#include <Wire.h>

void setup() {
  Serial.begin(115200);
  delay(500);

  Serial.println("\nESP32-C3 I2C Scanner (default pins)");

  // Use board-defined default I2C pins
  Wire.begin();
  Wire.setClock(100000);   // slow & safe

  Serial.println("Scanning I2C bus...");
}

void loop() {
  int found = 0;

  for (uint8_t addr = 1; addr < 127; addr++) {
    Wire.beginTransmission(addr);
    uint8_t error = Wire.endTransmission();

    if (error == 0) {
      Serial.printf("✅ Device found at 0x%02X\n", addr);
      found++;
    }
  }

  if (found == 0) {
    Serial.println("❌ No I2C devices found.");
  } else {
    Serial.printf("Total devices found: %d\n", found);
  }

  Serial.println("------------------------------");
  delay(3000);
}