Board: ESP32 S2 Mini BoardIDE: Arduino IDE 2.2.1
I’m working with an ESP32-S2 Mini (WEMOS S2 mini) , and I’ve been struggling with an issue for the past couple of weeks. Whenever I try to set the Wi-Fi mode to WIFI_AP_STA, the board either reboots or just gets stuck right after printing the first couple of lines in the Serial Monitor.
Here’s the line that causes the problem:
If I comment out this line, the code runs smoothly without any issues.
Also I went through the below post which looks similar to my issue. But it couldn't help.
Hello to every one who is reading this.
(Im sory ahead to everyone english is not my native language, so sorry for bad grammar.)
My nodemcu ESP-32S reboots or resets after getting into the WIFI_AP_STA mode, so please help.
this is my code:
/*
Rui Santos & Sara Santos - Random Nerd Tutorials
Complete project details at https://RandomNerdTutorials.com/esp-now-auto-pairing-esp32-esp8266/
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and asso…
I would be really grateful if anyone could kindly guide me or suggest what I should check or try. Any help, even small hints, would mean a lot.
Thank you in advance for your time and support.
Code:
#include <WiFi.h>
#if !defined( ESP32 )
#error This code is intended to run on the ESP32 platform! Please check your Tools->Board setting.
#endif
#define ERROR_LED 15
#define MAX_CONNECTION 8
/* Set these to station Wifi credentials. */
const char* ap_ssid = "ESP32-S2"; // give Accesspoint SSID, your esp's hotspot name
const char* ap_password = "PASSWORD"; // password of your esp's hotspot
const char* wifiSSID = "MTS_PARADISE"; // SSID of your Router OR mobile hotspot
const char* wifiPW = "9988776677"; // PASSWORD of your Router or Mobile hotspot
//=====Define the IP Address of the hotspot======
IPAddress ip (10, 10, 10, 11);
IPAddress gateway (10, 10, 10, 1);
IPAddress subnet (255, 255, 255, 0);
void setup() {
Serial.begin(9600);//to enable Serial Commmunication with connected esp32 S2 Mini board
while(!Serial);
if(Serial.available()) Serial.readString();
Serial.flush();
pinMode(ERROR_LED, OUTPUT);
Serial.println ("Before WIFI_AP_STA ..1");
Serial.println ("Before WIFI_AP_STA ..2");
delay(5000);
WiFi.mode(WIFI_AP_STA);
}
void loop() {
digitalWrite(ERROR_LED, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(ERROR_LED, LOW); // turn the LED off by making the voltage LOW
delay(500); // wait for half a second
Serial.println ("Hello Wifi.");
}
sonofcy
September 21, 2025, 2:59pm
2
Just a wild hunch, but comment out the 3 lines after Serial.begin(9600); and replace with delay(3000);
sonofcy
September 21, 2025, 3:39pm
4
Try changing to this
WiFi.STA.begin(); // required for ESP32 core 3 to get MAC address ??
WiFi.mode(WIFI_AP_STA);
OR change esp32 boards back to 2.0.17.
sonofcy
September 21, 2025, 3:47pm
5
Sorry, I just tried your code and it works as it should so your board must be damaged. Here is screen shot.
Solution is there is NO problem.
Hi @sonofcy
I’m just wondering—are you also using the same board, the ESP32-S2 Mini (picture attached below)?
Output Log:
Sketch uses 876818 bytes (66%) of program storage space. Maximum is 1310720 bytes.
Global variables use 58016 bytes (17%) of dynamic memory, leaving 269664 bytes for local variables. Maximum is 327680 bytes.
"C:\Users\sahoo\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\5.1.0/esptool.exe" --chip esp32s2 --port "COM3" --baud 921600 --before default-reset --after hard-reset write-flash -z --flash-mode keep --flash-freq keep --flash-size keep 0x1000 "C:\Users\sahoo\AppData\Local\Temp\arduino\sketches\606239953CDC063229AC330A56971643/ESP32-S2-Mini_Wifi_AP-STA_Test.ino.bootloader.bin" 0x8000 "C:\Users\sahoo\AppData\Local\Temp\arduino\sketches\606239953CDC063229AC330A56971643/ESP32-S2-Mini_Wifi_AP-STA_Test.ino.partitions.bin" 0xe000 "C:\Users\sahoo\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.1/tools/partitions/boot_app0.bin" 0x10000 "C:\Users\sahoo\AppData\Local\Temp\arduino\sketches\606239953CDC063229AC330A56971643/ESP32-S2-Mini_Wifi_AP-STA_Test.ino.bin"
esptool v5.1.0
Serial port COM3:
Connecting...
Connected to ESP32-S2 on COM3:
Chip type: ESP32-S2FNR2 (revision v0.0)
Features: Wi-Fi, Single Core, 240MHz, Embedded Flash 4MB, Embedded PSRAM 2MB, ADC and temperature sensor calibration in BLK2 of eFuse V1
Crystal frequency: 40MHz
USB mode: USB-OTG
MAC: 84:f7:03:f2:d9:68
Uploading stub flasher...
Running stub flasher...
Stub flasher running.
Changing baud rate to 921600...
Changed.
Configuring flash size...
Flash will be erased from 0x00001000 to 0x00006fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Flash will be erased from 0x0000e000 to 0x0000ffff...
Flash will be erased from 0x00010000 to 0x000e6fff...
Compressed 21152 bytes to 13549...
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Writing at 0x000062a0 [==============================] 100.0% 13549/13549 bytes...
Wrote 21152 bytes (13549 compressed) at 0x00001000 in 0.4 seconds (421.0 kbit/s).
Hash of data verified.
Compressed 3072 bytes to 146...
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Writing at 0x00008c00 [==============================] 100.0% 146/146 bytes...
Wrote 3072 bytes (146 compressed) at 0x00008000 in 0.1 seconds (340.8 kbit/s).
Hash of data verified.
Compressed 8192 bytes to 47...
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Writing at 0x00010000 [==============================] 100.0% 47/47 bytes...
Wrote 8192 bytes (47 compressed) at 0x0000e000 in 0.1 seconds (560.1 kbit/s).
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A serial exception error occurred: Cannot configure port, something went wrong. Original message: PermissionError(13, 'A device attached to the system is not functioning.', None, 31)
Note: This error originates from pySerial. It is likely not a problem with esptool, but with the hardware connection or drivers.
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html
Wrote 876960 bytes (568127 compressed) at 0x00010000 in 11.7 seconds (602.0 kbit/s).
Hash of data verified.
Hard resetting with a watchdog...
Failed uploading: uploading error: exit status 1
sonofcy
September 21, 2025, 4:59pm
8
No, I am not, never heard of that board. The fact is, the sketch is correct. When a sketch works on one board and not another, it is because you are using the wrong library OR the hardware is bad. What board are you selecting? Once you pick a board try the BOARD examples. I just did and it worked fine. I used
Here is the AP code for that specific board. Try it.
/*
WiFiAccessPoint.ino creates a WiFi access point and provides a web server on it.
Steps:
1. Connect to the access point "yourAp"
2. Point your web browser to http://192.168.4.1/H to turn the LED on or http://192.168.4.1/L to turn it off
OR
Run raw TCP "GET /H" and "GET /L" on PuTTY terminal with 192.168.4.1 as IP address and 80 as port
Created for arduino-esp32 on 04 July, 2018
by Elochukwu Ifediora (fedy0)
*/
#include <WiFi.h>
#include <NetworkClient.h>
#include <WiFiAP.h>
#ifndef LED_BUILTIN
#define LED_BUILTIN 2 // Set the GPIO pin where you connected your test LED or comment this line out if your dev board has a built-in LED
#endif
// Set these to your desired credentials.
const char *ssid = "yourAP";
const char *password = "yourPassword";
NetworkServer server(80);
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
Serial.begin(115200);
Serial.println();
Serial.println("Configuring access point...");
// You can remove the password parameter if you want the AP to be open.
// a valid password must have more than 7 characters
if (!WiFi.softAP(ssid, password)) {
log_e("Soft AP creation failed.");
while (1);
}
IPAddress myIP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(myIP);
server.begin();
Serial.println("Server started");
}
void loop() {
NetworkClient client = server.accept(); // listen for incoming clients
if (client) { // if you get a client,
Serial.println("New Client."); // print a message out the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println();
// the content of the HTTP response follows the header:
client.print("Click <a href=\"/H\">here</a> to turn ON the LED.<br>");
client.print("Click <a href=\"/L\">here</a> to turn OFF the LED.<br>");
// The HTTP response ends with another blank line:
client.println();
// break out of the while loop:
break;
} else { // if you got a newline, then clear currentLine:
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
// Check to see if the client request was "GET /H" or "GET /L":
if (currentLine.endsWith("GET /H")) {
digitalWrite(LED_BUILTIN, HIGH); // GET /H turns the LED on
}
if (currentLine.endsWith("GET /L")) {
digitalWrite(LED_BUILTIN, LOW); // GET /L turns the LED off
}
}
}
// close the connection:
client.stop();
Serial.println("Client Disconnected.");
}
}
Your board is ESP32 , while my board is ESP32 S2 (Wemos S2 Mini) .
The sketch works perfectly on the ESP32 board, but unfortunately, it does not work on the ESP32 S2 .
Over the past few days, I have revisited this issue and searched extensively online.
I will still try a few more approaches. If that does not help, I may have to shift to another board, as continuing with this one may not be practical.
Thank you @sonofcy for your time and guidance.
I heard from a friend that if you short pin EN and 3.3v with a 10k ohm rezistor or a coin it could solve the problem but use it as last ditch efort (it could do iversible damage and i have never tried it) also i would check connections on the board, but keep in mind that im no expert.
Wish you luck
