Temperature Switch Via Sender

[ATOYOTA]

http://www.autospeed...isplay&A=112617

 

i use this

 

works amazingly

Yeah, that's pretty much bang on what I'm after. That's if it can be wired up to an existing sender.

[B.L.Z.BUB]

Any answer on the sensor issue? Anyone?

[ATOYOTA]

How does the standard sender work anyway? Is the needle on the temp. gauge dictated by current flow or something? It might be possible to wire up a relay and dial to the existing hardware.

 

EDIT: Just read up on temperature senders. They basically act like a resistor: the higher the temperature, the less resistance and more current flow; thus raising the needle on the gauge. I think I can nut this out and figure out a way of hooking up a relay.

Edited July 18, 2013 by ATOYOTA

[ATOYOTA]

So I've read up a little on the basics of electronic circuits and I think I'm onto something.

The sender sends a variable current depending what temperature it sits at. That then goes through the dial which can adjust how much of that variable current comes out the other end. Then what I was trying to do is find a way of building up enough current to trigger the transistor into dumping the current once it reaches a certain point (12V for example, but I doubt the sender alone would have that much flowing through it); I didn't want the dial to just trickle current straight to the fan. The resistor is so that the transistor isn't just bypassed completely (again, unsure of the level of resistance required). Finally, the current (12V, 2V, whatever the nominated voltage) is sent to the ignition point on the fan relay.

 

How's that sound?? Is there something I'm missing, like an amplifier or something to bring the current up to a usable level?

Edited July 19, 2013 by ATOYOTA

[ATOYOTA]

Surely there's SOME electrosexuals on here who can help me...

[It's_AUDM_Yo]

Surely there's SOME electrosexuals on here who can help me...

 

Never noticed this dude, I guess i'm pretty good with this stuff.

 

Yeah your general idea is correct. As a generalisation the few temp gauges if fiddle with operate on about 0-5v.

I doubt the factory sensor will work with it. The main issue will be to find out what sensor you will work with that "magic box"

As far as I can tell you can just go straight from the box to your fan/relay.