7Semi_CO2_Temperature_Humidity_I2C_Probe_Arduino_Library

This Arduino library provides support for the 7Semi CO₂, Temperature & Humidity I2C Sensor Probe — a reliable, compact, and low-power environmental sensor for embedded and IoT systems. It communicates over I²C and outputs real-time measurements of carbon dioxide (CO₂ in ppm), temperature (°C), and relative humidity (%RH).

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🌐 Features

• Supports I²C communication at standard 100kHz
• CO₂ measurement in parts per million (ppm)
• Temperature measurement in degrees Celsius (°C)
• Humidity measurement in %RH
• Works with 3.3V.
• Lightweight and optimized for AVR, STM32, ESP32/ESP8266, and RP2040

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🔧 Hardware Required

• 7Semi CO₂ Temperature & Humidity I2C Probe
• Arduino-compatible development board
• I²C connections: SDA, SCL
• Power supply: 3.3V

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🚀 Getting Started

1. Installation via Arduino Library Manager

1. Open the Arduino IDE
2. Navigate to:
   • Sketch > Include Library > Manage Libraries… (IDE 1.x), or
   • Use the Library Manager sidebar in IDE 2.x
3. Search for: 7Semi_CO2_Temperature_Humidity_I2C_Probe_Arduino_Library
4. Click Install

Alternatively, clone or download this repository and place it in your libraries/ folder.

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2. I²C Wiring

CO2TH Sensor	Arduino Board
SDA	A4 (UNO) / D21 (ESP32)
SCL	A5 (UNO) / D22 (ESP32)
VCC	3.3V
GND	GND

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📟 Example Output

CO2: 415 ppm    Temperature: 25.37 °C    Humidity: 45.63 %RH
CO2: 417 ppm    Temperature: 25.42 °C    Humidity: 45.59 %RH