SSD1306 OLED with Nordic nRF52840 DK

Wiring for the SSD1306 OLED 128x64 (I2C) on the Nordic nRF52840 DK (nRF52840-QIAA, 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: 5 V from the 5V pin.
• I2C uses the board’s default pins P0.26 (SDA) and P0.27 (SCL). Most modules include pull-up resistors; if the part is not found, check them and swap-test SDA/SCL.

Test code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin();  // SDA = P0.26, SCL = P0.27 (the board's default I2C pins)
  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: adafruit:nrf52:pca10056. Plug USB into the port on the short edge (interface MCU, J2) and set the power switch to ON; before the first Arduino sketch, burn the Adafruit bootloader and SoftDevice once.

Questions

Which Nordic nRF52840 DK pins do I use for the SSD1306 OLED?

GND → GND, VCC → 5V, SCL → P0.27, SDA → P0.26.

Does the SSD1306 OLED work with the Nordic nRF52840 DK at 3.3 V?

Yes: the SSD1306 OLED runs at 3.3-5 V and the Nordic nRF52840 DK 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 Nordic nRF52840 DK pinout · SSD1306 OLED 128x64 (I2C): all pins and data

The SSD1306 OLED on other boards

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