Dear Friends, I try blink example of Pin 13 of Arduino Uno R3 and it run fine as well with other pins for LED. When i tryed to give power through simple power regulator of LM7805 with 10K Pot in VDD adn 220ohm to GND to LED, led burns !!!. I think as per ohm's law, V= IR where V= 5 as output of 780…

Difference between Arduino 5V power and output of 7805 5V power

system January 20, 2013, 1:54pm 4

You probably want to check your voltage regulator to see which leg is which.

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