Running ESP32 with two displays

Hi,

I’m trying to run two displays off the ESP32 dev w/OLED. The 128x64 OLED which it’s a part of the board and the 1.2 7-segment LED from Adafruit (Adafruit 1.2 4-Digit 7-Segment Display w/I2C Backpack - Red : ID 1270 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits). Both displays use an I2C bus.

The code below works for the OLED display but if I uncomment the line //matrix.begin(0x70); //init 7seg, the OLED stops working.

I tried several combination using the Wire library but just cannot get it right. For some reasons, the two displays cannot work in harmony.

Any help is appreciated.
TIA

#include <Wire.h>
#include <dummy.h> //for esp32
#include "Adafruit_LEDBackpack.h"
#include <Adafruit_GFX.h>
#include "SSD1306Wire.h"
#include "OLEDDisplayUi.h"  // Include the UI lib

#define seg_sda 2     //i2c SDA 7 segments
#define oled_scl 4    //SCL OLED
#define oled_sda 5    //SDA OLED
#define seg_scl 15    //i2c SCL 7 segments

Adafruit_7segment matrix = Adafruit_7segment();

SSD1306Wire display(0x3c, oled_sda, oled_scl);  //SDA/SCL
OLEDDisplayUi ui (&display);

TwoWire Wire1 = TwoWire(1);

void setup() {
  Serial.begin(115200);
  Serial.println();
  Serial.println("Setup start...");

  Wire.begin(seg_sda, seg_scl);
  Wire1.begin(oled_sda, oled_scl);

  //matrix.begin(0x70); //init 7seg display

  //init OLED
  display.init();
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);

  matrix .clear();  //clear display
  display.clear();  //clear display

  Serial.println("Setup end...");
}

void loop() {
  // 7 seg display
  matrix .clear();  //clear display
  matrix.print(0xBEEF, HEX);
  matrix.writeDisplay();
  delay(1000);

  // OLED
  display.clear();  //clear display
  display.setFont(ArialMT_Plain_10);  // Text alignment demo
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.drawString(0, 10, "Left aligned (0,10)");
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.drawString(64, 22, "Center aligned (64,22)");
  display.setTextAlignment(TEXT_ALIGN_RIGHT);
  display.drawString(128, 33, "Right aligned (128,33)");
  display.display();

  Serial.println("In loop...");
  delay(1000);
}

Try the solution here.