PWM duty-cycle has been divided in 6 steps moving from the slowest to the fastest speed pushing the button.

When you've set the right speed press and hold the switch untill the red led flashes, then the system will save the

eeprom data so the next time you'll turn on the module it will start at the saved speed. 

Download gerber

Download sourcecode

fan ctrl sch

fan ctrl brd

FAN-CTRL

FAN-CTRL bottom

fan ctrl 00