The module is essentially a pair of potentiometers, one oriented in the x direction and the other in the y direction. The Arduino sketch ... is equipped with a DHT11 sensor to read the room's ...

He decided to take an in-depth look at the DHT11 sensor; which you can get your hands on for under $3 if you know where to look. The four-pin device uses a 1-wire protocol. [Rajendra] discusses ...