#include <Wire.h>

void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.println("\nI2C Scanner");
}

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

  Serial.println("Scanning...");

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

    if (error == 0) {
      Serial.print("Device found at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);
      Serial.println(" !");
      deviceCount++;
    }
    else if (error == 4) {
      Serial.print("Unknow error at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.println(address, HEX);
    }    
  }
  if (deviceCount == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("Done\n");

  delay(5000);
}