Inputs to GPIO

[Adarsh Singh]

Hey,
I'm very new to raspberry pi and I am not able to understand what is the difference between
GPIO.high and
GPIL.low
Thanks for any help.

[bytesoup]

Hi Adarsh,

From this page : https://www.raspberrypi.org/documentation/usage/gpio/

...When the pin is HIGH it outputs 3.3 volts (3v3); when the pin is LOW it is off....

[Adarsh Singh]

Hi Adarsh,

From this page : https://www.raspberrypi.org/documentation/usage/gpio/

...When the pin is HIGH it outputs 3.3 volts (3v3); when the pin is LOW it is off....

I know that this is for the output, But does this also apply on inputs.
eg
While gpio2.high
print ('button pressed')?

[joan]

A GPIO in mode INPUT will

• read 1 (high) if 3V3 is connected
• read 0 (low) if 0V is connected

[Adarsh Singh]

A GPIO in mode INPUT will

• read 1 (high) if 3V3 is connected
• read 0 (low) if 0V is connected

ok now i get it

[Burngate]

From this page : https://www.raspberrypi.org/documentation/usage/gpio/

... When the pin is HIGH it outputs 3.3 volts (3v3); when the pin is LOW it is off ...

I'm not sure I agree with the second half of that ...
... When the GPIO pin is LOW it outputs 0v - so if you connect a LED plus resistor from a 3v3 pin to the GPIO, the LED will light
- if it were off, as in a switch is off, no current could flow and the LED wouldn't light.

Possibly nit-picking, but also possibly giving the reader the wrong idea from the start.

[gordon77]

Agreed, LOW means connected to gnd.

[Adarsh Singh]

Thanks for all your help.
I have now understood this