what kind of relay do I need?

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casnj

Member - Posts: 17

Joined: May 27, 2004

Posted: June 07, 2004 at 12:06 PM / IP Logged

what kind of relay do I need for this and how do I wire it?

i have two wires one that goes positive and the other is 0 when the door is locked. then they both go to positive at unlock. well if the 1st condition exist I want the positive voltage to flow to my device.

markcars

Silver - Posts: 662

Joined: December 11, 2002

Location: New York, United States

Posted: June 07, 2004 at 3:54 PM / IP Logged

I don't know what exactly you're wanting but I you can accomplish any switching requirement with a spdt relay. If there is 2 simultaneous switching that you need the go for a dpdt relay or 2 spsts will do too.

casnj

Member - Posts: 17

Joined: May 27, 2004

Posted: June 07, 2004 at 5:23 PM / IP Logged

markcars wrote:

what i want to do is simple. im just not explaining it fully :)

i have two wires.

one is positive and one is negative during lock

both are positive during lock

when the 1st condition exist I want the power to go to a pin

when the 2nd condition exist i want te power to go to another pin

I need the 1st condition. the 2nd is optional

CHaseHeadrick

Member - Posts: 34

Joined: May 05, 2004

Location: United States

Posted: June 08, 2004 at 10:51 PM / IP Logged

i don't understand how they can both be positive during lock, or at unlock? if they rest a ground, then when one wire changes to 12v+ it is the function (lock/unlock) wire. if they rest at 12+, then its the same way, the wire that stays at 12v+ is the function wire.

93 4RUnner

Alpine H/U

Alpine Mids/Highs

Alpine Security w/DEI remote

start and window control

Rockford Lows.

markcars

Silver - Posts: 662

Joined: December 11, 2002

Location: New York, United States

Posted: June 09, 2004 at 4:49 PM / IP Logged

You could use a single pole double throw relay(SPDT) available at any electronics stores. Even Radio Shack has them if you don't have it already.

Connect pin 85 to ground (-ve)

pin 86 to the wire that gives +ve at lock

pin 30 to a constant +ve

pin 87a to the wire that you want power during lock

pin 87 to the wire you want power during unlock

casnj

Member - Posts: 17

Joined: May 27, 2004

Posted: June 10, 2004 at 7:56 AM / IP Logged

so pin 85 is connected to the wire that shows ground when locking right? pin 85 is not a chasis ground?

casnj

Member - Posts: 17

Joined: May 27, 2004

Posted: June 10, 2004 at 8:46 AM / IP Logged

also will this relay work

http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F002%5F013%5F000&product%5fid=275%2D240

markcars

Silver - Posts: 662

Joined: December 11, 2002

Location: New York, United States

Posted: June 10, 2004 at 4:10 PM / IP Logged

casnj wrote:

so pin 85 is connected to the wire that shows ground when locking right? pin 85 is not a chasis ground?

Pin 85 goes to direct chassis ground.

markcars

Silver - Posts: 662

Joined: December 11, 2002

Location: New York, United States

Posted: June 10, 2004 at 4:18 PM / IP Logged

casnj wrote:

also will this relay work

http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F002%5F013%5F000&product%5fid=275%2D240

This won't work, and if it does it will burn out! Get yourself a BOSCH automotive relay or a similar one. They're for autos and can handle the high amperage if you need it, plus they get energized by 12v. The one on this link is a 5 Volt so I'd say don't get this.

At the Shack, the part number is

30A Automotive Relay

Catalog # 275-226

If you just walk by to a Radio Shack nearby where you live, you can just pick one up from their parts section. They're in a tray marked "Automotive Relays" or "Relays"

casnj

Member - Posts: 17

Joined: May 27, 2004

Posted: June 10, 2004 at 6:49 PM / IP Logged

this wont work then.

wire 1 is positive at lock and wire 2 is negative

wire 1 is positive at unlock and wire 2 is positive

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