oled_array.ino

#include "Wire.h"
extern "C" { 
#include "utility/twi.h"  // from Wire library, so we can do bus scanning
}

#define TCAADDR 0x70

void tcaselect(uint8_t i) {
  if (i > 7) return;
 
  Wire.beginTransmission(TCAADDR);
  Wire.write(1 << i);
  Wire.endTransmission();  
}

#include <Adafruit_GFX.h>


#include <Adafruit_SSD1306.h>
Adafruit_SSD1306 display1 = Adafruit_SSD1306(-1);
Adafruit_SSD1306 display2 = Adafruit_SSD1306(-1);
Adafruit_SSD1306 display3 = Adafruit_SSD1306(-1);
Adafruit_SSD1306 display4 = Adafruit_SSD1306(-1);

int one = 0;
int two = 5;
int three = 7;
int four = 6;

void displayNumber(Adafruit_SSD1306* disp) {
  disp->clearDisplay();
  disp->setTextSize(1);
  disp->setTextColor(WHITE);
  disp->setCursor(0,0);
  disp->println("asd");
  disp->display();
}

void setup() {
  Wire.begin();
  Serial.begin(9600);
  
  tcaselect(one);
  display1.begin(SSD1306_SWITCHCAPVCC, 0x3C, false);  // initialize with the I2C addr 0x3D (for the 128x64)
  
  tcaselect(two);
  display2.begin(SSD1306_SWITCHCAPVCC, 0x3C, false);  // initialize with the I2C addr 0x3D (for the 128x64)

  tcaselect(three);
  display3.begin(SSD1306_SWITCHCAPVCC, 0x3C, false);  // initialize with the I2C addr 0x3D (for the 128x64)
  
  tcaselect(four);
  display4.begin(SSD1306_SWITCHCAPVCC, 0x3C, false);  // initialize with the I2C addr 0x3D (for the 128x64)

  tcaselect(one);
  display1.display();
  tcaselect(two);
  display2.display();
  tcaselect(three);
  display3.display();
  tcaselect(four);
  display4.display();

  tcaselect(one);   
  display1.clearDisplay();
  tcaselect(two);
  display2.clearDisplay();
  tcaselect(three);
  display3.clearDisplay();
  tcaselect(four);
  display4.clearDisplay();

  tcaselect(one);  
  displayNumber(&display1);  
   
//  tcaselect(two);
//  displayNumber(display2);
//  tcaselect(three);
//  displayNumber(display3);  
//  tcaselect(four);
//  displayNumber(display4);
}

void loop() {
  // put your main code here, to run repeatedly:

}