Installing Flashing LED for security system

[99 E-klips gs]

I have a 99 Eclipse GS (Non-Spyder) (Non-Turbo) with the stock alarm system. With this security system when it is armed all you get is the Green light in the cluster for 20 seconds. I need more for the area I live in.

I am currently in Electronic Engineering classes and was going to make a flashing LED that flashes constantly on the dash, just like most other alarm systems.
My plan was to go cheap so I am going to make a basic Flashing LED circuit built onto a breadboard (Protoboard).

But the only problem I am having is I am not sure where I need the power supply to come from. I was originally going to have it directly to the battery, but then I will ALWAYS have a LED flashing in my dash even if I am driving. Cant do that.
So I need any type of power supply that is going to be constant while the car is turned off, but no power while the car is running.
And I know the car is intended to have no power output while car is off, so it doesn't kill your battery. but didn't know if there was something I was missing.

Anyone have any ideas?

 

[Mullet_GST]

Why not make a simple Switch? Cause i dont know of many things that would lose power while the car is running. Also if your worried about people stealing it, Why not make a cut off switch too?
Back to the switch maybe a simple push on/off switch?

 

[Kanaka]

I have a 99 Eclipse GS (Non-Spyder) (Non-Turbo) with the stock alarm system. With this security system when it is armed all you get is the Green light in the cluster for 20 seconds. I need more for the area I live in.

I am currently in Electronic Engineering classes and was going to make a flashing LED that flashes constantly on the dash, just like most other alarm systems.
My plan was to go cheap so I am going to make a basic Flashing LED circuit built onto a breadboard (Protoboard).

But the only problem I am having is I am not sure where I need the power supply to come from. I was originally going to have it directly to the battery, but then I will ALWAYS have a LED flashing in my dash even if I am driving. Cant do that.
So I need any type of power supply that is going to be constant while the car is turned off, but no power while the car is running.
And I know the car is intended to have no power output while car is off, so it doesn't kill your battery. but didn't know if there was something I was missing.

Anyone have any ideas?

What about a switch? so you can cut the energy while you're driving, and activate your led strip when you lock your car... I am sure there is a way that you can connect the leds to a circuit but no idea where so the switch idea was the first that came to my mind.


The Led won't kill your battery soon, I always can see mine from the window flashing all night.

 

[99 E-klips gs]

What about a switch? so you can cut the energy while you're driving, and activate your led strip when you lock your car... I am sure there is a way that you can connect the leds to a circuit but no idea where so the switch idea was the first that came to my mind.


The Led won't kill your battery soon, I always can see mine from the window flashing all night.

haha I'm an idiot, I dont know why I just didnt think of a switch. Obvious .
But ya an LED light takes up so little power, it would take a month for it to kill your battery. thanks guys for your help

I was also thinking I could Possibly have a 12v+ constant to the light but make it to where it only completes the circuit when the ignition is off. I dont know how hard that would be to wire though