esp32 arduino i2c扫描设备程序

`#include <Wire.h> void setup() {   Wire.begin();   Serial.begin(9600);   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.print(address,HEX);       Serial.println("  !");       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 foundn");   else     Serial.println("donen");   delay(5000);           // wait 5 seconds for next scan }`