#24 Controlling a Fan by Measuring its Speed and Supplying a PWM Signal

This video shows how to use Arduino interrupts to measure the speed of a strong 4 wire fan. It shows also the steering of the RPMs by using a PWM signal. And it measures the transfer function of the fan.

The fan is part of my Wind Tunnel Project.

In the next video I will close the loop with a PI controller programmed into the Arduino to stabilize automatically a choosen RPM.

Useful Links:

12V Power Supply: http://www.aliexpress.com/snapshot/6926985954.html?orderId=69411270605264

TimerOne library: https://www.pjrc.com/teensy/td_libs_TimerOne.html

Example sketch (experimental): https://github.com/SensorsIot/Controlling-a-fan

Arduino to Excel Transfer: https://youtu.be/AgJegJ30Pj4 ... https://www.youtube.com/watch?v=FEt4zB6f0v8