computer control relays all out of wack

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norcalcreations

Member - Posts: 18

Joined: December 05, 2004

Location: United States

Posted: April 10, 2005 at 7:03 PM / IP Logged

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.

If you think you know everything you will learn nothing

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ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: April 13, 2005 at 9:17 AM / IP Logged

Knowing specifics on wiring and components would probably be a help

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usmiv4o

Member - Posts: 6

Joined: April 24, 2005

Location: Bulgaria

Posted: April 26, 2005 at 4:37 PM / IP Logged

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

:)

I worship his shadow...

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computer control relays all out of wack

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