How to quickly confirm the new I2C address after changing toggles or soldering resistors

You can connect the sensor to an Arduino or ESP32 via an address converter and upload the I2C Scanner code below. The serial monitor will output the new I2C address.

/**

@file i2cScanner.ino

@brief The i2c_scanner see if a device did acknowledge to the address.

@copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)

@license The MIT License (MIT)

@author [thdyyl]([email protected])

@version V0.1

@date 2024-08-05

*/

#include <Wire.h>

void setup(){

Wire.begin();

Serial.begin(115200);

Serial.println();

Serial.println("I2C Scanner");

}

void loop(){

uint8_t error, address;

int numDevices;

Serial.println("Scanning...");

numDevices = 0;

for (address = 1; address < 127; address++ ){

// The i2c_scanner uses the return value of the

// Write.endTransmisstion to see if a device

// did acknowledge to the 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(" !");

numDevices++;

}else if (error == 4){

Serial.print("Unknow error at address 0x");

if (address < 16)

Serial.print("0");

Serial.println(address, HEX);

}

}

if (numDevices == 0)

Serial.println("No I2C devices found\n");

else

Serial.println("done\n");

delay(2000); // wait 2 seconds for next scan

}