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Datasheet and User Guide
7Semi CO2 Temperature Humidity Probe Arduino Library

Compact, Accurate, and Reliable Air Quality Monitoring: Achieve precise measurement of CO2, temperature, and humidity with a durable metal probe and easy I2C interface.
The 7Semi CO2, Temperature & Humidity Sensor Probe is designed for accurate and efficient monitoring of indoor air quality parameters. With one of the smallest form factors available, this sensor unlocks new possibilities in compact and cost-sensitive applications. Housed in a durable metal probe with a 1-metre cable, it offers high breathability, corrosion resistance, and tolerance to challenging environments.
Built on advanced thermal conductivity sensing technology, this factory-calibrated probe ensures accurate CO2 measurement while also monitoring temperature and relative humidity. It features a typical accuracy of +-0.2 C (temperature) and +-1.8 %RH (humidity), with fast response times of just 24 seconds. Operating at 3.3V with low current consumption, it is well-suited for battery-powered devices, IoT systems, smart HVAC equipment, greenhouses, and environmental monitoring projects.
Key Features

High-Accuracy CO2 Measurement (4005000 PPM): Ensures precise monitoring for indoor air quality and research.

Integrated Multi-Sensor: Simultaneously measures CO2, temperature, and relative humidity.

Durable Metal Probe with 1 m Cable: Provides robust housing, corrosion resistance, and breathability.

Fast Response Times: 2s (temperature) and 4s (humidity) for reliable real-time data.

Factory Calibrated with NIST Traceability: Guarantees accuracy and dependable results.

Low Power Consumption: Optimised for battery-powered and portable devices.

I2C Digital Communication: Simple interface for seamless integration with microcontrollers and embedded systems.

Operating Voltage: 3.3V

Digital Humidity and Temperature Sensor Probe I2C Interfacing with MCU

Digital Humidity and Temperature Sensor Probe Applications