Hello,
why i have voltage on input_pullup pin and nothing connected to that pin?
Why do you think it's not to be expected? What would you expect?
I would think that it would be expected. The pin is pulled high by the internal pullup so should read Vcc with a multimeter.
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sterretje:
Why do you think it's not to be expected? What would you expect?I would think that it would be expected. The pin is pulled high by the internal pullup so should read Vcc with a multimeter.
Yeah, but when i change it to INPUT and connect pull down resistor still have around 2 V. I think its not expected because digitalRead didnt work as expected.
What's the value of the pull-down resistor? A schematic (photo of pencil drawing is fine). Which pin are you testing on?
Please show the last loaded sketch; paste it between
** **[code]** **
and
** **[/code]** **
, the so-called code tags.
To be clear, you are concerned with the readings on pins that do not have inputs connected to them? Why?