pin 3 for adc?

Dippy

Moderator
Basic Manual: Page 60.
Getting Started Manual: Page 17.

Its amazing what you can learn by reading.
Sorry, did that sound sarcastic? Didn't mean to.

And don't get pin/leg numbers confused with Input / Output numbers. Thats the beginner's mistake. And yes, you need a resistor on an LED.
 
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