GPIO output default state?

Getting Started
1

This is a total newbie question…if I have a program that periodically sets one of the digital outputs HIGH via a “while” loop, does the pin automatically go back to LOW when the loop is no longer true?

Here’s an example snippet of what I’m doing:
while(secaccum>=57 && secaccum<=63 && Time.hourFormat12()!=6)
{
digitalWrite(correction, HIGH);
}

Currently, at the end of my void(loop), I have digitalWrite(correction, LOW) so that whenever the while loop is NOT true, the pin is off, but I wasn’t sure if that was really necessary.

Thanks for your input!

2

You are setting a state. A pin’s state does not have a programming scope like a variable does. (You could consider the state to be like a global variable, I suppose, in that it has global scope!) An output pin is HIGH until you set it LOW and v.v. Where you do this in your code is immaterial.

3

You have to program to let it go to LOW or it will just remain at the current state (HIGH) :slight_smile:

4

Thanks, that’s what I thought! I knew that typically variables stay set (as you would want them to!), but I’ve never dealt with microcontroller outputs before.

1 Like