flashing led
Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=66387
Printed Date: April 27, 2024 at 10:38 AM
Topic: flashing led
Posted By: icemanvts
Subject: flashing led
Date Posted: November 16, 2005 at 3:19 PM
hi everyone i bought a flashing blue/red led! i want to wire it up as a fake alarm flashing led i would like it to come on when the ignition is off and turn off when the ignition is on...? any info would be apreciated greatly..cheers
Replies:
Posted By: kirktcashalini
Date Posted: November 21, 2005 at 2:20 PM
hit it up with a relay, you probably should go to the relay forum, you will only need a little relay due to how little power a LED uses. you basically want to get it so the remote 12v+ is reversed, so when your car is ON it is off, and when your car is off, it is on. should be doable with very little amounts of wiring.
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99 Blazer LT. Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)
Posted By: rablair
Date Posted: December 12, 2005 at 8:40 PM
You don't need a relay.
Wire the positive side of the LED to a constant (battery) 12V source. Wire the negative side of the LED to an ignition 12V source that is on only when the ignition is on.
That way your LED will only see a 12V difference across its wires when the ignition is off. When the ignition is on, both wires will have 12V and so the LED will see zero V.
Posted By: cowboy21
Date Posted: December 15, 2005 at 4:28 AM
does that way work? does the starter provide a ground when off? have u tested this? ------------- modest yet effective... ECLIPSE 12", Venom 8"x2, Focal 5 1/2" comp.,Response amps x2 (580WRMS total @ 4Ohms), Pioneer TFT + DVD, good for 148.7dB
Posted By: borgreu
Date Posted: December 16, 2005 at 4:39 AM
technically it works but i doubt when you wire it anyways you could always leave it on even when on.... and avoid all the work and components
Posted By: cowboy21
Date Posted: December 16, 2005 at 5:03 AM
leaving it on would be bad when driving at night
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modest yet effective... ECLIPSE 12", Venom 8"x2, Focal 5 1/2" comp.,Response amps x2 (580WRMS total @ 4Ohms), Pioneer TFT + DVD, good for 148.7dB
Posted By: total_overkill
Date Posted: January 13, 2006 at 1:51 AM
Just wire it off your deck. Just like it turns an amp on when it is powered. ------------- 40 grit has saved my life sometimes =[
Posted By: kirktcashalini
Date Posted: January 13, 2006 at 7:08 PM
i dont think the guy who said all that is making any sence. he said put the positive leg to the battery, clearly its going to atleast need a resistor. i still think a relay is the easiest way to make a reverse remote+ basically.
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99 Blazer LT. Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)
Posted By: total_overkill
Date Posted: January 14, 2006 at 12:31 AM
oops my bad you want it to come on when ignition off. Get a cheap alarm system (some are really really cheap but still do the job) or if you have one go to wiring diagram and get the NEg pulse or not ect but if you RTFM Read The F&*cking Manual No this is not directed at you but my own private joke called RTFM, It usually will explain alot of the more advanced options. I suggest talking to the guys in the car alarm forums for exact make and model of your car alarm or possible car alarm. A car alarm is always a good idea and an easier way to tie in when ignition off. ------------- 40 grit has saved my life sometimes =[
Posted By: bellsracer
Date Posted: January 17, 2006 at 4:25 PM
A relay isn't hard to use. A basic spdt will do fine. Wire it up like this: 30 = 12v battery 85 = ground 86 = accessory that stays on when you turn on your car (radio is prefferred: acc turn on wire) 87 = nothing 87a = to led+ led- = ground If you want the LED to blink when it is on, I actually used a universal blinker relay from Wal-mart (2 prong type) for one project. It's about $2. put that in line between 87a and the LED and that should take care of it. A blinking LED that is on when the car is off and turns off when the car is on. Hope this helps. Ganbatte ne (good luck -or- do your best) ------------- Never send your ducks to eagle school.
The difference between ordinary and extraordinary is that little extra.
The 3Ls of life: Learn from the Past, Live for the Present, Look to the Future.
Posted By: bellsracer
Date Posted: January 17, 2006 at 4:28 PM
hehe ignore the part about adding the blinking relay. I forgot that your led is already a blinking type. >.< oh well. For those wanting to do it, but didn't get to ask... there you go ^-^ ------------- Never send your ducks to eagle school.
The difference between ordinary and extraordinary is that little extra.
The 3Ls of life: Learn from the Past, Live for the Present, Look to the Future.
Posted By: jdubsl2
Date Posted: January 24, 2006 at 2:21 AM
You can do this for under $5 at RadioShack. You need 1 470 Ohm .5W Resistor
A Blinking LED (yours being on solid would work fine, or for $1.39 get pt#276-036 from RS)
Fuse taps (optional) Wire one end to a source that is hot at all times (ie. cigerette lighter) and the other to any ignition controlled fuse (possibly radio, wipers?, etc.) (B+ constant) --- (470 Ohm .5W Resistor) ---- (LED) --- (B+ w/ KOEO) That should do it. I rigged this up on my girlfriends civic after the stereo was stolen and it works great.
Posted By: Shawn123421
Date Posted: February 06, 2006 at 2:26 PM
i just did a DIY on another forum about this, so here's the link https://https://www.7thgencivic.com/forums/showthread.php?t=245585-------------
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