ESP32-CAM_With_SSD1306.ino

// A simple Arduino project to show how to use a SSD1306 OLED display with ESP32-CAM.
// The reason why this is interesting is that the SSD1306 uses I2C, not SPI.
// Since the ESP32-CAM doesn't have I2C pins, we have to use the Wire lib to define our own I2C pins.

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

// ESP32-CAM doesn't have dedicated i2c pins, so we define our own. Let's choose 15 and 14
#define I2C_SDA 15
#define I2C_SCL 14
TwoWire I2Cbus = TwoWire(0);

// Display defines
#define SCREEN_WIDTH    128
#define SCREEN_HEIGHT   64
#define OLED_RESET      -1
#define SCREEN_ADDRESS  0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &I2Cbus, OLED_RESET);

void setup()
{
  Serial.begin(115200);

  // Initialize I2C with our defined pins
  I2Cbus.begin(I2C_SDA, I2C_SCL, 100000);

  Serial.println("Initialize display");

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS))
  {
    Serial.printf("SSD1306 OLED display failed to initalize.\nCheck that display SDA is connected to pin %d and SCL connected to pin %d\n", I2C_SDA, I2C_SCL);
    while (true);
  }

  Serial.println("Show 'Hello World!' on display");
  display.clearDisplay();
  display.setCursor(0, 0);
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
  display.print("Hello\nWorld!");
  display.display();
}

void loop()
{
}