For the physical computing, I used a Particle Photon, 3 LED, and a small fan for diffusing the smell. It's my first time using Particle Photon, and it took time to figure out the Internet communication part. I also wrote a bit code to make the 3 LEDs lighting up with different paces, so it feels it is running from left to right. The light up process is using AnalogWirite, so it's smoother.
The interesting part of the particle code is that it's constantly listening to a web server command, once it receives a "on" command, it starts to work, otherwise stop working.
Is this a good/useful/informative piece of content to include in the project? Have your say!