computer control relays all out of wack

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=53655
Printed Date: May 18, 2024 at 9:37 PM

Topic: computer control relays all out of wack

Posted By: norcalcreations
Subject: computer control relays all out of wack
Date Posted: April 10, 2005 at 7:03 PM

o.k. here is the deal, I am getting ready to install a carputer in my car. I am planning on setting it up so that I can turn on/off the sub amp, lights, and if my funds allow/I can figure it out I would like to turn on and off the rear tv's.

I get all the parts I need from my buddy, and did a trial set up and it worked great with the sub amp and lights, but when I threw a third relay in the mixed it got all messed up. the relays go haywire, and just continually turn off and on. I talked to my buddy and he had no idea.

would anyone happen to have some insight on this. any feedback would be greatly appreciated.

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If you think you know everything you will learn nothing

Replies:

Posted By: ff-mike
Date Posted: April 13, 2005 at 9:17 AM

Knowing specifics on wiring and components would probably be a help

Posted By: usmiv4o
Date Posted: April 26, 2005 at 4:37 PM

if I understand you wish to
control Lamps, Horn, Central Lock, Windows and etc with you Laptop

If this is I can Help
this is simple
you must use paralel (printer port) on PC
there are a lot of sorce code for controling
in Tupbo Pascal (Delphi):
Port(0378) = 0; (this will turn all relays off, 255 all on)
pins 2 to 9 are outputs +5 Volts 0.1 Amper
There are inputs 4 I think.
schematik is :
paralel port -> resistor (500 Ohms) -> transistor -> relay -> Lamp
:)

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I worship his shadow...