Provide a variable as source for digitalRead();

Projects Programming
1

Is it possible to make something that a digitalRead() command is reading a variable? Not a pin?

My problem is, i want too add an ability to a library and can't alter the library because of lack of knowing and future updates.

The library itself uses "digitalRead(thePin)" to get its value.

Any way to provide a boolean variable to that? Or create something like virtual pins and define a value for them?

2

As long as the variable contains a valid pin number, a variable should work fine. What makes you think it wouldn't?

3

KeithRB:
As long as the variable contains a valid pin number, a variable should work fine. What makes you think it wouldn't?

It should not contain a pin number, it should "simulate" an input

I would like to use for example

somevar = HIGH

digitalRead(somevar) should then return high or low
4

No. You can't do that. The digitalRead() function takes a pin number and reads the physical hardware. You can't "emulate" the digitalRead() function without the library being aware of the emulation.

5

Then I would put a wrapper around digital read:

int myDitigalRead(int var)
{
    
    if (var == -1) return LOW;
    if (var == -2) return HIGH;

    return DigitalRead(var);

}

You have to be careful because HIGH and LOW are valid pin numbers.

6

Then I would put a wrapper around digital read:

That would require a modification to the existing library, which OP seems unwilling, or unable, to modify.

7

The library itself uses "digitalRead(thePin)" to get its value.

Does the library return the value it reads or does it do something with the value read ?

More details of what you are trying to do would help considerably.