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Author Flashing LED - Quick Question
kazazza
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Registered: 5th Oct 09
Location: Herne Bay, Kent
User status: Offline
17th Nov 09 at 20:50   View User's Profile U2U Member Reply With Quote
Ive got a flashing led to make it look like I have an alarm. Where can I wire it to so that it comes on when the ignition is off and goes off when the ignition is on??
moka
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Registered: 11th Mar 06
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17th Nov 09 at 20:51   View User's Profile U2U Member Reply With Quote
I would also like to know this!
Ste
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Registered: 5th Mar 03
Location: Taif, Saudi Arabia
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17th Nov 09 at 20:51   View Garage View User's Profile U2U Member Reply With Quote
Use a relay via the cig lighter


EDIT: I'll do a diagram as its easier to explain

[Edited on 17-11-2009 by Ste W]

I would rather lose by a mile because i built my own car, than win by an inch because someone else built it for me.
*JonnyG*
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Registered: 2nd Jun 08
Location: Lincolnshire
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17th Nov 09 at 21:02   View User's Profile U2U Member Reply With Quote
I would just put a switch in it tbh!
kazazza
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Registered: 5th Oct 09
Location: Herne Bay, Kent
User status: Offline
17th Nov 09 at 21:04   View User's Profile U2U Member Reply With Quote
Yeah, ive got a spare switch, i'll prob just do that. Would have been good if there was a nice easy way to do it so i didnt have to do that tho.
ed
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Registered: 10th Sep 03
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17th Nov 09 at 21:08   View User's Profile U2U Member Reply With Quote
You'll need a 4v voltage regulator, unless you've bought a 12v flashing LED.
kazazza
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Registered: 5th Oct 09
Location: Herne Bay, Kent
User status: Offline
17th Nov 09 at 21:15   View User's Profile U2U Member Reply With Quote
Yeah ive bought an led that is pre-wired to flash..
Ste
Premium Member

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Registered: 5th Mar 03
Location: Taif, Saudi Arabia
User status: Offline
17th Nov 09 at 21:31   View Garage View User's Profile U2U Member Reply With Quote
get a relay. they have a normally open and a normally closed side of the switch. get a perm live to the switch common and the energised side wire up to a switched live. when power is applied to the relay, the switch is thrown so no power passes to the led. when power is off the led will light.

wire it up so that on the relay:

pin 86 to earth
pin 85 to switched live
pin 30 to permanant live
pin 87 isn't used
pin 87a to the positive side of the LED

I'm asuming it's a 12v flashing LED so you will not need a resistor.

I would rather lose by a mile because i built my own car, than win by an inch because someone else built it for me.
John
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Registered: 30th Jun 03
User status: Offline
17th Nov 09 at 21:34   View User's Profile U2U Member Reply With Quote
Check if an ignition live goes to ground when it's turned off.

If so, a permanent live and ignition live will turn it on when the ignition is off.

 
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