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Author Topic: General Question Input/Pulldown?  (Read 228 times)
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Hi,

i just started to play around with an Arduino Uno.
I have a digital pin as an input. When i just attach a wire to the pin the pin-status becomes high, and stays. There is only the wire hanging in the air...

So i assume that i must use an external pulldown-resistor on any (digital)input, is that right?

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I don't think you connected the grounds, Dave.
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Or, cheaper still, use the built-in pullups.
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And than use the switches to switch to gnd?

thanks! smiley-wink
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