Minilab-PSU/firmware/display_test_ssd1306/display_test_ssd1306.ino

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(23, 19); // SDA, SCL
  Serial.println("\nI2C Scanner");
}

void loop() {
  byte error, address;
  int nDevices = 0;

  for (address = 1; address < 127; address++) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0) {
      Serial.printf("I2C device found at 0x%02X\n", address);
      nDevices++;
    }
  }

  if (nDevices == 0)
    Serial.println("No I2C devices found");
  else
    Serial.println("Scan done.");

  delay(2000);
}