Comments on: ESP32 Web Server – Arduino IDE

By: Sara Santos

Sara Santos — Thu, 19 Mar 2026 13:17:23 +0000

In reply to Jim.

Hi.
It depends on the board.
In our case, that pin is not used by PSRAM, so we can use it as an output.
In other boards, it might be different, and you might need to select a different pin.

Regards,
Sara

By: Jim

Jim — Wed, 18 Mar 2026 17:10:58 +0000

In reply to Edwin Espin. This is on a EPS32-C5 dev board.

By: Jim

Jim — Wed, 18 Mar 2026 17:09:45 +0000

In reply to Edwin Espin. I have similar issue. GPIO27 is used for PSRAM. I'm going to try to use another pin.

By: saad-abdo

saad-abdo — Sat, 03 Jan 2026 16:54:20 +0000

thanks for your time

By: galina

galina — Sun, 03 Aug 2025 01:10:05 +0000

Hi Sara
It is possible to add this code – 1khz generator, and send this signal to iPhone speaker when LED is on ?
#include
void setup() {
// No setup needed for tone() function itself
}

void loop() {

tone(26, 1000); // tone on pin 26
delay(5); // Delay to hear the tone

}

By: Sara Santos

Sara Santos — Mon, 07 Jul 2025 09:20:02 +0000

In reply to John Page.

Hi.
I recommend following this tutorial now instead: https://randomnerdtutorials.com/esp32-web-server-beginners-guide/
The code is better optimized.

Regards,
Sara

By: John Page

John Page — Sat, 05 Jul 2025 22:11:22 +0000

Thank you! Very useful. I notice from the Serial port log that when a request is processed there is a slight delay, then it seems to get a new client again and then disconnect it. Why does that happen? I only click the button once.

By: Michael

Michael — Thu, 22 May 2025 20:53:02 +0000

hi Sara, I have question about the two button example. I created 10 buttons and when I click on the lowest one, I want that the next page goes down to last button I had clicked on, via html anchor or something. The problem with anchors is that they are not visible in the header via GET like below and so IndexOf can’t find #test1 . Do you have an idea how to fix this? Thanks in advance.

test1

New Client.
GET / HTTP/1.1
…

By: Sara Santos

Sara Santos — Thu, 22 May 2025 08:39:39 +0000

In reply to Chuck.

Hi.
Thanks for your feedback.
Currently, I recommend following this updated version of the tutorial instead: https://randomnerdtutorials.com/esp32-web-server-beginners-guide/

Regards,
Sara

By: Chuck

Chuck — Wed, 21 May 2025 16:01:51 +0000

Hello, this tutorial did not work for me out of the box. It would just say “connecting to (SSID)……..” forever. I found in another of your tutorials (https://randomnerdtutorials.com/esp32-useful-wi-fi-functions-arduino/):

“If the ESP32 will connected to another network (access point/hotspot) it must be in station mode.

WiFi.mode(WIFI_STA);”

I added this on line 46 and now it works.

Old:
Serial.print(“Connecting to “);
Serial.println(ssid);
WiFi.begin(ssid, password);

New:
Serial.print(“Connecting to “);
Serial.println(ssid);
WiFi.mode(WIFI_STA); //This was not in the tutorial but is necessary for the ESP32 to connect.
WiFi.begin(ssid, password);

Maybe because I am using ESP32-WROOM-32 and this is for an older or different module? I’m not sure.

Anyway, thank you so much for providing this example, and for your other tutorials! Your work has made my work so much easier!