5v signal to trigger power window

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=28887
Printed Date: June 01, 2024 at 12:09 PM

Topic: 5v signal to trigger power window

Posted By: jiangq
Subject: 5v signal to trigger power window
Date Posted: March 23, 2004 at 12:53 AM

Hi, I had a 2000 Toyota Camery Solra. I try to use the parallel port of computer that send our 5v dc power. And I write a GUI to make my window go up or down. I bought a relay from Radio Shack that will trigger from the signal send out from my computer. The window will go down, but after the window go all the way down, the relay will burn and smoke come up. I also use a 3 amp diode to stop that, which only last few seconds before it burn the relay again. Does anyone know what cause the relay to burn, and is there a way to solve this problem. Thanks!

Replies:

Posted By: auex
Date Posted: March 23, 2004 at 5:52 PM

You have to have wired something way wrong. I have never smoked a relay, ever. Also have you ever heard of something called a fuse?

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Posted By: jiangq
Date Posted: March 23, 2004 at 9:01 PM

The way I connect the relay is:

posted_image

I heard of fuse but I don't know how and what will it do. Also from N.O. to the motor of the window, I put a diode in there, but it does not work. So I don't know is it the way I wire the relay that cause to smoke the relay. And how exactly does the fuse help. Thanks!

Posted By: auex
Date Posted: March 23, 2004 at 9:30 PM

The way you need to wire the relays is similiar to this diagram where as lock is roll up and unlock is roll down, you need two relays per window(1 for up and 1 for down). The fuse would have prevented you from frying the relay. You should read through ,this as well.

posted_image

Also, next time you link to an image make sure that you put the .jpg at the end of the link or you get a red X

-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

Posted By: jiangq
Date Posted: March 24, 2004 at 2:14 AM

posted_image

This is how I wire mind, and is only for window down. I am not exactly sure what is the number on your diagram mean, and is this for all relay or I need to buy a specific one, and same thing with the fuse. Thanks!

Posted By: jiangq
Date Posted: March 24, 2004 at 7:25 PM

Hi, is there a place where explain a little bite more detail on the diagram you provided, like what is the number mean, and where does each wire would go exactly. Thanks!

Posted By: its_radio_shop
Date Posted: March 24, 2004 at 8:10 PM

The numbers shown in diagram go like this -

85 and 86 = coil

30 = common

87 = N.O.

87A = N.C.

now you should be able to apply the above diagram to the relay you have.

Posted By: jiangq
Date Posted: March 24, 2004 at 8:17 PM

so I need two relays to work for the windows, are there certain type of relay I need to buy, cause the one I use only had 2 Coil, Com and N.O., what is N.C. anyway. Also what kind of fuse do I need to use is it just any 12v fuse. Thanks!

Posted By: auex
Date Posted: March 24, 2004 at 8:47 PM

You need SPDT, single pole double throw relays. For more info click on the link on the left that says relays.

-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

Posted By: its_radio_shop
Date Posted: March 24, 2004 at 8:59 PM

N.C. is normally closed

Use the relay type auex mentions. If you look around you can find a SPDT relay that requires 5 volts to switch it if needed.

Posted By: jiangq
Date Posted: March 30, 2004 at 3:34 AM

thanks, my window works. I was wondering is there away that I can make sure that my computer is protected 100% even if something when wrong that will not fry my computer.