Ah i understand a double positive with ignition on, 0v potential no
light. 12v battery to 12v ign on
ignition off 0v battery 12V potential. easy really.
good one Jim
On 04/09/2012 20:28, Andy Cowley (Q2-379) wrote:
Cheers for that.
Looks like it will be easier to go with Jim's suggestion, which as far
as I understand when the ignition is off the wire connected to the
ignition effectively becomes an earth wire & the LED lights up.
On Tuesday, September 4, 2012 5:04:01 PM UTC+1, TomBloke wrote:
I used a pair of 555 timers to create pulses for my central
locking depending on the status of the alarm. It sounds like you
are trying to do the opposite to get a steady-state, which you
could do with a bi-stable (JK flip-flop). You don't really need a
relay to power an LED, they only need a few mA - just do it direct
from a transistor output. It is possible to get bistable relays,
but they're not cheap and it's a bit hammer to nut for what you need.
With either solution (relay or JK) you run the risk of getting out
of sync where you end up with the flashing LED flashing when the
alarm is off and not when it's on. Have you thought about just
connecting it up so it's always on? If you mount it out of line
of sight when driving it wouldn't be a problem??
I'm curious as to whether Jim's solution would work (if I
understood him correctly), because the switched ignition line when
off isn't actually a return path (gnd) it's more just a lack of
voltage. There may be enough leakage current to go between 12V
and the switched ignition to ignite an LED but it's not a "circuit".
On 3 September 2012 23:06, Andy Cowley (Q2-379)
<[email protected] <javascript:>> wrote:
Cheers Jim.
Forgot to mention that it's an aftermarket central locking
kit, not a Ford one.
Also what I was wondering was, is there a relay that could
have a permanent live feed going into it and connections from
the central locking wiring, so that when the momentary signal
is sent from the control box it would switch the relay "on" or
"off" & power would come from the relay to the LED or not
depending on the position of the switch inside the relay.
Hope this explains what it is I am trying to achieve but being
a bear of simple brain I don't always make myself clear.
If no such relay is available then I'll wire it in like you
suggested.
Andy
On Monday, September 3, 2012 9:04:03 PM UTC+1, Andy Cowley
(Q2-379) wrote:
My 2+2 has central locking fitted (no alarm) & doesn't
have a warning LED.
I've got a flashing LED that I was going to wire in so
that it came on when the ignition was switched off, but am
wondering whether I could connect it to the wiring via a
switching relay so that it came on when the car was locked
& went off when it was unlocked.
Any help would be appreciated.
Cheers
Andy
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