0ESP32-lab

I2C Scanner

C++
#include <Wire.h>

void setup() {
  Wire.begin(); // สำหรับ XIAO โค้ดนี้จะไปเปิด I2C ที่ขา D4, D5 อัตโนมัติ
  Serial.begin(115200);
  while (!Serial); // รอจนกว่าจะเปิด Serial Monitor
  
  Serial.println("\nI2C Scanner");
}

void loop() {
  byte error, address;
  int nDevices;
  Serial.println("Scanning...");
  nDevices = 0;
  
  for(address = 1; address < 127; address++ ) {
    // ลองส่งข้อมูลไปที่ address นั้นๆ
    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("  !");
      nDevices++;
    }
    else if (error == 4) {
      Serial.print("Unknown 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);
}

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