Arduino Wire Scanner sur le bus I2C

// Wire Scanner
// 
// 
// Demonstrates the use of the Wire library
// Ping all valid adresses on the I²C bus
// and get the answer to see if there is a slave
// Print an 8 x 16 array with the results
 
// Created by fdufnews 2012 december 14th
 
// This example code is in the public domain.
 
#include <Wire.h>
 
void setup()
{
  Wire.begin();         // join i2c bus (address optional for master)
  Serial.begin(9600);   // start serial for output
  Serial.println();     // Print a banner
  Serial.println();
  Serial.println("I2C slave scanner");
  Serial.println("   reserved adress");
  Serial.println(".  no slave detected");
  Serial.println("X  slave detected");
  Serial.println();
  Serial.println();
  int result;
  Serial.println("   0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F");
  // Scan only valid addresses (8 to 0x7B)
  // 0-7 and 7C-7F are reserved ones
  unsigned char devices=0;                  // holds how many devices found
  for (unsigned char ad=0; ad<0x7C;ad++){
    if(ad%16==0){                           // If at start of a row
      Serial.print(ad>>4,HEX);              // Display high order bit address
      Serial.print(" ");
    }
    if (ad>7){                              // skip address from 0 to 7
      Wire.beginTransmission(ad);           // start transmission
      result = Wire.endTransmission();      // end transmission and store answer
      if (!result) devices++;               // add a device to the count if ACK
      Serial.print(" ");
      Serial.print(result==0?"X ":". ");    // If ACK there is a guy at this address
    }
    else{
      Serial.print("   ");                  // Sorry nobody here
    }
    if(ad%16==15) Serial.println();         // end of the row add a new line
  }
  Serial.println();
  Serial.println();
  Serial.println();
  Serial.print(devices, DEC);
  Serial.print(" device");
  Serial.print(devices>1?"s":"");
  Serial.println(" found on the bus");
}
 
void loop()
{
 
}