Is it okay if output pin receive current?

[msulum78]

Hello everyone, I am new to raspberry pi and have a bad english, I am sorry.
I just want to know is it okay if output pin receive current?
If it is not okay, what will happened to raspberry pi?

Thanks You

[drgeoff]

Hello everyone, I am new to raspberry pi and have a bad english, I am sorry.
I just want to know is it okay if output pin receive current?
If it is not okay, what will happened to raspberry pi?

Thanks You

Your question is not clear.

When a GPIO pin is set as output and low it will sink current. That means current can flow into the RPi.

[pcmanbob]

If you explained in more detail what exactly you intend to connect to a gpio output that would be supplying current to the the gpio pin we could provide a helpful answer.

but in general you should only connect 3.3v to a gpio pin and you should limit the current to 16mA as either source or sink.

is this related to your post about connecting a relay board to the pi causing the screen to blank ?

[boyoh]

This might help you to understand how when
A GPIO O/P can be set to sink or source current
(A) GPIO 3.3v O/P—(R)----(aLEDc)--(B) GPIO-O/P-

Operation
GPIO (A) output( active) 1 high
GPIO (B) output (active) 0 low
LED ON

GPIO( A) output( active) 1 high
GPIO (B) output ( In active) 1 high
LED OFF

Remember the LED is a Diode

Regards BoyOh