#include <Wire.h>
void setup(){
    Wire.begin();    
    Serial.begin(9600);
    while (!Serial);
    Serial.println("\nI2C Scanner");
} 
 
void loop(){
    byte error, address;
    int nDevices;
 
    Serial.println("Scanning...");
 
    nDevices = 0;
    for(address = 8; address < 127; address++ ){
        Wire.beginTransmission(address);
        error = Wire.endTransmission();
        if (error == 0){
            Serial.print("I2C device found at address 0x");
            if (address<16)
                Serial.print("0");
            Serial.print(address,HEX);
            Serial.println(" !");
            nDevices++;
        }
        else if (error==4) {
            Serial.print("Unknow error at address 0x");
            if (address<16)
                Serial.print("0");
            Serial.println(address,HEX);
        } 
    }
    if (nDevices == 0)
        Serial.println("No I2C devices found\n");
    else
        Serial.println("done\n");
    delay(5000);
}