#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin();
  Serial.println("I2C Scanner - Searching for devices...");

  byte error, address;
  int devicesFound = 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.print(address, HEX);
      Serial.println(" !");
      devicesFound++;
    } else if (error == 4) {
      Serial.print("Unknown error at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.println(address, HEX);
    }
  }
  if (devicesFound == 0)
    Serial.println("No I2C devices found.");
  else
    Serial.println("I2C scan complete.");
}

void loop() {
  // Nothing in loop for this scanner
}