What is it?

Introducing the OpenCO2 Mini Sensor, an ultra compact and powerful indoor air quality monitor designed for health, comfort, and convenience. Measuring just 2 x 2.7 cm, this tiny device packs cutting-edge technology into a sleek, clear 3D-printed case that’s perfect for attaching to your keychain or slipping into your pocket. Stay informed about your environment wherever you go!

Key Features:

• Advanced Sensing Technology: Equipped with the brand-new Sensirion STCC4 CO2 sensor (±100 ppm accuracy) and SHT40 temperature/humidity sensor (typical temperature accuracy of ±0.2°C), delivering precise and reliable air quality measurements.
• Dual Connectivity: Seamlessly connect via Bluetooth Low Energy (BLE) to the Sensirion MyAmbience app (available on iOS) for real-time data visualization, graphs, and historical data access. Alternatively, integrate with Home Assistant or other smart home platforms over WiFi for advanced automation and monitoring.
• Vivid RGB LED: A RGB LED provides instant visual feedback on CO2 levels, glowing green, yellow, red or magenta to indicate air quality status at a glance.
• Portable and Durable Design: Encased in a clear 3D-printed enclosure, the OpenCO2 Mini Sensor is lightweight, durable, and stylish. Its compact size and keychain compatibility make it ideal for home, office, or on-the-go use.
• USB-C Power: Powered via a modern USB-C port to your smartphone or other power outlets for easy and continuous operation, ensuring you’re always ready to monitor your air quality.

Why Choose the OpenCO2 Mini Sensor?

Poor indoor air quality can impact health, productivity, and well-being. The OpenCO2 Mini Sensor empowers you to take control by providing accurate, real-time insights into CO2, temperature, and humidity levels. Whether you’re optimizing ventilation at home, monitoring air quality in a classroom, or ensuring a healthy workspace, this device is your perfect companion.

• High Accuracy: The Sensirion STCC4 and SHT40 sensors ensure professional-grade precision, rivaling commercial monitors at a fraction of the cost.
• Smart Integration: Connect to the Sensirion MyAmbience app for intuitive mobile monitoring or integrate with Home Assistant for custom automations, such as triggering ventilation systems when CO2 levels rise.
• Portable Convenience: Its ultra-compact size and keychain-ready design make it easy to carry anywhere, from your home to a hotel room or office.
• Open-Source Flexibility: Built on the ESP32-S3 platform, the OpenCO2 Mini Sensor supports open-source firmware, allowing tech enthusiasts to customize and expand functionality.

Technical Specifications:

• Microcontroller: ESP32-S3 with integrated WiFi and BLE
• Sensors:
• Sensirion STCC4 CO2 sensor (±100 ppm accuracy)
• Sensirion SHT40 temperature/humidity sensor (±0.2°C temperature accuracy, ±1.8% RH accuracy)
• Connectivity: Bluetooth Low Energy (BLE) and WiFi
• LED: RGB for real-time air quality indication
• Power: USB-C male
• Dimensions: 2 x 2.7 cm
• Case: Clear 3D-printed, keychain-compatible
• Compatibility: Sensirion MyAmbience app for iOS and Android, Home Assistant, and other smart home platforms

What’s Included:

• OpenCO2 Mini Sensor
• Clear 3D-printed case with keychain attachment
• Quick-start guide pdf

Why It Matters:

Regular ventilation is key to maintaining healthy indoor air quality. The OpenCO2 Mini Sensor provides a simple, affordable, and portable solution to monitor CO2 levels, helping you make informed decisions to improve your environment. Whether you’re a health-conscious individual, a DIY enthusiast, or a smart home integrator, this sensor delivers professional-grade performance in a pocket-sized package.

Order your OpenCO2 Mini Sensor today and breathe easier knowing you’re in control of your air quality! Available exclusively on Tindie for now.

Designed and assembled by OpenCO2 in Germany.