Door Lock 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=84175
Printed Date: April 29, 2024 at 6:39 AM

Topic: Door Lock LED

Posted By: ppereira
Subject: Door Lock LED
Date Posted: October 15, 2006 at 8:35 PM

Here's what I'm trying to do: Connect bi-polar LEDs that would show red when the door is locked and green when the door is unlocked. The voltage drops to zero momentarily whenever either of the door lock/unlock switch is pressed otherwise it's 12V. Any idea how to construct a circuit to do that?

-------------
Paul

Replies:

Posted By: dias_ryan
Date Posted: October 16, 2006 at 1:23 PM

you'd need a flip flop IC. I can't think of a less logic based way to do such a thing.

probably stick an Inverter IC in front of the flip flop and the voltage to zero would change to a zero to voltage. Run the output of the inverter to the input of the flip flop chip and this would change between on and off.

Use a double pole relay controlled by the flip flop signal that would switch between pwer to the red or power to the green LED leads.

good luck.

Posted By: ppereira
Date Posted: October 16, 2006 at 7:43 PM

Sorry but I'm new to electronics - just know the basic. Could you draw me a schematic of how that would look like?

-------------
Paul

Posted By: coppellstereo
Date Posted: October 17, 2006 at 2:41 PM

it is 12v+ when locked and unlocked?

-------------

Posted By: ppereira
Date Posted: October 17, 2006 at 8:14 PM

It's 12V on both the lock and unlock wires. The voltage drops to zero momentarily when either of the switches is pressed and then returns back to 12V.

-------------
Paul

Posted By: fingaz22
Date Posted: October 17, 2006 at 8:32 PM

what kind of car or truck what year are we talking about? are you sure they don't rest @ ground (-) and have a momentary positive pulse to lock or unlock?

-------------
JUST ONE MORE AMP!!!
hu,alpine cva 1005/dva 5205
sound processor,symmetry(first one).
sub amp,power 1000 the terminator.(1992).
subs,spl comp dual 1 ohms.
punch 150hd on a 10" ev.
alotofhighs

Posted By: ppereira
Date Posted: October 18, 2006 at 10:17 PM

Yes I'm sure. It's a 99 Expedition.

-------------
Paul

Posted By: fingaz22
Date Posted: October 18, 2006 at 10:44 PM

well it's diffently a pulsed negitive system i check on that. so when the voltage drops out as you stated, what is happening is when the switch is pressed it is sending a neg(-) pulse to the respective side of the lock actuator. there's a few differnt places you can tap into the system ,

Door Lock

Pink / YELLOW (-)

Keyless Module under Dash

Door Unlock

Pink/Light Green(-)

Keyless Module under Dash

Driver's Lock

Pink/Black

Driver's Door JAM Boot

Driver's Unlock

RED / Orange

Driver's Door JAM Boot

for getting it to work well what "dias_ryan" wrote would be the cut and dry without having a ton of stuff to do one simply operation that is desired. i did a google search and got all the info i would need if doing this myself with a flip flop curcuit. here's the link https://www.talkingelectronics.com/FreeProjects/5-Projects/Page16.html

with a little electronic skill and time. you be on your way. good luck and let us know how you make out

-------------
JUST ONE MORE AMP!!!
hu,alpine cva 1005/dva 5205
sound processor,symmetry(first one).
sub amp,power 1000 the terminator.(1992).
subs,spl comp dual 1 ohms.
punch 150hd on a 10" ev.
alotofhighs

Posted By: ppereira
Date Posted: October 19, 2006 at 9:43 PM

Thanks for the info. I'll try that out and let you know.

-------------
Paul

Posted By: angelars
Date Posted: November 10, 2006 at 9:28 AM

I thought Radio Shack used to sell LEDS with built in circuits like this. They had three states, red, yellow and orange.