某宝上的配件，虽然很便宜，但很多都不提供资料！如果给的资料有错的，则更浪费调试时间。

下面的代码用于扫描I2C设备地址

Serial.begin (9600);

// wait for serial port to connect
while (!Serial) {
}
    
Serial.println ();
Serial.println ("I2C scanner. Scanning ...");
byte count = 0;
  
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).");