15Dec
Smart Display Interface Using SSD1306 OLED & ESP32
The SSD1306 is a popular controller used in OLED (Organic Light Emitting Diode) displays, most commonly found in small monochrome displays like 128×64 or 128×32 resolution screens. These displays are perfect for small embedded projects like IoT dashboards, sensor readouts, clocks, etc.
📦 1. What is SSD1306?
- SSD1306 is a display driver IC developed by Solomon Systech.
- It controls monochrome OLED panels using I²C or SPI communication.
- Often embedded in 0.96-inch or 1.3-inch OLED displays.
📐 2. Common Specifications
| Feature | Description |
|---|---|
| Resolution | 128×64 or 128×32 pixels |
| Display Type | Monochrome OLED (white/blue/yellow) |
| Interface | I²C (2-wire) or SPI (4-wire) |
| Voltage | 3.3V to 5V (check module) |
| Power Consumption | Very low (great for battery use) |
| Color | 1-bit (pixel on or off) |
| Size (Popular) | 0.96″ diagonal |
🧪 3. How it Works
- The SSD1306 manages display memory and drives OLED pixels directly.
- It includes a built-in graphics RAM (GDDRAM).
- Each pixel is controlled by setting bits in this memory.
- The controller handles:
- Display refreshing
- Contrast adjustment
- Scrolling (horizontal and vertical)
- Power-saving modes
🔌 4. Wiring SSD1306 to ESP32 (I²C)
Assuming you’re using an I²C SSD1306 (4 pins):
| SSD1306 Pin | ESP32 Pin | Description |
|---|---|---|
| VCC | 3.3V or 5V | Power supply |
| GND | GND | Ground |
| SDA | GPIO 21 | I²C data |
| SCL | GPIO 22 | I²C clock |
📌 Some displays use SPI (7 pins). Let me know if you’re using SPI instead.
🔧 5. ESP32 Setup
✅ Required Libraries:
Install via Library Manager:
Adafruit SSD1306Adafruit GFX Library🧠 6. Basic Code Example (128×64 I²C)
HOW TO OPERATE
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width
#define SCREEN_HEIGHT 32 // OLED display height
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire);
void setup() {
Wire.begin();
display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Address may vary
display.clearDisplay();
display.display();
}
void loop() {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(5, 5);
display.println("hello");
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(5, 20);
display.println("AKASH ");
// Draw a rectangle
display.drawRect(0, 0, 125, 32, WHITE);
// Display the image
display.display();
delay(2000);
}
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