Projet

Général

Profil

Télécharger (1,52 ko)

Izabela Grubicka » uid_nfc_test.ino

Izabela Grubicka, 17/07/2026 15:46

 
//https://randomnerdtutorials.com/esp32-i2c-communication-arduino-ide/
//https://forum.arduino.cc/t/changing-i2c-address-of-sensors/910535

#include <Wire.h>
void setup() {
Wire.begin();
Serial.begin(115200);
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.println(address,HEX);
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 found\n");
}
else {
Serial.println("done\n");
}
delay(3000);
int error2 = Wire.endTransmission();
if( error2 != 0)
{
Serial.println( "The sensor is not at 0x24");
}
else
{
Serial.println( "The sensor is found, changing I2C address");
Wire.beginTransmission( 0x24);
Wire.write( 0x53); // password register
Wire.write( 0xAA); // password
Wire.endTransmission();

delay(10); // not described somewhere, just for safety

Wire.beginTransmission( 0x24);
Wire.write( 0x00); // I2C address register
Wire.write( 0x50 << 1); // new I2C address
Wire.endTransmission();
}
}
(36-36/44)