error when several ssd1306 128x64

[Qu4zar]

• Arduino board: ARDUINO UNO

• Arduino IDE version (found in Arduino -> About Arduino menu): 2.1.1

• List the steps to reproduce the problem below (if possible attach a sketch or
  copy the sketch code in too):
  My problem
  I can't use 2 SSD1306 at the same time.
  I have 2 SSD1306 128x64 but when I define SSD1306_128_64 in the Adafruit_SSD1306.h program, it doesn't work (only on 1 screen).
  I only can define 1 screen if I use the "new way", display(w,h,wire,-1) and I didn't find a solution in the forum.

I can define SSD1306_128_32, it works, but the words size is too big for my application.

My Sketch :
#include <Wire.h>
#include <Adafruit_SSD1306.h>

//Adafruit_SSD1306 ecranOLED0(128, 64, &Wire, -1);
//Adafruit_SSD1306 ecranOLED1(128, 64, &Wire, -1);

Adafruit_SSD1306 display1(0);
Adafruit_SSD1306 display2(1);

void setup() {
// Initialisation des écrans avec leurs adresses I2C
display1.begin(SSD1306_SWITCHCAPVCC, 0x3C);
display2.begin(SSD1306_SWITCHCAPVCC, 0x3D);

// Le reste de votre configuration
}

void loop() {
// Contrôlez les écrans individuellement ici

// Exemple : Afficher du texte sur le premier écran
display1.clearDisplay();
display1.setTextColor(SSD1306_WHITE);
display1.setCursor(0, 0);
display1.println("Oh");
display1.display();

// Exemple : Afficher du texte sur le deuxième écran
display2.clearDisplay();
display2.setTextColor(SSD1306_WHITE);
display2.setCursor(0, 0);
display2.println("mince");
display2.display();

// Le reste de votre code loop
}

[todbot]

You should check the return value from display.begin() to see if the memory allocation is failing. The Uno has little RAM and may not be able to support multiple OLEDs. A version of the above code does work on the RP2040 (Raspberry Pi Pico). I verified this code does work with two displays on the same I2C bus:

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 display0(128, 64, &Wire);
Adafruit_SSD1306 display1(128, 64, &Wire);

void setup() {
  Serial.begin(115200);  
  while(!Serial) {} // wait for USB serial monitor to connect

  Wire.setSCL(17);
  Wire.setSDA(16);

  display0.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display1.begin(SSD1306_SWITCHCAPVCC, 0x3D);

  display0.display();
  display1.display();
  delay(2000); // Pause for 2 seconds
}

void loop() { 
  Serial.printf("time:%ld\n", millis());
  delay(100);
  display0.clearDisplay();
  display0.setTextColor(SSD1306_WHITE);
  display0.setCursor(0, 10);
  display0.println("Hello");
  display0.printf("time0:%ld", millis());
  display0.display();
  display1.clearDisplay();
  display1.setTextColor(SSD1306_WHITE);
  display1.setCursor(0, 10);
  display1.println("World");
  display1.printf("time1:%ld", millis());
  display1.display();
}