Arduino: Eh, just grab some pliers and bend the pins

The Something Awful Forums > Discussion > Hobbies, Crafts, & Houses > Arduino: Eh, just grab some pliers and bend the pins

Arcsech: Aug 5, 2008

huhu posted:

Just kidding, have my first two questions.

Here is the first thing I'm working on:
http://www.oomlout.com/oom.php/products/ardx/circ-01

What is the purpose of the resistor in the setup? I see that it goes Pin 13 -> LED -> Resistor -> Ground.

Also, there is a wire between 5V on the Arduino board and the + on the bread board. However, there is nothing else connected to the + and with or without this wire the light still works. What is the function of this?

The resistor limits the current through the LED - the Arduino can only push like... 50mA or so, I want to say, so you can just use the pins straight if you need to, but it's a good idea anyway. If you used an LED with no resistor and something that is capable of putting out more current at 5V (like a power supply), then you'd blow out your LED.

I don't understand your second question, it looks like the resistor is connected to the + rail on your breadboard.

Also this kind of stuff is usually a function of the learning electronics megathread, so I don't know if Arduinos all by themselves deserve a thread.

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