I2CScanner.java

import java.io.IOException;

import com.pi4j.io.i2c.I2CBus;
import com.pi4j.io.i2c.I2CDevice;
import com.pi4j.io.i2c.I2CFactory;
import com.pi4j.io.i2c.I2CFactory.UnsupportedBusNumberException;
import com.pi4j.platform.PlatformAlreadyAssignedException;
import com.pi4j.util.Console;

public class I2CScanner {

   public static final int TOUCH_KEYPAD_ADDR = 0x57; // address pin not connected (FLOATING)
   
   public static void main(String[] args) 
        throws InterruptedException, PlatformAlreadyAssignedException, IOException, UnsupportedBusNumberException 
   {
      final Console console = new Console();

      console.title("<-- The Pi4J Project -->", "I2C Scanner");
      console.promptForExit();
      console.println("Vamos a ver...");
      I2CBus i2c = I2CFactory.getInstance(I2CBus.BUS_1);

      // create an I2C device for an individual device on the bus that you want to communicate with
      // in this example we will use the default address for the TSL2561 chip which is 0x39.
      I2CDevice device; // = i2c.getDevice(TSL2561_ADDR);
      String desc;
      for (int i = 0; i<128; i++)
      {
         device = i2c.getDevice(i);

         try {
            device.read();
            desc = "0x" + Integer.toHexString(i);
            console.println(desc);
         }
         catch (Exception e)
         {
            console.println(e.getMessage());
         }
      }
   }
}