I am trying to figure out how/where to install a switch onto my Arduino Uno (via a shield) to act as a main power on/off while using the external 2.1mm power plug. Or am I forced to power up through Vin with the switch in series if I want a main power switch?
Thanks in advance.
One simple solution is to either buy or make a cable that has a female 2.1mm power plug on one end, a male 2.1mm power plug on the other end, and a switch in-between. Adafruit sells such a cable: http://www.adafruit.com/products/1125
Can remove the reverse polarity diode and wire in a series switch there.
Why do you want to do this?
Thanks for the feedback.
As for "why?", it's a very artificial situation. Have an entire board wired up already and powered by a battery pack with the plug. My son found a cool switch online that he's dying to use and I want to install it, without messing too much with what's already up and working.