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electrical engineer needed


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liinstaller 
Member - Posts: 25
Member spacespace
Joined: June 02, 2004
Location: New York, United States
Posted: December 25, 2004 at 5:57 PM / IP Logged  

Here's what I need, a fan speed controller operated either by an up and down switch or by four seperate switches(off,low,med,high). I can do it usuing relays and four switches but it will not have a memory. I need it to return to its last state when I turn the ign. back on. If anyone knows of any controllers that will work or if anyone wants to make some money and build one it would be greatly appreciated.

Thanks,

Tom

liinstaller 
Member - Posts: 25
Member spacespace
Joined: June 02, 2004
Location: New York, United States
Posted: December 25, 2004 at 6:00 PM / IP Logged  

almost forgot, I only need three speeds and an off position. also I would need to use momentary push button switches which I have already.

Thanks Again,

Tom

hotwaterwizard 
Silver - Posts: 1,350
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Joined: December 11, 2003
Location: California, United States
Posted: December 30, 2004 at 12:21 AM / IP Logged  

Not enough Details.

How can you do it with Relays?

Do you have a Drawing?

How do you want it to switch?

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
mobilevt 
Copper - Posts: 73
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Joined: October 29, 2003
Location: Washington, United States
Posted: December 30, 2004 at 3:10 AM / IP Logged  

Yeah, I just might have the solution for you but I'd need more info.  What kind of switch would you be willing to work with, etc?

Sean

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hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: December 30, 2004 at 8:53 AM / IP Logged  

electrical engineer needed -- posted image.

How about a Rotery Switch?

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
french town 
Member - Posts: 4
Member spacespace
Joined: December 27, 2004
Location: United States
Posted: December 30, 2004 at 11:30 AM / IP Logged  

Rheostat, rated at the watts/ amps needed.

xetmes 
Silver - Posts: 586
Silver spacespace
Joined: May 18, 2003
Posted: December 30, 2004 at 12:06 PM / IP Logged  
how do you want to control the speed? resistance? PWM?...
liinstaller 
Member - Posts: 25
Member spacespace
Joined: June 02, 2004
Location: New York, United States
Posted: December 30, 2004 at 9:12 PM / IP Logged  
I already have a rotory switch but want an electronic switcher. I would like to use momentary push buttons to control which speed the blower motor will be on. Current rating is not a big deal because I can just run the outputs to relays.Four switches, Off, Low, Med, High. Pressing the off button will turn off outputs, pressing the low button will will give an output(+or - doesn't matter) on one of three output wires(low output), pressing the Med button will turn off either low or high outputs and turn on med output, pressing the high button will turn off either low or med outputs and turn on high output. But if the ignition is turned off when any of the three speeds are on, I need it to return to the same speed automaticlly when the ignition is turned back on. I have the original resitors to determine the speed. I just need this controller to supply 12V to the resistors depending on what speed is selected.
Captanham 
Silver - Posts: 365
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Joined: December 18, 2004
Location: United States
Posted: January 02, 2005 at 11:38 AM / IP Logged  
you can use a PiC to do this, programable integrated circute, i don't have a chip burner anymore or i would, find someone with a chip burner and it's a simple flow chart.. it would be really easy
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liinstaller 
Member - Posts: 25
Member spacespace
Joined: June 02, 2004
Location: New York, United States
Posted: January 02, 2005 at 8:27 PM / IP Logged  
Thanks for the info Captanham. If anyone out there can do this for me let me know how much you want.
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