Understanding a "mode"-type structure

Forum 2005-2010 (read only) Software Syntax & Programs
1

Hello there community!

Currently i am working on a project with buttons and a servo.

I want the circuit to let the user control the servo, and if needed, store the actual position of the servo.

I managed to get the circuit working flawlessly.

But now i am curious:

I am working with the Buttonlibrary and have a "record" button and some "slot" buttons.

Currently i am checking whether the "record" button is held down, and if another slot button is held down simultaneously.

I want to implement a "record mode", so that i press the record button, then a LED goes on, and nothing happens until one of the slot buttons is pressed, the variable is stored, and it exits the "record mode"

I dont have any clue how to do this, as the void loop() is running through and through and i cant stop it until something happens.

Thanks for a possible head-up

Greetings

apogee

2

When the "record" button is pressed, call a function that loops, checking the state of the "slot" buttons, until the state of one of the "slot" buttons changes to pressed.

3

Thanks for the answer, Paul!

Totally simple at the first glance.

How can i exit the "void checkbuttons();" if a button ist pressed and go back to the void loop(); ? I searched the Arduino-Reference, but i cant find anything like "exit".

Or am i getting something totally wrong here?

4

You can return from a function by using the return keyword.

void checkButtons()
{
   for(;;)
   {
      if(digitalRead(slotBtn1) == HIGH)
         return;
      if(digitalRead(slotBtn2) == HIGH)
         return;
   }
}

If you care which button was pressed:

int checkButtons()
{
   for(;;)
   {
      if(digitalRead(slotBtn1) == HIGH)
         return 1;
      if(digitalRead(slotBtn2) == HIGH)
         return 2;
   }
}

(Or return slotBtn1 or slotBtn2...)

5

Now thats a precise and useful answer!

Many thanks for the good tips, Paul.

As soon as i come back from work, ill write my code.

Greetings,

apogee