7Semi SCD40 CO2, Temperature and Humidity Sensor Breakout Mini

The 7Semi SCD40 CO₂, Temperature and Humidity Sensor Breakout Mini brings professional-grade indoor air quality sensing into a compact, developer-friendly module. Powered by Sensirion’s advanced SCD40 photoacoustic CO₂ sensor, this breakout delivers highly accurate carbon dioxide monitoring along with integrated temperature and humidity sensing, making it an excellent solution for smart HVAC systems, air quality stations, IoT devices, automation systems, and environmental monitoring projects.

Built on Sensirion’s PASens® photoacoustic NDIR technology, the SCD40 offers reliable CO₂ measurement from 400 ppm up to 40,000 ppm with excellent accuracy and long-term stability. The integrated humidity and temperature sensor also helps improve overall sensing compensation and environmental reliability.

With its compact breakout design, simple I2C interface, and Qwiic-compatible connectivity, the module integrates easily with Arduino, ESP32, STM32, Raspberry Pi, and other popular development platforms. Low-power operation and automatic self-calibration features make it ideal for both portable and continuously operating indoor air quality systems.

Features

• High-accuracy CO₂ sensing using Sensirion PASens® photoacoustic NDIR technology

• CO₂ measurement range from 400 ppm to 40,000 ppm

• Excellent CO₂ accuracy up to ±(50 ppm + 5% of reading)

• Integrated temperature and humidity sensing for environmental monitoring

• Compact mini breakout design for embedded and space-constrained projects

• Digital I2C interface for easy microcontroller integration

• Qwiic compatible for fast plug-and-play prototyping

• Low power operation suitable for portable and battery-powered systems

• Automatic self-calibration for long-term measurement stability

• Works seamlessly with Arduino, ESP32, STM32, and Raspberry Pi

• Operating temperature range: -40°C to +80°C

Why Choose This Module?

• More accurate and stable than low-cost MQ-series gas sensors

• True NDIR-based CO₂ sensing for reliable indoor air quality monitoring

• Combines CO₂, temperature, and humidity sensing in one compact module

• Excellent choice for HVAC, smart buildings, classrooms, greenhouses, and automation systems

• Easy to integrate using standard I2C communication

• Designed for long-term reliable environmental monitoring applications

What’s Included

• 1x 7Semi SCD40 CO₂, Temperature and Humidity Sensor Breakout Mini

• Qwiic-compatible onboard connectors