I want to install a flashing led (fake alarm) in my car but Instead of of connecting the led to a 1.5v battery I want to connect it directly to the car battery (12v) and have it turn OFF when the ignition is ON. Ignition Led ---------------- Off On On Off What relay should I use? Thank You Jose
I wanted to do this too but I never really thought about how to do it. Also as a good way to protect your car is you could hook up a hidden switch to the starter on your car. if the switch is off it will never start. That's the poor mans car alarm. Josh
Why not just let it flash all the time? It's not like some potential thief is going to be watching it while you drive! Cheers! Chip Shults My robotics, space and CGI web page - http://home.cfl.rr.com/aichip
You don't need a relay. Use a resistor from the LED to ground and put the led at +12. Then use a diode from the junction of the resistor/led to the ignition switch. -Bill