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Floating Pins, Pull-Up Resistors and Arduino

Floating Pins on Arduino have always been a bit of mystery to me.  It just never made much sense.  I did this video more for my own sake – just to concrete it in my brain.  I hope it can add some solidarity to  your understanding as well…


  1. Avatar Lionel on May 29, 2015 at 1:55 pm

    Great video. This was one of the first problems i had with arduino and i couldn’t understand why my circuits weren’t working. It was very frustrating and i think most users will have come across it, but no-one tells you about it. You just get resistors placed mysteriously in the examples, and once you step out on your own you get nowhere. So good on you.

    Now i seem to remember i resolved by putting a resistor in the circuit in series with the button (in this example) which seemed to calm the noise. Could that be right?

    All the best,

    • Avatar MICHAEL JAMES on June 6, 2015 at 9:58 pm

      Thanks Lionel! A resistor pulling the Pin to ground would have definitely done the job!

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