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1  Products / The Arduino Starter Kit / Re: About the position of Resistors in project 1 and 2 on: April 19, 2013, 12:52:50 am
Good explanation. Thank.
2  Products / The Arduino Starter Kit / Re: About the position of Resistors in project 1 and 2 on: April 18, 2013, 03:36:02 pm
Analogies are often dangerous...

Regarding the 220 vs 120, well as long as the resistor is bigger than the value you calculated, you're safe and the lower current will safeguard the led, which will just not be as bright.... up to a point of course, too big a resistor and the led will be too dim to see.

I understand that the bigger resistor is the lower current will but I miss some explanation about how to choose the resistor's value.
3  Products / The Arduino Starter Kit / Re: About the position of Resistors in project 1 and 2 on: January 23, 2013, 06:53:18 am
Hi all,

I have a related dude about this project and the resistor's value. If we consider a IF = 20 mA and a VF = 2,6 V (like typical values for a led), I figurate up we have to use a 120 ohms resistor. Why it uses a 220 ohms resistor in the project? I can imagine some possible answers but I have dudes because this guide doesn't include the calculations.

(Excuse my english). 
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