#include <Wire.h>

void setup()
{
  Wire.begin();

  Serial.begin(9600);
  Serial.println("www.santy.cz - zdroj arduino.cc");
  Serial.println("Scanner I2C sbernice");
}

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

  Serial.println("Skenuji...");

  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C zarizeni nalezeno na adrese 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4)
    {
      Serial.print("Neznama chyba na adrese 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }
  }
  if (nDevices == 0)
    Serial.println("Zadne zarizeni nenalezeno\n");
  else
    Serial.println("Hotovo. (Dalsi sken za 5 sec...)\n");

  delay(5000);           // wait 5 seconds for next scan
}