitive performance and human well-being. The SCD4x enables intelligent ventilation systems to regulate airflow in the most energy-efficient and comfortable way for occupants. In addition, indoor air quality monitors and other connected devices based on the SCD4x chip can help maintain low CO2 concentrations for a healthy and productive environment.

Features:

• Highly accurate measurements
• Integrated automatic self-calibration function for enhanced data reliability

Ideal for:

• Environmental parameter sensing
• Automation based on occupancy or room conditions
• Local monitoring in Home Assistant

Key product highlights
The CO2 sensor for ESPHome is a sensor designed for ESPHome and Home Assistant systems. It helps Home Assistant automations respond to environmental data, occupancy, or room conditions.

Compatibility
Designed for local use within a Home Assistant smart home system. Products labeled as "Made For ESPHome" use the correct "Made For ESPHome" compatibility designation and are intended for local control based on the ESPHome platform.

BASIC SPECIFICATIONS

Input: USB (5V/1A)
Wi-Fi type: 2.4 GHz
Wi-Fi chip: ESP32C3
Measurement range: 400–2000 ppm
Accuracy: 50 ppm