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Door Lock LED


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ppereira 
Member - Posts: 5
Member spacespace
Joined: August 31, 2006
Posted: October 15, 2006 at 8:35 PM / IP Logged  

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
dias_ryan 
Member - Posts: 11
Member spacespace
Joined: August 01, 2006
Location: Canada
Posted: October 16, 2006 at 1:23 PM / IP Logged  

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.

ppereira 
Member - Posts: 5
Member spacespace
Joined: August 31, 2006
Posted: October 16, 2006 at 7:43 PM / IP Logged  

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

Paul
coppellstereo 
Silver - Posts: 785
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Joined: November 21, 2005
Location: United States
Posted: October 17, 2006 at 2:41 PM / IP Logged  
it is 12v+ when locked and unlocked?
ppereira 
Member - Posts: 5
Member spacespace
Joined: August 31, 2006
Posted: October 17, 2006 at 8:14 PM / IP Logged  

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
fingaz22 
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Silver spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: March 11, 2005
Location: United States
Posted: October 17, 2006 at 8:32 PM / IP Logged  
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
ppereira 
Member - Posts: 5
Member spacespace
Joined: August 31, 2006
Posted: October 18, 2006 at 10:17 PM / IP Logged  
Yes I'm sure. It's a 99 Expedition.
Paul
fingaz22 
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Silver spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: March 11, 2005
Location: United States
Posted: October 18, 2006 at 10:44 PM / IP Logged  
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 LockPink / YELLOW (-) Keyless Module under Dash 
Door UnlockPink/Light Green(-) Keyless Module under Dash 

or

Driver's LockPink/Black Driver's Door JAM Boot 

Driver's UnlockRED / 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  http://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
ppereira 
Member - Posts: 5
Member spacespace
Joined: August 31, 2006
Posted: October 19, 2006 at 9:43 PM / IP Logged  
Thanks for the info. I'll try that out and let you know.
Paul
angelars 
Copper - Posts: 176
Copper spacespace
Joined: November 06, 2006
Location: United States
Posted: November 10, 2006 at 9:28 AM / IP Logged  
I thought Radio Shack used to sell LEDS with built in circuits like this. They had three states, red, yellow and orange.

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