We spend over 90% of our time indoors, where the amount of CO2 we exhale has a significant impact on our health and well-being. High CO2 concentrations not only lead to tiredness, headaches and can cause dizziness, they are also a good indicator of when the distribution of aerosols in the air exceeds a value that is more conducive to the spread of coronaviruses or mycobacterium tuberculosis. Ventilation and the resulting low CO2 concentration in the air reduces the risk of infection.

Exposure to a high CO2 concentration can produce a variety of health effects. These may include headaches, dizziness, restlessness, a tingling or pins or needles feeling, difficulty breathing, sweating, tiredness, increased heart rate, elevated blood pressure, coma, asphyxia, and convulsions.

What is it?

The Mini CO2 Temp Humi Pressure WiFi Sensor is a versatile and compact device that allows you to easily monitor a wide range of environmental factors in your home, office, or other indoor space. With its advanced sensing capabilities, this sensor can measure carbon dioxide (CO2) levels, temperature, humidity, and atmospheric pressure, providing you with valuable insights into the quality of the air in your environment.

One of the key features of this sensor is its built-in WiFi connectivity, which allows you to easily connect the device to your home network and monitor your data in real-time using a variety of different devices, including smartphones, tablets, and computers. With the help of its accompanying app, you can easily set up custom alerts and notifications based on your preferred thresholds, ensuring that you always stay informed about the conditions in your indoor environment.

Despite its advanced features, the Mini CO2 Temp Humi Pressure WiFi Sensor is incredibly easy to use. The device comes pre-calibrated, so you can start using it right out of the box, and it features a simple and intuitive user interface that makes it easy to access your data and customize your settings. Additionally, the sensor is highly reliable and accurate, thanks to its high-quality sensing components and precision circuitry.

Another great feature of this sensor is its compact size. The device is small enough to be placed in a variety of different locations, including on shelves, desks, and countertops.

Overall, the Mini CO2 Temp Humi Pressure WiFi Sensor is a powerful and versatile device that is ideal for anyone who wants to easily monitor the air quality in their indoor environment. With its advanced features, intuitive user interface, and compact size, this sensor is sure to provide you with years of reliable and informative data that can help you optimize your indoor environment for maximum comfort and productivity.

This is a smaller version of a similar board with CO2 Senseair S8 Sensor that is also available in my tindie store https://www.tindie.com/products/26085/ it is smaller because of the SCD4x sensor which has a smaller size.

Features:

• SCD40 Sensor (carbon dioxide gas sensor)
• Optional Temperature / Humidity / Barometric Air Pressure sensor
• Optional 0.66 inch OLED Display
• ESP8285 Wifi Chip that serves the sensor data directly to a HomeAssistant, MQTT, HTTP, no additional gateway needed.
• CH340 USB to UART chip for flashing and programming
• 4 Buttons: 1 Mode (set flashing/programming mode), Reset, IO_5 and IO_14 are free programmable i.e. for sensor calibration or turn on/off the indicator LED
• TeHyBug Universal sensor connector to extend the device with more sensors, like temperature, humidity, barometric air pressure, UV Light, or Luminance
• WS2812B indicator LED, controlled with IO_12, for indicating the Air Quality i.e. green=good, yellow=acceptable, red=bad
• 4Pin Audio Jack connector to extend the board with additional TeHyBug Universal sensors

CO2 Sensor Specs:

• Integrated temperature and humidity sensor
• Measurement range: 400 ppm – 2000 ppm
• Accuracy: ±(50 ppm + 5 % of reading)
• Fully calibrated and linearized

What do you get?

You will get a ready-to-use, fully assembled device, with pre-flashed TeHyBug firmware. You can flash any firmware you want to it i.e. EspHome, EspEasy. Click the source code link below for more details on the pre-flashed TeHyBug firmware.

How to flash?

It is easy to flash the module since it has an USBtoUart chip on board. You can use Arduino, Platformio, EspHome, or other tools to upload your firmware to the board. Push the Mode button, hit the Reset button, and release the Mode button to put the ESP8285 Module into the flashing mode.

Example of HomeAssistant integration

The HomeAssistant support is included in the preinstalled software

A similar device with the same features but a different sensor is available in my Tindie store: https://www.tindie.com/products/26085/

Please also check my store for other smart home devices.