I2C scanner

scanner.ino

// Robo India Tutorial
// Digital Input and Output on LED
// Hardware: NodeMCU

// scanner. Scanning ...
// 23:13:22.263 -> Found address: 39 (0x27)
// Done.
// 23:13:22.298 -> Found 1 device(s).

// Ref- Nick Gammon  http://www.gammon.com.au/forum/?id=10896
// I2C Scanner

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  while (!Serial) // Waiting for serial connection
  {
  }

  Serial.println ();
  Serial.println ("I2C scanner. Scanning ...");
  byte count = 0;

  Wire.begin();
  for (byte i = 0; 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).");
}  // end of setup

void loop() {}