Ton code fonctionne. Je viens de l'essayer. Regarde le câblage de ton bus.
Un code que j'ai fait et qui réalise la même fonction. Avec une présentation du résultat plus pratique.
// Wire Scanner
//
//
// Demonstrates use of the Wire library
// Ping all valid adresses on the I²C bus
// and 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()
{
}