Hacking my home alarm system (LED stuff)
I have read some good information here on this subject but I am afraid my skill level just calls for an answer that is more specific to my situation. Thanks in advance for your help.
My home alarm only indicates that is is disarmed by an audible response to the remote key fob button. There is a light on the panel that says it is armed or disarmed but the light is not visible from outside the house.
I located the LED which stays on when armed. It is red in color and is mounted to the circuit board. It is rectangular and measures maybe 4 mm across. I have already tapped a wire into the connectors and it measures 1.62v when lit up.
My intention is to run a thin wire all the way to the outside of the house where I can mount another LED so that I can see it when I drive up. If my remote button is working from this distance, I should be able to turn off the system and see that the light has gone off.
Here is the problem:
I purchased a green LED for $2 at my local electronics supply store. Spoke with the fellow there about what I was doing and he was not much help. The packaging on the LED said only that it was rated for 2v. I figured that with 1.62v available it should glow enough for me to see it. The store did not have any 1.5v LED's. I tested polarity and connected the LED properly considering that it is a diode and will only work when the electricity flows one way. It will not light up. For that matter, when I hooked it up to a 1.5v dry cell just to test, it still does not light up. Not having a power supply I chose not to try a higher voltage as my next option is 3v.
I have also scoured the internet looking for a board mounted LED that looks like this (low output, rectangular and flat)but no luck. This unit seems quite common in various toys and electronic devices around the house but all I find when I look for it is the dome shaped LEDs. I figured if I could match it exactly then it would work but nothing is printed on it to help me figure it out.
I realize that there will be those who wish to warn me about voiding warrantees and all that stuff - duly noted.
Can someone give an electronic newb some advice? Many thanks.