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Topic: General Question Input/Pulldown? (Read 299 times) previous topic - next topic

dbfox

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?


AWOL

Or, cheaper still, use the built-in pullups.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

dbfox

And than use the switches to switch to gnd?

thanks! ;)

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