View source for ESP32: I2C Scanner

 /*********

   I2C Device ESP32
   SDA        SDA (default is GPIO 21)
   SCL        SCL (default is GPIO 22)
   GND        GND
   VCC        usually 3.3V or 5V

   Rui Santos
   Complete project details at https://randomnerdtutorials.com  
 *********/
 
 #include <Wire.h>
  
 void setup() {
   Wire.begin();
   Serial.begin(115200);
   Serial.println("\nI2C Scanner");
 }
  
 void loop() {
   byte error, address;
   int nDevices;
   Serial.println("Scanning...");
   nDevices = 0;
   for(address = 1; 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.println(address,HEX);
       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);          
 }