The 7Semi SCD40 CO₂, Temperature & Humidity Sensor Breakout is a compact, high-accuracy sensing module designed for indoor environmental and air-quality monitoring. It integrates a photoacoustic NDIR CO₂ sensor with built-in humidity and temperature measurement and communicates via I²C, making it suitable for smart-home, automation, HVAC, IoT and embedded systems requiring precise CO₂ data.

Technical Specifications:

• Target Gas: CO₂ (carbon dioxide)
• CO₂ Measurement Range: 0–40,000 ppm
• CO₂ Accuracy: ±(50 ppm + 5% of reading) within 400–2,000 ppm range
• Temperature Accuracy: ±0.8 °C typical
• Humidity Accuracy: ±6% RH typical
• CO₂ Response Time: ~60 seconds (τ63%)
• Humidity Response Time: ~90 seconds (τ63%)
• Supply Voltage: 2.4 V to 5.5 V
• Interface: I²C digital communication
• Operating Temperature: –10 °C to +60 °C
• Typical Current Consumption: ~15 mA active
• Sensor Package Size: ~10.1 × 10.1 × 6.5 mm
• Compatibility: 3.3 V logic microcontroller platforms

Features:

•       Integrated CO₂, temperature and humidity measurement
•      Photoacoustic NDIR sensing technology for high sensitivity
•      Factory calibrated for accurate ready-to-use outputs
•      I²C communication for easy integration
•      Compact breakout module for prototyping
•      Suitable for long-term indoor monitoring applications

Applications:

•      Indoor air-quality monitoring and smart ventilation
•      Smart-home automation and HVAC control
•      IoT sensing nodes and remote environmental logging
•      Educational, research and laboratory monitoring environments
•      Portable CO₂, temperature and humidity monitoring devices