Controlling fan speed with a Ras Pi?

[Cheyenne Deal]

I am working on a project that I am trying to find a way to create a fan speed controller that is run by a Raspberry Pi. I am currently using a manual variable speed controller but was unable to find anything that would do what I am looking for. Would anyone have any suggestions?

[Stephen Beck]

I know this is not helpful, but when you say "manual variable speed controller" are you referring to something along the lines of a rheostat?

What kind of fan motor are you using?

Steve

On Aug 30, 2015 10:29 PM, "Cheyenne Deal" <deal.c...@gmail.com> wrote:

I am working on a project that I am trying to find a way to create a fan speed controller that is run by a Raspberry Pi. I am currently using a manual variable speed controller but was unable to find anything that would do what I am looking for. Would anyone have any suggestions?

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[Cheyenne Deal]

I am currently using a 120v blower fan with a manual fan control (Almost Identical http://www.ebay.com/itm/Variable-Fan-Speed-Controller-Control-Exhaust-Inline-Dimmable-Air-Speedster-/231641593467)

[David Knaack]

How robust of a solution are you looking for? 

The simple way is to pull the knob off the speed controller and connect the shaft to a servo driven by the Raspi.

The more robust (no moving parts) way would be to disassemble the speed controller and replace the analog pot with a digital pot and then drive that with the Raspi.

[Stephen Beck]

Are you wanting to make something that gets feedback from a sensor on the fan or are you just wanting to make something that will take an input electronically instead of turning the knob?

Steve