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Originally Posted by Billfred
Is there an easy way to hook some sort of LED or similar object that indicates that a certain switch is on?
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A safe method is to simply use a DPDT switch from Radio Shack and a 9 volt battery ignoring the power pin altogether. Hook up the competition port pins to one side of the switch and an LED/resistor/9volt to the isolated DPDT pins on the other side of the switch. When the switch is "on" the LED will also be "on", but the LED is actually on a separate circuit powered by the 9v battery.
This is probably the normal method most teams use for LEDs on the OI.