SSD1306 OLED Display

Wiring

OLED Pin	Arduino Pin
VCC	3.3V
GND	GND
SDA	A4
SCL	A5

Code

Install Adafruit SSD1306 + Adafruit GFX libraries.

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
Adafruit_SSD1306 display(128, 64, &Wire);
void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextSize(2); display.setTextColor(WHITE);
  display.setCursor(10, 20); display.println("Hello!");
  display.display();
}
void loop() {}

Specifications

• Resolution: 128×64
• I2C address: 0x3C (default)
• Color: White or Blue

Troubleshooting

• Blank screen — I2C address may be 0x3D on some modules
• Garbled display — Check SDA/SCL wiring, add 4.7k pull-up if long wires