Comments on: ESP32 Relay Module – Control AC Appliances (Web Server)

By: Sara Santos

Sara Santos — Thu, 24 Apr 2025 17:34:05 +0000

Hi.
Did you install the required libraries? Did you install the correct versions?

Which versions do you have installed?

Regards,
Sara

By: Robert Warren

Robert Warren — Thu, 24 Apr 2025 14:58:46 +0000

I get this error when verifying sketch
C:\Users\Administrator\AppData\Local\Temp.arduinoIDE-unsaved2025324-11608-tqtnhf.mwki\sketch_apr24a\sketch_apr24a.ino:121:18: error: no matching function for call to ‘AsyncWebServerRequest::send(int, const char [10], const char [1276], String (&)(const String&))’
121 | request->send(200, “text/html”, index_html, processor);

By: Renato

Renato — Fri, 17 Jan 2025 22:29:40 +0000

Corrigindo,onde se lê NC leia-se NO

By: Renato

Renato — Fri, 17 Jan 2025 22:21:00 +0000

Boa noite. Por favor, preciso de um esclarecimento. Preciso desenvolver no arduino um sketch que, faltando energia AC na fase 1 ligue o Relé da Fase 2 para a fase 1. Mas quando faltar energia na fase 2, o mesmo Relé faça a ligação da fase 1 pra fase 2. Pergunto: se eu ligar a fase 1 no NC e a fase 2 no COM funciona, ou queima o Relé ?

By: Ahmed Samy

Ahmed Samy — Mon, 11 Nov 2024 17:23:58 +0000

I have problem when using GPIO 25 with Wi-Fi the relay stays toggling so fast

By: Roman

Roman — Fri, 01 Nov 2024 21:57:46 +0000

Hello all!

I’ve created a very customisable easy-2-use firmware for ESP32-based relay boards. It has WEB interface, supports MQTT and Home Assistant integration.
You can either use all-in-one relay board (means that MCU and relays are on the same board) or you can connect relays to any board chosen (e.g., ESP32-DevKit).

Check it out here: github.com/rpavlyuk/ESPRelayBoard

By: Matt

Matt — Wed, 15 May 2024 10:51:22 +0000

Hi Sara, first thank you so much for the tutorial.

I’ve bought a 16 relay board with optocouplers, powered on by a 12v separated alimentation.
Then I’ve uploaded your code on my esp32.
My issue is that despite having connected the esp32 nodemcu with a microusb cable to 5v and the vin pin and ground to the relay board pins (vcc and gnd), it doesn’t work at all. The webserver is online, but the relay board seems not to have the right power to work properly.

Have you some suggestions for me please?

By: Aniruddha

Aniruddha — Mon, 08 Apr 2024 10:58:04 +0000

Can I connect a relay module with a weighing scale circuit using ESP32, and whenever I get 3 reading constant the relay should turn off automatically?

By: rod

rod — Fri, 15 Mar 2024 12:46:40 +0000

In reply to Sara Santos.

Hi Sara,
I have bought the 12v coil 8 relay module which I intend using with 12v inputs and switching the relays to give 5v inputs to an Arduino.

The opto circuit appears to be only for 5v so presumably I have to use 5v on GND and VCC but what on IN1 etc 12v + or 12v – ?
And which state will the link be?

By: a s Ali

a s Ali — Mon, 05 Feb 2024 20:13:24 +0000

hi all after pressing rest button i got this massage:
23:00:35.365 -> Connecting to WiFi..
can not get ip address .
any one can help ?
thanks