ESP32C3 Permanent MAC Address Change

What’s In This Page

This is a step by step guide that shows you how to change the MAC Address of an ESP32c3 and in a way that the change is permanent.

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The Guide

Open Arduino IDE.

Connect ESP32-C3 to Computer.

Go to Tools.

Tools – Board – ESP32 Arduino – ESP32C3 Dev Module

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Find the Existing MAC Address

Create A new Sketch

Name it Find Existing MAC Address

#include <WiFi.h>
void setuo() {
Serial.begin(115200);
WiFi.mode(WIFI_MODE_STA);

Serial.print(“Original MAC: “);
Serial.println(WiFi.macAddress());
}

void loop() {
}

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Read Current MAC Address

Open Serial Monitor

Read MAC Address that looks like:

Original MAC 7C:DF:A1:12:34:56

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Create A Permanent Custom MAC System

Create A New Sketch

Name the sketch “Change ESP32-c3 MAC Permanently”

This is an example that sets MAC Address for Loco1
It will be upload.

#include <WiFi.h>
#include <Preferences.h>
#include “esp_wifi.h”

Preferences prefs;

unit8_t defaultMAC[6] = {

0x02, 0xAA, 0xBB, 0xCC, 0xDD, 0x01
//change the last term to another Loco number and upload to change to the new MAC address.

};

void loadMAC(unit8_t* mac) {

prefs.begin(“macstore”, true);

if (prefs.isKey(“mac”)} {
prefs.getBytes(“mac”, mac, 6);
} else {
memcpy(mac, defaultMAC, 6);
}

prefs.end();
}

void saveMAC(unit8_t* mac) {

prefs.begin(“macstore”, false);
prefs.putBytes(“mac”, mac, 6);
prefs.end();
}

void setup(){

Serial.begin(115200);
unit8_t mac[6];
loadMAC(mac);
WiFi.mode(WIFI_MODE_STA);

esp_wifi_set_mac(WIFI_IF_STA, mac);
Serial.print(“Active MAC: “);

Serial.printf(“%02X:%02X:%02X:%02X:%02X:%02X\n”,

mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
saveMAC(mac);
}

void loop(){}

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Upload and open the Serial Monitor

The serial monitor should show Active MAC: 02:AA:BB:CC:DD:01

//the last term will show the Mac Address now on the ESP32-c3

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