SSD1306 OLED with ESP32-S3-DevKitC-1

Wiring for the SSD1306 OLED 128x64 (I2C) on the ESP32-S3-DevKitC-1 (ESP32-S3, 3.3 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

Check before you power it on

• Supply: 3.3 V from the 3V3 pin.
• I2C can use almost any pins on the ESP32-S3-DevKitC-1; 8 (SDA) and 9 (SCL) are the defaults. If the part is not found, the wires may be crossed: try Wire.begin with the two exchanged.

Test code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(8, 9);  // SDA = 8, SCL = 9
  Wire.beginTransmission(0x3C);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "SSD1306 OLED 128x64 (I2C) found at 0x3C" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Arduino board: esp32:esp32:esp32s3. Use the port labelled UART. If uploading does not start, hold BOOT, press and release RESET, then release BOOT.

Questions

Which ESP32-S3-DevKitC-1 pins do I use for the SSD1306 OLED?

GND → G, VCC → 3V3, SCL → 9, SDA → 8.

Does the SSD1306 OLED work with the ESP32-S3-DevKitC-1 at 3.3 V?

Yes: the SSD1306 OLED runs at 3.3-5 V and the ESP32-S3-DevKitC-1 uses 3.3 V signals, so no level shifting is needed.

What is the I2C address of the SSD1306 OLED?

0x3C or 0x3D. An I2C scan (BoardPilot does it for you) shows which one your module uses.

Full ESP32-S3-DevKitC-1 pinout · SSD1306 OLED 128x64 (I2C): all pins and data

The SSD1306 OLED on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

Other parts on the ESP32-S3-DevKitC-1

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