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Arduino mega Help

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Hey guys

 

Can some one tell me some basics about arduino, becasue i am new to it. i know very basic C language...but i dont know what are all the Inputs on the arduino for.......

 

1. What is the Analog Input used for...can u please give me some examples.

 

2. What is the Digital input used for...examples plz.

 

3. communication...example plz.

 

and i have no idea what PWM is for......i have used it for LED blinking but what else can it be used for???

 

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