I want to use an Attiny85 to control a cpu fan with PWM, and activate a buzzer if overheat.
So I would need 2 different frequencies.
One Fast PWM about 20 Khz for the fan, and a low frequency about 3.3 KHz for the buffer.
Is it possible to have 2 PWM with different frequencies ?
I tried to read the doc, and find information, but I can' find anything about this.
And I'm too lame to understand the doc 
Thanks.
Does your fan misbehave somehow at 3.3kHz frequency?
No, but just noisy.
How about tone() for the buzzer?
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Why didn't I think about it ?
tone() works perfectly ...
Thanks a lot !
The worst thing is I'm not a total beginner witj Arduino ... Stupid