#include <Arduino.h>

// I2C Scanner
// Written by Nick Gammon
// Date: 20th April 2011
/*#undef PIN_WIRE_SDA
#undef PIN_WIRE_SCL
#define PIN_WIRE_SCL D1
#define PIN_WIRE_SDA D2*/
#include <Wire.h>

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

  // Leonardo: wait for serial port to connect
  while (!Serial) 
    {
    }

  Serial.println ();
//#undef SCL
//#undef SDA
  Serial.print("SCL=");Serial.println (SCL);
  Serial.print("SDA=");Serial.println (SDA);
  Serial.print("PWSCL=");Serial.println (PIN_WIRE_SCL);
  Serial.print("PWSDA=");Serial.println (PIN_WIRE_SDA);
  Serial.println ();
  Serial.println ("I2C scanner. Scanning ...");
  byte count = 0;
  
/*#define SCL 5
#define SDA 4*/
  Wire.begin();
  for (byte i = 8; i < 120; i++)
  {
    Wire.beginTransmission (i);
    if (Wire.endTransmission () == 0)
      {
      Serial.print ("Found address: ");
      Serial.print (i, DEC);
      Serial.print (" (0x");
      Serial.print (i, HEX);
      Serial.println (")");
      count++;
      delay (1);  // maybe unneeded?
      } // end of good response
  } // end of for loop
  Serial.println ("Done.");
  Serial.print ("Found ");
  Serial.print (count, DEC);
  Serial.println (" device(s).");
}  // end of setup

void loop() {}