ESP8266 and Plantower AQ sensor
This project is an ESP8266 combined with an AQ sensor and temp / humidity sensor. I have these set up around my house so I can monitor air quality and temp. It broadcasts the sensor information over UDP, and anything listening for the UDP broadcasts can decode the information and use it.
Here is a photo of the completed project:
The sensor gets power over USB. When you power the sensor up, it will create an ad-hoc wifi network. You can connect to that network then configure the sensor with the network you want it to connect to.