If it's like a computer fan,
an "electronic fan" or something, there's some variability, but not 1-99% (not nearly).
That isn't really correct. It might work ok in this project, but in principal the 10K should be pulling down the PWM pin, not the MOSFET gate. As drawn, the 10K and 220R form a voltage divider which reduces the voltage at the MOSFET gate. That could cause it's Rds On to be higher than it could be and drop a higher voltage and have a higher power dissipation. At best, this will only make it slightly less efficient, but in the worst-case-scenario could cause it to overheat and fail.
What could you do against it? I dont want my room to burn up in flames lol
Yeah i know. It mostly, the fans will spin above 50% of they are on, sooo.. xd. But thanks for pointing it out
It won't
ok, hello its me again... I have one last question. I just checked, how i will connect everything and I seem to have not enough PWM pins for every fan. Is it possible to connect like two fans in Serial? or whats probably better in parallel? I cant see why this wouldn´t work. The diode has enough amperes and the transistor definetly xd. This will be the last question of mine to this topic..
Famous last words but thats OK.
Must be in parallel, series will not work
Which Arduino are you using?
Nano. But i plan to put in some buttons and a display lol. Everything fits in perfectly. And do does the 2. fan also need a new diode or will the first one fullfill its purpose?
Only one diode is needed, even if you have two fans in parallel
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