[TriEmbed] laptop fan motor control question

[Brian]

On 2/2/21 5:14 PM, Pete Soper via TriEmbed wrote:
> Thanks, guys. The connections were red for positive, blue for ground and 
> brown for what I assume is the PWM input. 

That third wire is almost certainly[1] a tachometer OUTPUT, not an 
input.  It's there so that the motherboard can monitor fan speed. 
Modulating the speed would be accomplished by one of the several methods 
that other folks've mentioned.

-B

[1] - unless, ya know, it isn't.  :)