Hey Folks,
I need your experience to help me with a little modification. I want to add to a silly piece of equipment I have, that everybody likes to break because they can't wait for the unit to reset. What I have is a simple switch that when it is "open" I would like it to turn on a red led. When the switch is closed (unit is reset and ready to be used) the Led turns off. The only catch is that I can not use the switch as part of the circuit for the LED because it also sends a signal back to the equipment and I don't want to load that circuit with extra current. I have 12vdc available and I know how to use resistor values to limit current to the LEDs so that part is easy, I just can't figure out how to use the switch but not use the switch.
Bonus advice..using one of those dual colour LEDs which lights green when circuit is closed, lights red when switch is open.
Many thanks for any advice.
D