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Author Topic: what is the ~ pins and what do they do?  (Read 219 times)
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circuitsguy
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« on: May 18, 2012, 11:25:00 pm »
 Bigger Bigger Smaller Smaller Reset Reset
Hey guys,

     I am totally new and was trying the blink sketch for the first time, and I realized, what is the differencce between the i/o pins with ~ and without ~ ? I can't light an led on the one that has the ~ on it. So I was just wondering. THANKS!  smiley-lol
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marco_c
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« Reply #1 on: May 18, 2012, 11:26:45 pm »
 Bigger Bigger Smaller Smaller Reset Reset
The ones with the ~ are PWM pins. You should be able to use them like normal pins.
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MarkT
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« Reply #2 on: May 19, 2012, 06:54:48 am »
 Bigger Bigger Smaller Smaller Reset Reset
Not just "should", they definitely are standard digital pins that can also be used with analogWrite() for PWM (pulse width modulation - see google for more details)

For PWM pins the PWM is turned on when calling analogWrite() and turned off again when calling digitalWrite().  The '~' symbol is, I suppose, a crude representation of a square wave.
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