Hello All,
I had taken electronics a few years ago in highschool, and being a programmer professionally, I have sparked some recent interest in playing around with micro controllers.
That being said, I was looking at the CIRC01 on the SIK(http://www.sparkfun.com/products/10173) introduction document.
http://www.sparkfun.com/tutorial/AIK/AR … -REV10.pdf
and a better view of the circuit:
http://ardx.org/src/circ/CIRC01-sheet-SPAR.pdf
There are a few things I don’t quite get after looking at this.
First and foremost, I do not understand why there needs to be a +5 wire, and a ground wire (also it doesn’t specify what pins those wires are supposed to go into, that has me somewhat confused), when there is already a +5 coming from pin 13 to turn the LED on. So I guess I don’t understand why the +5 wire is necessary if you have the pin 13 wire powering the light. I do understand that the ground needs to be there though.
So I guess to summarize what it is I would like to know:
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Why is the +5 Red wire necessary when it is pin 13 that powers the LED?
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Where do the +5 Red and Ground Black wires go to? It never said :\
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Why is the resistor used at all? And why is it after the LED rather than before?
Thanks a bunch everyone!