Fake alarm (Flashing LED)
Thread Starter
Junior Member
Joined: Apr 2003
Posts: 21
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From: Roswell, GA
Fake alarm (Flashing LED)
Hey wassup guys i got a question that maybe somebody can help me with...
Alright what i want to do is make an led that you could buy from radio shack or something and have it flash like one does from an alarm system but ONLY when the car is turned off...now i have been thinking about how to do this and the only thing i can think is use like a resistor so high that you have two power sources running to the light, one is a constant and one turns off whenever the car is turned off...im not sure if this would even work just a "sort of" theory...well any suggestions are appreciated.. thanks!
Alright what i want to do is make an led that you could buy from radio shack or something and have it flash like one does from an alarm system but ONLY when the car is turned off...now i have been thinking about how to do this and the only thing i can think is use like a resistor so high that you have two power sources running to the light, one is a constant and one turns off whenever the car is turned off...im not sure if this would even work just a "sort of" theory...well any suggestions are appreciated.. thanks!
Older Honda Fanatic
Joined: Jul 2002
Posts: 3,154
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From: Adirondacks of NY
www.parts-express.com has pre-wired flashing LED's, with a holder and ready to accept 12 volts... you'll have to wire the positive side to a constant 12 volt source, like the radio back-up circuit... wire the negative to the accessory lead comming from the key switch... when the key is off, this wire shows a negative signal and will ground the LED, making it flash. Its very easy. 
Thread Starter
Junior Member
Joined: Apr 2003
Posts: 21
Likes: 0
From: Roswell, GA
how do i find the accessory lead coming from the ignition switch though...i mean i went to radio shack and bought a flashing led and a resistor to convert it to 12 volts and plugs it up to a switch and just grounded it to a bolt and i just turn the switch on and it turns itself on BUT i wanna have it turn on automatically just dont know how to do that...
Thread Starter
Junior Member
Joined: Apr 2003
Posts: 21
Likes: 0
From: Roswell, GA
ok thanks but just a question how exactly does this work? Like i understand the constant 12volts but how is this wire that im connecting the negative to special than any other wire?
Currently Riding his BIKE
Joined: Mar 2003
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From: Moved From RI to sunny FL
haha this thred is perfect timing im going to probly by the stock "securty" button that goes in the dash and i just wanted it to go on when my car is off thanks guys !:thumbup:
im going to probly by the stock "securty" button that goes in the dash and i just wanted it to go on when my car is off thanks guys !:thumbup:
Older Honda Fanatic
Joined: Jul 2002
Posts: 3,154
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From: Adirondacks of NY
connect the power to any constant 12 volt source... the radio memory wire is a good choice.
The accessory wire from the ign switch will ground out when the key is off... I say the accessory wire because if you connect to one of the ignition wires the LED will be flashing if you're sitting in your car listening to music with the key in the accessory position... that'd be pretty ghetto if you ask me.
The accessory wire from the ign switch will ground out when the key is off... I say the accessory wire because if you connect to one of the ignition wires the LED will be flashing if you're sitting in your car listening to music with the key in the accessory position... that'd be pretty ghetto if you ask me.