Tutorial de arduinohttp://www.ladyada.net/learn/arduino/index.html
* Lesson 0
Pre-flight check...Is your Arduino and computer ready?
* Lesson 1
The "Hello World!" of electronics, a simple blinking light
* Lesson 2
Sketches, variables, procedures and hacking code
* Lesson 3
Breadboards, resistors and LEDs, schematics, and basic RGB color-mixing
* Lesson 4
The serial library and binary data - getting chatty with Arduino and crunching numbers
* Lesson 5
Buttons & switches, digital inputs, pull-up and pull-down resistors, if/if-else statements, debouncing and your first contract product design.
* Lesson 6
LEDs in more detail, Kirchoff's Voltage Law, Ohm's Law and a peek at the potentiometer