Adding LEDs to alarm output

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vibe03

Member - Posts: 27

Joined: December 12, 2005

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Posted: December 12, 2005 at 12:24 PM / IP Logged

How do I add more LEDs to my alarm's output? I tried to connect a relay but was unsuccessful. I have a black widow alarm.

art

auex

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Posted: December 12, 2005 at 12:26 PM / IP Logged

Wire them in series.

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vibe03

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Joined: December 12, 2005

Location: United States

Posted: December 12, 2005 at 12:29 PM / IP Logged

That would cause them to be dim. (right?) I want them to max out.

art

vibe03

Member - Posts: 27

Joined: December 12, 2005

Location: United States

Posted: December 12, 2005 at 12:34 PM / IP Logged

I was going for 6 LEDs. Is there any thing that I can do so that I can use all 6? Thanx for all the help.

art

vibe03

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Location: United States

Posted: December 12, 2005 at 12:45 PM / IP Logged

One might think that is over kill, but I am just tinkering with different things. If you make any mod to a car it is advertisment for a thief.

art

auex

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Joined: December 23, 2002

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Posted: December 12, 2005 at 1:29 PM / IP Logged

Get the DEI LED sequencer. 5 led ports with up to 5 led's per port, wired in series of course.

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.

vibe03

Member - Posts: 27

Joined: December 12, 2005

Location: United States

Posted: December 12, 2005 at 4:07 PM / IP Logged

Thanx 4 all the help... I should be able to get this going now.

art

vibe03

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Joined: December 12, 2005

Location: United States

Posted: December 13, 2005 at 6:38 PM / IP Logged

Are these 2 schemactics the same?

Adding LEDs to alarm output -- posted image.

art

vibe03

Member - Posts: 27

Joined: December 12, 2005

Location: United States

Posted: December 13, 2005 at 6:48 PM / IP Logged

Only the first LED lights up. Tested all resistors and LEDs, they are good. I would appreciate any help that can be provided.

art

KPierson

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Posted: December 13, 2005 at 8:33 PM / IP Logged

The two schematics posted are not identical. The one on the left has all the LEDs wire in parallel, with individual current limiting resistors. This should work fine, depending on how you are driving them

The second schematic shows all the resistors wires in series. In a series setup like shown all the LEDs will have the same amount of current, but the voltage would be extremely low - battery voltage divided by number of LEDs - this assumes all resistors are the same value, if they are differnt values you'll create a voltage divider and your voltage output of each node will be different.

Kevin Pierson

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