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  • Yes, I am using a Uno. Commented Feb 27, 2015 at 5:01
  • It would also be helpful to know what else are you powering in your project (sensors, modules etc.), their part numbers and their typical and maximum current consumption. Commented Feb 27, 2015 at 5:12
  • 1
    Is there a problem with an actual switch? You could store state in NVRAM... Commented Feb 27, 2015 at 8:40