Arduino - I2C Scanner

/*

  https://www.cheers2engineering.com/guided-projects/advanced-grades-9-12/arduino-advanced/i2c-scanner

   I2CScanner - to display I2C devices connected Arduino

   Arduino Nano - the SDA (data line) and SCL (clock line) are on the A4 and A5 pin respectively

  */

#include <Wire.h>

 void setup() {

  Wire.begin();

  Serial.begin(9600);

while (!Serial);// wait for serial monitor 

  Serial.println("I2C Scanner");

}

void loop() {

  byte error, address;

  int connectedDevices;

  Serial.println("Scanning...");

  connectedDevices = 0;

  for(address = 1; address < 127; address++ ) {

    Wire.beginTransmission(address);

  // The i2c_scanner uses the return value of

    // the Write.endTransmisstion to see if

    // a device did acknowledge to the address.

    error = Wire.endTransmission();

    if (error == 0) {  //device found

      Serial.print("I2C device found at address 0x");

      if (address<16) {

        Serial.print("0");

      }

      Serial.println(address,HEX);

      connectedDevices++;

    }

    else if (error==4) {

      Serial.print("Unknown error at address 0x");

      if (address<16) {

        Serial.print("0");

      }

      Serial.println(address,HEX);

    }    

  }

  if (connectedDevices == 0) {

    Serial.println("No I2C devices found");

  }

  else {

    Serial.println("done");

  }

  delay(5000);          

}