I2C Scanner

/* ---------------------------------------------------------------- /
    // Arduino I2C Scanner
    // Re-writed by Arbi Abdul Jabbaar
    // Using Arduino IDE 1.8.7
    // Using GY-87 module for the target
    // Tested on 10 September 2019
    // This sketch tests the standard 7-bit addresses
    // Devices with higher bit address might not be seen properly.
    / ---------------------------------------------------------------- /
*/
    #include <Wire.h> //include Wire.h library

    void setup()
    {
      Wire.begin(22,21); // Wire communication begin
      Serial.begin(115200); // The baudrate of Serial monitor is set in 9600
      while (!Serial); // Waiting for Serial Monitor
      Serial.println("\nI2C Scanner");
    }

    void loop()
    {
      byte error, address; //variable for error and I2C address
      int nDevices;

      Serial.println("Scanning...");

      nDevices = 0;
      for (address = 1; address < 127; address++ )
      {
        // The i2c_scanner uses the return value of
        // the Write.endTransmisstion to see if
        // a device did acknowledge to the 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("Unknown 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); // wait 5 seconds for the next I2C scan
    }