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Author Topic: When to write pin high/low?  (Read 109 times)
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Riccarr
Portland, Oregon, USA
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« on: November 22, 2012, 02:04:22 pm »
 Bigger Bigger Smaller Smaller Reset Reset
Hello

Basic question.

During the course of looping my program and performing digitalWrites to pins, if I write a HIGH to a pin so that it turns on a transistor, do I need to keep writing HIGH each time through loop to maintain the pin in its HIGH state thus keeping the transistor switched on?

Or do I need to only write to the pin when I want to change its state?

Thanks
Eric
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holmes4
Poole, Dorset, UK
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« Reply #1 on: November 22, 2012, 02:06:33 pm »
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you only write to change its state.

Mark
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fungus
Valencia, Spain
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« Reply #2 on: November 22, 2012, 02:09:53 pm »
 Bigger Bigger Smaller Smaller Reset Reset
Quote from: Riccarr on November 22, 2012, 02:04:22 pm
During the course of looping my program and performing digitalWrites to pins, if I write a HIGH to a pin so that it turns on a transistor, do I need to keep writing HIGH each time through loop to maintain the pin in its HIGH state thus keeping the transistor switched on?

No.
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robtillaart
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In theory there is no difference between theory and practice, however in practice there are many...
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« Reply #3 on: November 22, 2012, 02:19:56 pm »
 Bigger Bigger Smaller Smaller Reset Reset
but it doesn't hurt either - except for a few CPU cycles burned
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Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -

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