Kniwwelino Desktop Fan

My children asked for a desktop fan to cool them when doing homework. We used a Kniwwelino and a Arctic F14 PWM fan. The cool thing about the Artic PWM fans is that you don't need any power transistor to change the fan speed. You just have to add a PWM signal to the forth pin of the cable and you are done. To have 12V for the fan I use a step-up converter that comes with a handy micro-USB connector.

Wiring
- 5V for Kniwwelino are taken from the step-up input side and connected to the batte