How to change display using OLED?

Projects Programming
1

I'm using an OLED 128x64 display and using the u8g library. I'm trying to change the display yung two buttons. One for the previous and one for the next display.

I have this code to change display:

void changeDisplay()
{
     buttonStateA1 = digitalRead(btnNextPage);
     buttonStateB1 = digitalRead(btnPreviousPage);

     if (buttonStateA1 == HIGH)
     {
         u8g.firstPage();
         do
          {
             fluidLevel(); //function to display level if fluid
           }
          while (u8g.nextPage());
      }

      if (buttonStateB1 == HIGH)
     {
         u8g.firstPage();
         do
          {
             dripRate(); //function to display fluid drip rate
           }
          while (u8g.nextPage());
      }

}

I can switch display but only when I'm pressing down on the button. I want it to display the other one when I press it once and change when I press the other one.

This function is also in the void loop() of my code.

Thank you for any replies!

2

I can switch display but only when I'm pressing down on the button. I want it to display the other one when I press it once and change when I press the other one.

You need to detect when buttons become pressed rather than when they are pressed. Take a look at the StateChangeDetction example in the IDE

3

UKHeliBob:
You need to detect when buttons become pressed rather than when they are pressed. Take a look at the StateChangeDetction example in the IDE

Thank you. I still have a problem. I tried using bool functions to each button, I can change displays but the timer on the other display stops displaying the real time rather, it stops until I change display and return to the previous display with the timer in it.

4

Post your code as it is now with the changes that you made

5

It's the same as the first one but with the buttonState ! lastButtonState decision.

If I enclose the function in do while loop in void loop, I can change displays but only when I hold press on the button. If I don't, I can change display. the display doesn't get cleared but the time on the display stops, until I change to the next display and go back. It is just then where the timer updates but stops again until I change display and go back again.

6

Where is lastButtonState updated?

Please remember to use code tags when posting code.

7

grIMAG3:

boolean dispState =true;

void changeDisplay()
{
    buttonStateA1 = digitalRead(btnNextPage);
    buttonStateB1 = digitalRead(btnPreviousPage);

if (buttonStateA1 != lastButtonStateA1)
{
    if (buttonStateA1 == HIGH && dispState)
    {
        u8g.firstPage();
        do
         {
            fluidLevel(); //function to display level if fluid
          }
         while (u8g.nextPage());
     dispState = false;
     }
}

if (buttonStateA1 != lastButtonStateA1)
{
     if (buttonStateB1 == HIGH && !dispState)
    {
        u8g.firstPage();
        do
         {
            dripRate(); //function to display fluid drip rate
          }
         while (u8g.nextPage());
       dispState = true;
     }
  }
}




sorry it took some time. I'm using my phone to reply. We don't have wifi at home so I'm using mobile data to access the internet.
8

TheMemberFormerlyKnownAsAWOL:
Where is lastButtonState updated?

Please remember to use code tags when posting code.

I added it before the last curly bracket of the function. Same issue with the timer stopping.

9

grIMAG3:
I added it before the last curly bracket of the function.

Post your code.
All of it.

10

TheMemberFormerlyKnownAsAWOL:
Post your code.
All of it.

Okay. Going to post it in a few hours. Mobile internet is really slow in my country.