This Amazon Alexa skill enables you to control (not just switching on/off) all your IR devices like TV, AC, set-top box, music systems, etc.
I hate looking where is the remote controller or grab my phone to control my TV or other IR devices. Alexa and hacking saved my day!
Talking to Alexa will trigger a Particle.io API call which will trigger a IR LED to send control codes to your TV.
This is a line following robot with vaccum cleaning capabilities. This project explains how to build it using Arduino and also NodeMCU.
Control your air conditioner from everywhere with an app and ST Nucleo board.