“Hello!
In this short instructable i will show my very simple but yet useful gadget. I created this for the son of my friend of mine for educational purpose, for a school presentation.
This is an arduino nano based simple controller using a nokia 5110 display, BC547 NPN transistor, a 3 wire (12V) pc fan, 2 leds and a DS18B20 temperature sensor. As you can see in the picture it is a simple and basic setup.”