How to reverse false to true

Projects Programming
1

Just starting ... so of course thousands of questions.

In my sketch, all my buttons and switches are set up with input_pullup.
So, its false so to speak when activated.

I would like to be able to say ..

button_is_pressed = digitalread(button_pin)
if (button_is_pressed)

blah blah

but the digitalread actually returns false when the button is pressed. (as it should)

Here's my loop code

{
Request_Is_Received = digitalRead(Request_Button);
if (Request_Is_Received == LOW) // would like to not have to do this
{
if (Gate_A_Is_Closed() && Gate_B_Is_Closed()) // gates are closed
{
Open_The_Gates();
}
else // gates are not closed so they are open or stuck trying
{
Close_The_Gates();
}
}
}

2 
bool button_is_pressed;

button_is_pressed = !digitalread(button_pin);
4

you may name your variables and constants as you like

const uint8_t DOWN = LOW; // for button input, button connects to GND
const uint8_t UP = HIGH;

buttonState = digitalRead(PIN_button);
  if (buttonState == DOWN) {
// ...
}
5

Thanks Dev .. that's exactly what I was looking for, that will save me a bunch of work arounds.

Button_Is_Pressed = !digitalRead(Button_Pin)

I did know about the !,

I actually do spend a LOT of time in the reference. It honestly seems that the questions I have are not
answered ((in the reference) (or I can find it .. possible))

This is a perfect example. Actually go look at the info on ! 1 little example and 2 sentences.

But thanks TO this forum I understand now that you can even boolean a function. HOW COOL.

6

No, you're not "booleaning the function". You are using the return value of the function in an expression.

You can do much cooler things with functions. Look for a C++ reference online. Almost all of them will explain the standard libraries which are available on the Arduino but never get mentioned in the Arduino reference.

7

The bolean not operator ! is part of the C++ programming language. You probably need to read this: http://www.cplusplus.com/doc/tutorial/operators/ .

You want the section on "logical operators".