This is a web enabled PM2.5 monitor. It was designed to be cheap and easy to build. It uses a Photon as the microcontroller and a shinyei PPD42 air sensor. The full instructions and research can be found at https://airquality406.wordpress.com/Step 1: Setup the Photon on your WiFi.
In this step you will get the photon connected to your wifi and communicating with the cloud.Step 2: Putting the Code on your Photon
This step shows you how to put the operating code on your photon.Step 3: Build your Air Sensor
This shows all the steps required to build the air sensor.Step 4: Modifying and Reading the Code
If you are interested in changing the code.