Basic circuits with Arduino and diagrams

Basic Arduino circuits, I found it at Arduino site, these diagrams are very useful. They have colors that make easy to visualize, Arduino pins, and show several basic circuits
Circuitos básicos de Arduino, encontrei no site Arduino.cc, são bem interessantes e ajudam nos projetos mais simples, para quem está descobrindo o mundo dos controladores.

Sensores de luz, potenciometro e acoplador optico.

Light sensors, potenciometer, optic coupler.

Motores e leds.

leds and dc motor.