{"id":10430,"date":"2014-11-20T16:48:10","date_gmt":"2014-11-20T08:48:10","guid":{"rendered":"http:\/\/www.seeedstudio.com\/blog\/?p=10430"},"modified":"2014-11-20T16:48:10","modified_gmt":"2014-11-20T08:48:10","slug":"air-quality-sensor-project-built-in-linkit-one","status":"publish","type":"post","link":"https:\/\/www.seeedstudio.com\/blog\/2014\/11\/20\/air-quality-sensor-project-built-in-linkit-one\/","title":{"rendered":"AIR QUALITY SENSOR PROJECT built in LinkIt ONE"},"content":{"rendered":"
by\u00a0Charles\u00a0McClelland<\/p>\n<\/header>\n
\n

Introduction:<\/p>\n

I have always enjoyed science, engineering and computers. \u00a0I am not a professional engineer and I am very open to input and suggestions as I see this primarily as a learning opportunity for me. \u00a0Please take a look at this documentation and feel free to let me know how I might improve this project.<\/p>\n

As someone who likes to spend time outdoors, I have sometimes wondered whether the air quality \u2013 at the time and place I am \u2013 is suitable for strenuous activity. \u00a0In this regard, I am lucky as some people are sensitive to certain pollutants and need to worry about their exposure for even routine activities. \u00a0I saw in this an opportunity to pursue some \u201ccitizen science\u201d and continue to learn about how to build sensors and embrace the internet of things. \u00a0I am documenting this project with two goals in mind: 1) to engage others to critique my approach and suggest improvements and 2) to provide all the information needed to build and extend this project.<\/p>\n

Project Goals:<\/p>\n

    \n
  1. Build a sensor which can give consistent (accurate) results. \u00a0Precision will be a stretch goal as it will require calibration tools I may not be able to get access to.<\/li>\n
  2. Sense a range of different gasses based on the module selected and compute an \u201cAir Quality Index\u201d for each<\/li>\n
  3. Use a standard interface \u2013 i2c \u2013 so it can be used with different systems. \u00a0My first application will be with the\u00a0SeeedStudio LinkIt ONE\u00a0<\/a><\/li>\n
  4. Support portable operation on battery power using GPRS for data reporting.<\/li>\n
  5. Report all data to an Internet of Things Data streaming site for reporting.<\/li>\n<\/ol>\n

    Phase I \u2013 The Sensor Board<\/p>\n

    I started with the board as the sensor I wanted to use is a surface mount device and I knew that making the custom board to support it would have the longest lead times. \u00a0I have completed the rough design and have not yet sent the board out for fabrication so now would be a great time to take a look and let me know what I am missing. \u00a0Here are the major elements and their function:<\/p>\n