Using OLED screen in a class

Using Arduino Programming Questions
1

Hello, I am sorry for my English and confusing lay-out of the question, but it is my first time, and I am just going to try. I have searched for other topics with the same question, but there doesn't seem to be another (or I am really blind).

So I have a question about displaying text on an OLED screen with a void in a class. It maybe a confusing explanation of my question, but is it possible?

This is a part of my code, but it doesn't work. How do I make it work?

#include <Wire.h>                                                                         //library to establish I²C connection        
#include <ThreeWire.h>                                                                    //library to establish I²C communication on every GPOI-pin                                            
#include <Adafruit_GFX.h>                                                                 //library to print and draw on the OLED-display
#include <Adafruit_SSD1306.h>                                                             //library to establish connection with the OLED-display
#include <RtcDS1302.h>                                                                    //library to convert incoming data from the RTC

#define SCREEN_WIDTH 128                                                                  //OLED display width, in pixels
#define SCREEN_HEIGHT 32                                                                  //OLED display height, in pixels
#define OLED_RESET     -1                                                                 //variable to connect the screen with the reset of the arduino (needs to be -1 to share the reset)
#define SCREEN_ADDRESS 0x3C                                                               //adress of the OLED-display
#define modes 3                                                                           //the amount of modes

class mechanical_switch{

  private:

    unsigned char _active_mode = 1;
    String _name[modes];

  public:

    String name[modes];
    
    void change_mode(unsigned char mode ){

      _active_mode = mode;

      display.clearDisplay();
      display.setCursor(2, 2);
      display.setTextSize(2);
      display.print(_name[_active_mode]);
      display.display();

      delay(2500);

    }
};

I am just trying to make it work, so the function change_mode should start if pin 7 is HIGH. The mode should alternate between 1, 2 and 3.

I don't think it is important but I will say it, it is with an Arduino nano ESP32.

2

Please post a complete sketch that illustrates the problem

3

I am really sorry, but it was my own stupidity. I used the function before I declared the display. I have solved it.

1 Like
4

Sometimes, all you need is "a second set of eyes" that have not been staring at the same problem all day. A simple, "What does that do?" from those eyes can make you see things differently that you had been overlooking. We have all been there. Glad you asked.

5

Thank you, I was really long looking over the problem and trying different stuff. But it was a stupidly simple solution.