Technical notes
Sensor inputs
The circuit illustration includes temperature, humidity and distance sensing around an Arduino Uno. These inputs describe different aspects of the local environment and should have clearly defined roles in a control application.
Local OLED feedback
An OLED display is shown in the same arrangement. A local view gives the system a place to present readings or operating information alongside the sensor connections.
Control study scope
This is a design study for sensor informed fan control. The sensing arrangement provides a foundation for discussing the intended response before a complete fan driver and operating strategy are settled.