electrical engineer needed
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=46005
Printed Date: May 02, 2024 at 9:16 PM
Topic: electrical engineer needed
Posted By: liinstaller
Subject: electrical engineer needed
Date Posted: December 25, 2004 at 5:57 PM
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
Replies:
Posted By: liinstaller
Date Posted: December 25, 2004 at 6:00 PM
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
Posted By: hotwaterwizard
Date Posted: December 30, 2004 at 12:21 AM
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 !
Posted By: mobilevt
Date Posted: December 30, 2004 at 3:10 AM
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 ------------- Emergency Vehicle Technician
Got Freedom? Thank a vet!
Posted By: hotwaterwizard
Date Posted: December 30, 2004 at 8:53 AM
How about a Rotery Switch? ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: french town
Date Posted: December 30, 2004 at 11:30 AM
Rheostat, rated at the watts/ amps needed.
Posted By: xetmes
Date Posted: December 30, 2004 at 12:06 PM
how do you want to control the speed? resistance? PWM?...
Posted By: liinstaller
Date Posted: December 30, 2004 at 9:12 PM
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.
Posted By: Captanham
Date Posted: January 02, 2005 at 11:38 AM
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 ------------- Bad Boys Customs
audio - video - security
If you use it. Suport it. Donate to the 12 volt!
Posted By: liinstaller
Date Posted: January 02, 2005 at 8:27 PM
Thanks for the info Captanham. If anyone out there can do this for me let me know how much you want.
Posted By: hotwaterwizard
Date Posted: January 02, 2005 at 10:57 PM
Look at this post! Close to the same as yours. https://www.the12volt.com/installbay/forum_posts.asp?tid=40671&PN=1&tpn=2 
Just use a push switch instead of a clock pulse. ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: liinstaller
Date Posted: January 03, 2005 at 8:59 PM
Good info. I can just use an up switch and down switch. Did you ever figure out how to make it go back down?If I remove power will it retain memory? If not I can wire my relays using ignition but how much current draw on that circuit? Thanks for the help and keep the ideas coming.
Posted By: xetmes
Date Posted: January 03, 2005 at 10:00 PM
I would probably just use a microcontroller to save the hassle (like a PIC) but that requires the hardware... I could burn a PIC if you want and if i get the time to do so (low on free time lately)
Posted By: liinstaller
Date Posted: January 04, 2005 at 5:58 PM
Yeah thats what Captnham was saying. If you could do that that would be great. There's no rush on this so whenever you get around to it is fine. I'll deffinately compensate you. Just let me know how much. Thanks for the help.
Posted By: Captanham
Date Posted: January 04, 2005 at 11:15 PM
that other bored posted above reminded me of that, there is another chip ment for digital clocks, it's like a pulse counter, you could use that, altho i think it puts out binary, i'm not really sure, but it might work for ya, look something like that up in mouser or something,, or maybe i'll look at get back to ya ------------- Bad Boys Customs
audio - video - security
If you use it. Suport it. Donate to the 12 volt!
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