Comments on: Building an ESP32 Web Server: The Complete Guide for Beginners

By: frank

frank — Mon, 04 May 2026 21:41:34 +0000

An excellent presentation, thank you very much. Both web pages worked for me without any glitches, it would only have been easier if somebody had inserted the jumper leads for me!
These ESP32s are fabulous, and very cheap. So much potential it is a challenge to work out just how much can be done with them.
Muito obrigados pelas aulas.

By: Sara Santos

Sara Santos — Sun, 26 Apr 2026 20:41:06 +0000

In reply to Phil.

Hi,
Can you be a little bit more specific?

We have a web server with sliders, but we use the ESPAsyncWebserver library: https://randomnerdtutorials.com/esp32-web-server-slider-pwm/
https://randomnerdtutorials.com/esp32-web-server-websocket-sliders/

Regards,
Sara

By: Phil

Phil — Sun, 26 Apr 2026 18:40:26 +0000

Nice Work on this this webserver design. Do you have an example to read an analog value without a library. Possible setting sliders and meters; Transmit it via https:

By: Sara Santos

Sara Santos — Mon, 23 Mar 2026 16:18:02 +0000

In reply to MORVAN.

Hi.
You have to insert the SSID and password of your network credentials on the code.
Then, after uploading, open the Serial Monitor and then, press the ESP32 RST button, and if it connects successfully to the network, it will print the IP address after a few seconds.
To control a relay, you can take a look at this project: https://randomnerdtutorials.com/esp32-relay-module-ac-web-server/

I hope this helps.
Regards,
Sara

By: MORVAN

MORVAN — Fri, 20 Mar 2026 17:03:44 +0000

Bonjour, Bravo pour ce tutorial ! J’ai réussi après quelques tentatives à charger le code sur mon ESP32 Wroom et à le faire fonctionner bien que je n’arrive pas à afficher dans le moniteur serie le SSID et le PSW, N’arrive pas non plus a afficher l’@ IP, Par contre je peux me connecter directement avec le browser à l’ IP 192.168.4.1 !
Je voulais savoir comment brancher des relais type SSR sur les GPIO’s afin de commander en ON/OFF depuis le browser ? encore merci à vous 2 pour ce BEAU TRAVAIL !

By: Sara Santos

Sara Santos — Sat, 14 Feb 2026 10:22:59 +0000

In reply to Roger Ashley.

That’s great.
I’m glad the issue is solved now.

Let me know if you need further help.

Regards,
Sara

By: Roger Ashley

Roger Ashley — Sat, 14 Feb 2026 08:14:09 +0000

Hi, Sara. A great many thanks.. Overnight I have managed to sort the problem, just have to sort out how to update display readings. Now.. More grey hair.

By: Sara Santos

Sara Santos — Fri, 13 Feb 2026 17:46:01 +0000

In reply to Roger Ashley.

There’s an issue in the Light() function?
How does your Light() function look like? It must return a reading.
Regards,
Sara

By: Roger Ashley

Roger Ashley — Thu, 12 Feb 2026 10:43:01 +0000

In reply to Sara Santos.

I have downloaded code to Pastebin.
The errors I am getting:
C:\Users\roger\AppData\Local\Temp\arduino_modified_sketch_931312\BME280_Server_Light.ino: In function ‘void handleRoot()’:
BME280_Server_Light:54:23: error: invalid use of void expression
54 | html += String(Light());
| ~~~~~^~
exit status 1
invalid use of void expression

Thank You

By: Sara Santos

Sara Santos — Thu, 12 Feb 2026 10:25:48 +0000

In reply to Roger Ashley.

Hi.
In which part of the code are you getting the readings?
Are you currently getting any compilation errors? Which ones?
Can you share your complete code? But, please do so using pastebin (https://pastebin.com/) or Github gist (https://gist.github.com/), for example.
Regards,
Sara