https://github.com/snakeye/co2-sensor

Compact MH-z19b based CO2 sensor device
https://github.com/snakeye/co2-sensor

co2-sensor esp8266 esp8266-arduino mh-z19 mqtt

Last synced: 6 months ago
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Compact MH-z19b based CO2 sensor device

• Host: GitHub
• URL: https://github.com/snakeye/co2-sensor
• Owner: snakeye
• License: mit
• Created: 2018-10-21T17:21:13.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2025-04-14T10:28:18.000Z (6 months ago)
• Last Synced: 2025-04-14T11:35:52.768Z (6 months ago)
• Topics: co2-sensor, esp8266, esp8266-arduino, mh-z19, mqtt
• Language: HTML
• Homepage:
• Size: 556 KB
• Stars: 7
• Watchers: 3
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Carbon Dioxide Sensor MH-Z19b - ESP8266 Prototype

This project utilizes the MH-Z19b carbon dioxide sensor module, which provides a simple and cost-effective way to measure CO2 concentration via UART interface. The sensor measures concentrations in the range of 0-5000ppm, making it suitable for various environmental monitoring applications.

The device is built using the ESP12e module and features an RGB LED to indicate CO2 concentration levels.

![CO2 Sensor](images/co2-sensor.jpg)

## Features

- **CO2 concentration measurement** from 400ppm to 5000ppm using the MH-Z19b sensor.

- **RGB LED indication** with different light modes based on CO2 levels.

  

### LED Modes:

- **Steady Green Light**: CO2 concentration in the range of 400-1000ppm (normal levels).

- **Breathing Light**: Color changes from green to orange as CO2 levels increase from 1000 to 1500ppm.

- **Fast Breathing Light**: Color changes from orange to red as CO2 levels increase from 1500 to 2000ppm.

- **Fast Blinking Red Light**: CO2 concentration exceeds 2000ppm (dangerous levels).

- **Steady Blue Light**: Indicates that an OTA (Over-the-Air) update is in progress.

## Firmware

The firmware for the device is written using **PlatformIO** and the **Arduino** platform. The software controls the sensor, processes the data, and adjusts the LED indications based on the CO2 concentration.

## License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.