Pin.Pull_X

[KittehBit]

Sorry if this is too simple,

but I cant find any information on that Pin.PULL_UP or PULL_DOWN do when I specify a pin.
The documentation said it defnies if a pull up or down resistor is... attached?
But what difference does that make in the code? Do I get a different voltage?

[dhylands]

It controls whether the internal pull-up or pull-down resistor is enabled (the docs are perhaps missing the word 'internal')
http://docs.micropython.org/en/latest/p ... b.Pin.init

[pythoncoder]

...Do I get a different voltage?

The usual use of internal pullup or pulldown resistors is to define the state of input pins which are unconnected. This is useful when connecting switches or pushbuttons. Without a pull, when the switch is open, the state of the pin is undefined: MOS inputs are very high impedance and can float to either level.

There is another use for a pullup with a pin configured as an open drain output, but this is rather more specialised.

[KittehBit]

So, meanwhile i read up on pull up resistors and what floating pins are.
So the chip has internal pull up resistors that i can just turn on in code? Neat

Thanks for the explanation!