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Possible to get a VSS to trigger a relay?


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boost n juice 
Member - Posts: 17
Member spacespace
Joined: February 14, 2005
Location: United States
Posted: September 15, 2005 at 3:44 PM / IP Logged  

Bottom line, I'm looking to power a device at 35MPH or faster...

Wondering if there was a module or something that can read a VSS pulse range to effectively turn on a relay at 35mph, but shut it off if it goes below 35MPH...

I know there are several head units that you tap into the VSS so the tech is there, just hoping this "vss reading module" isn't expensive or extremely labor intensive...

Thanks!

sneakycyber 
Silver - Posts: 413
Silver spacespace
Joined: September 13, 2005
Location: United States
Posted: September 16, 2005 at 4:16 PM / IP Logged  
Hrmm thats a damn good question, anyone know the answer? I will be looking for it tonight
sneakycyber 
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Silver spacespace
Joined: September 13, 2005
Location: United States
Posted: September 16, 2005 at 4:18 PM / IP Logged  

What vehicle are you working on?

exdox77 
Member - Posts: 35
Member spacespace
Joined: May 31, 2005
Location: United States
Posted: September 16, 2005 at 4:49 PM / IP Logged  
you could find a volt sensitive device that would monitor the voltage that comes from the VSS sensor and at 35mph. then you can set it to turn on an output to a relay thought would turn on whatever you want to turn on, if you really want to get technical you could build circuit that could do this!
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boost n juice 
Member - Posts: 17
Member spacespace
Joined: February 14, 2005
Location: United States
Posted: September 20, 2005 at 2:28 PM / IP Logged  
Dodge Neon SRT-4...
redpeppers 
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Silver spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: May 24, 2005
Location: United States
Posted: September 21, 2005 at 1:07 AM / IP Logged  
most VSS wires are in AC voltage.......u would prolly ahve to build your own circuit to see a high enough voltage to trigger a transitor and not a realy.....
Where theres is a wire there's a way.
floaterr 
Silver - Posts: 383
Silver spacespace
Joined: December 07, 2002
Location: United States
Posted: September 26, 2005 at 4:09 PM / IP Logged  
Just a thought.. You might search the internet for parts for one of those moving wing kits. I know they also have a unit that will lower your tailgate on your pickup at a certain speed.
Here's a link the website http://droptail.com/spoiler.htm. You might be able to buy the electronics and activate a relay as opposed to the actuator. Says it activates at 40mph.
next thought would be if its a standard tranny you could install micro switches on the shift linkage. Like in 2nd gear and 3rd gear. Shifting into 3rd would turn the relay on, shift down into 2nd would turn it off. (momentarty relay drawing are on this site).
KPierson 
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Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: September 27, 2005 at 3:59 AM / IP Logged  
I built a module a few months back that was designed to be an RPM switch.  It works based on a square wave input, and is programmable to basically any setpoint.  It CAN be done, and it CAN be done rather cheaply.
Kevin Pierson

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