ESP32/ESP8266 Relay Module - Control AC Appliances (Web Server)

ESP32 Project (schematics + source code) ► RandomNerdTuto...
ESP8266 Project (schematics + source code) ► RandomNerdTuto...
Using a relay with the ESP32 is a great way to control AC household appliances remotely. This tutorial explains how to control a relay module with the ESP32. We'll take a look at how a relay module works, how to connect the relay to the ESP32 and build a web server to control a relay remotely (or as many relays as you want).
SAFETY WARNING: in this example, we’re dealing with mains voltage. Misuse can result in serious injuries. If you’re not familiar with mains voltage ask someone who is to help you out. While programming the ESP or wiring your circuit make sure everything is disconnected from mains voltage.
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[@RuiSantosdotme]

You can find on my blog the full step-by-step instructions for each ESP board. ESP32 Project (schematics + source code) ► RandomNerdTutorials.com/esp32-relay-module-ac-web-server/ ESP8266 Project (schematics + source code) ► RandomNerdTutorials.com/esp8266-relay-module-ac-web-server/

[@ingenierocristian]

Rui Santos Hi, I bought your ESP32 course, it turns out that I need to send digital values from 16 GPIOS, and send them to a platform called Ubidots, but I still don’t know how can I doit, can you please help me about?

[@RuiSantosdotme]

@@ingenierocristian hello, unfortunately I've never used that platform before. Have you tried their sample projects from the library? Thanks!

[@ingenierocristian]

@@RuiSantosdotme Ubidots is quite similar to the project you made in the Module 7 of your course, except this platform integrate its broker, it uses the MQTT protocol

[@RuiSantosdotme]

@@ingenierocristian I think they have a library with a bunch of examples that show how to use the platform. Did you try their library examples? You can also use any MQTT example (instead of using an IP address, you use their domain name, then check which topics you need to subscribe to)

[@MrSpock-sm3dd]

This is the third project I'm trying. Yours was the only one who works. Thank you a lot my friend, hugs from Brazil

[@RuiSantosdotme]

Thank you for your kind words, I'm glad it was helpful. Greetings from Portugal, Rui

[@ldt_]

This is great... you are great... where the hell was this video 8 months ago when I needed you? lol. Good work!

[@RuiSantosdotme]

Thanks!

[@ldt_]

@@RuiSantosdotme Hey, so going through your posted project, do you have any recommendations for setting this up and accessing the ESP without port forwarding on the firewall? Something like a websocket server/client with an Android app? Thanks

[@CreativeDesk]

Your video is always so clear and also your website .all the necessary things are present in website Keep posting ...

[@RuiSantosdotme]

Thanks! I'm glad you found it helpful

[@jtrain1653]

Thank you so much for sharing this wonderful video!It means alot to show and educate people who are trying to do gadgets like these.

[@muneebbutt7101]

i have watched a lot of videos about home automation using esp 8266 but nothing worked . but to my surprise, this time it worked . means a lot bro

[@edsonferraz1]

Congratulations Rui!! Great solution, thanks so much.

[@pelouis9413]

Thank you my friend by your project ,Im come from Vietnam.

[@edsonferraz1]

Congratulation Rui!! Great solution. Thanks so much.

[@Banjoba]

Clear and concise. Great video. Thanks.

[@walterr8115]

Thank you😃, i was wondering why it doesn't work, then i realize the jumper caps were removed!

[@cizainnocent8392]

Very nice video. It worked perfectly when I repeated it. Could do you please improve it by making it accessible from anywhere over the internet? thx

[@3DprintRC]

simple and usefully video.thanks.

[@elektron2kim666]

I need to do this at some point. My solar setup (tiny 12 volt batteries) must be off at night (draining from the controller, mostly) and my sister got some ideas where she lives.

[@societateanationala6207]

Took me 10 mins ... Thx

[@jag_3d]

Hey great video! I got a question, do I have to find a 3.3v relay for using in with my ESP32? or what is the model youre using in this video? Thanks, I apreciate your work!

[@WPGinfo]

Thank you. This was very useful!

[@RoMecha_lb]

Great tutorial dear

[@kaiomatico]

Wow now that is really awesome and clean code! Thank you so much:)

[@RuiSantosdotme]

You're welcome! thanks for watching

[@Leo-db6mi]

really good stuff keep it up

[@chubbyvery1339]

Hi, Followed your video and it works. The problem I encounter is that when I open my motor, I need to close it before I can open other device. I believe they should work simultaenously. Whats wrong with my circuit?

[@BootlegEL]

Thanx this was helpful

[@dons3357]

Thank you. Helpful as always.

[@RuiSantosdotme]

Thanks!

[@andys6]

This is great! thank you

[@2ds.service200]

A good work. Really i like

[@bossdonalan6840]

Good explanation

[@RuiSantosdotme]

Thanks!

[@sameneko8979]

Thank you for the video sir.

[@kamalambrator4332]

nice presentation! thank you

[@RuiSantosdotme]

You're welcome!

[@mojtaba3296]

fantastic!!

[@gurunanjaiahkembhavimath8728]

Good video

[@NuMwhan-bg4fq]

when connecting my 4 channel module to the gnd and 5V pins of my esp32wroom32u wifi disconnects and can't access webpage (I made my own) What could be the issue? the module is taking too much energy?

[@user-dm8sm3gw5o]

Hello and thanks for this beautiful video. Can you tell me how to connect to this Esp32 from WEB and not only from same network??

[@yoursinger4014]

You can use Firebase or any sort of database. Connect it to your Esp32 , make an android or IOS app.. and you are done! There are plenty of videos on how to connect Esp32 with Firebase. Hope it helps!

[@Circuitsplanet]

Excellent

[@jumbo999614]

Is this tutorial for RELAY with active LOW? Mine is active low. Can you also explain the code? the lines with code: request->send_P(200, "text/html", index_html, processor); The function: String processor(const String& var) { .....} I thought you have to pass argument into processor function on "request->send...."

[@treeyuono9372]

Thank u....Rui...

[@bishop34644]

Great job if I wanted to only be able to have one really on at a time example if I have four relays and I turn on number one then I turn on number two in the code how would I have it so when you switch relays it auto shuts off pervious one

[@GurinderSingh]

Is internet connection or wi fi compulsory with this module can I use this module for switch on off with mobile directly

[@Luismaia00]

Very nice , let´s say as is 5 relay, each controled by each button now how to add a button to turn off/on all at the same time,the idea is that leaving house and turn OFF all ligths or getting home turn on ligths ON, is it possible ?

[@danielapetroaie8217]

when i run the code i don't get any error but nothing shows up on the serial port i pressed the rst button why?

[@user-xe5fg8yy3l]

i know it is long time this video was relased but i tried it and is wdt reseting can somebodz help me????

[@elpetitcafe5385]

Hi Rui, I though you need 5v to move the coil of the relay, are the 3v of a nodemcu enough to control relay? Or do you use an extra power source to make it work?

[@adrianshawuk]

Elpetit Cafe I had to buy 3v relays as my esp32 couldn't supply enough to use the 5v one I was using with my Arduino that ran on 5v

[@sukasa9374]

I see this tutorial only control 5 chanel ? Can this device use 8 chanel ?

[@rishujain21]

Hi Rui, Thank you for this fantastic video. Is there a limit to the number of Channels which can be controlled using a single 8266 NodeMCU component?

[@CharDhue]

I use this relay module but the relay won't change even thou the led change with 3.3v from nodemcu

[@raffaelebarlotti9017]

Hi, great project! I need to use all 8 channels with ESP8266 could you tell me which pins to connect the remaining 3 channels to? Thank you.

[@sonupradeep1996]

how to acces the node mcu from external network...do we have to perform things like port forwarding to acces the same throuh the internet

[@danielwarnock4157]

I followed your tutorial and built a similar project Thank You it was a fun build! is there a way to name the relays independently in the web server? I have them performing specific functions and I'd rather them have a name other than Relay #1 - GPIO 16 etc... I'd really appreciate your help

[@abur9976]

una pregunta, estoy estoy trabajando en un proyecto para automatizar el reguio de un cultivo por bonbas de agua, el control de la automatización se hara mediante una aplicacion wed, tengo un modulo esp8266 y un rele de dos canales, la pregunta es a pesar que el rele dice que solo soporta 10-15A Y 125 VAC - 250VAC, no hay problema si lo utilizo para una bomba de agua de 110 vcc?

[@eldaelda4991]

How reverse the output, Relay 16 channel have positif input.

[@shandradm911]

how to make if turn off relay 1 turn on relay 2?

[@user-dl3hj3cw9o]

Отличный проект. Можно ли добавить простой таймер, например после движения ползунком влючается реле, а через 5 сек. отключается и ползунок возвращается в состояние выкл.

[@technotricks7627]

Sir i need, auto on relay when connected to wifi can u help me? M a beginner

[@NEWBI3GAM1NG]

nice video.. but anyway i have a little question about how to change the credentials without hard coding again.. thanks in advance..

[@sanmeetsingh8219]

hi i like your video , but i have question that, i am using esp 32 for my rgb lights {wled} and i also want that esp board to turn off things that i link in this video, so plzz tell me can i makeor run 2 commands always on a single esp board u can also make video on that

[@christiangenebrozo2126]

Good video, i have a problem my relé module needs 5v and the esp8266 just send 3.3v and it doesn't work please help, thanks a lot

[@Circuitsplanet]

Is there anyway to control it through internet is????? Plzzzz

[@hussienmohamed2589]

Could I use the same project to control more than one home light bulb? Or I need to buy 8 channel relay module to control all the ceiling light bulbs in my room? "I mean the main voltage home light bulbs not the external light bulbs". Thank you.

[@Eduardo-ro4bv]

Thanks for your video dude. I have a question? If I need a relay that can handle a 48VDC out with 6A. Can i connect to 2 relay that give 30VDC and 10A each to control only this 1 equipment?

[@blukobalto]

I have an esp and i want to monitor the lights of an electromechanical pump's control box. The lights are 24v ac i need to read their status on or off with the esp is it possible to read the relays status with this module?

[@valdirturquettes8715]

Olá ! Amigo Seus videos são bons Faca em português , que vc vai ter muitos seguidores no aqui no Brasil ATt

[@DeepRoy4600]

Vou testar isso assim que tiver tempo. Serias capaz de me tirar umas dúvidas?

[@carloselmano6725]

Olá Rui. Parabéns pelo video e pelo canal. Gostava de saber se é possivel fazer o seguinte: ter o som ambiente por zonas com botão no Home assistant... será que é possível com esp 8266 ou wemos Com relé E adicionar o sistema ao HA com botões? Tipo - ligo o sistema de som e as colunas estão todas ligadas - se ligar o botão 1 toca na sala - se ligar o botão 2 toca no WC se ligar os 2 tocam em ambos os espaços. Obrigado

[@AshiqurRahman]

Is the relay module 3.3v or 5 v

[@katopavla]

5v

[@quickfixengineeringltd8035]

I have a hosted domain. How do I make this project controlled over WiFi not with a local network

[@mekszii]

Hello! if I want to supplement it with a LoRa module due to the longer range, what should i do?

[@vishwambharjoshi4317]

Hay we are using it by Wifi, but can we use it by Manually + Bluetooth enabled........if Yes, then what will be the circuit diagram and codes?

[@danisxatzi6282]

Hello!! What if i want when i sent the command to close the relay, it will close in one or 2 sec it self? Thanks!!

[@guilhermepaixao1102]

Exelente.obrigado pour partilhar.Bom ano!

[@RuiSantosdotme]

Obrigado! Abraço!

[@ingenierocristian]

Hi, I need to make an I2C communication between an Esp 32 and Esp8266, where can I find info about?

[@enriqueolmeda1]

Hi Rui, ESPAsyncWebServer is not available... What can I do? Could it be that it does not exist anymore?

[@titsik]

you are genios

[@SciHeartJourney]

I'm finding it hard to work with Arduino. The LIBRARIES always change or disappear, to the code that's shown in this video won't work. I cannot find the libararies ESPAsyncWebServer, ESPAsyncTCP, or AsyncTCP. I've found files in Github, but I can't get Arduino to recognize these libary files. Nothing seems to compile and it's just pure frustration.

[@SciHeartJourney]

Ah, I found my mistake! I went to your website (first link) and followed the library installation instructions. I was using Arduino 2.0.2, which I see we should not be using. I've got the recommended legacy version loaded now. Still I had problems with the libraries, until I read more carefully. When I unzipped the file, it creates a subdirectory with the actual folder that needs to be renamed and put in the /libraries directory where Arduino expects it. The code compiled now! Thank you for the hard work on your website.

[@vojtasmolik3547]

Hi Rui don't you want to make weather station based on your ESP-32 weather shield with another wirelessly connected another shield that one will be inside and one outside that will be shown on display and on internet and maybe solar powered i think that would be awesome sorry for my poor english keep what are you doing and happy holidays!

[@mikepatton9684]

and webserver with espalexa?

[@sandorfarkas7193]

Hello. do you have any idea how it can work with xlights with an esp32 16 channel relay?

[@christiangenebrozo2126]

Hi good video, could you tell me how did you do the app to your celphone, thanks a lot

[@dkeinys]

Hi Can you please create version of this script that allows to control relays based on Temp & Humidity??

[@hummingbird2520]

Can we Controll led output of 1 volt

[@Dean.Michael.Winchester]

What if I want to control the relays using blynk?

[@0124akash]

This project based on local area network or global ?

[@enriquebartolini6161]

Do you need an ip pubblic? Thanks

[@evilmode100]

Hi how to name each gpio? as Relay #4 renamed to garage?

[@hanslubbe9702]

Hi Rui, Just came across this video, i must say very well done, nice clean code and awesome explanation !! i do have a question though, i would like to name the relays, i don't want to see the "Relay#1 - GPIO 14" text, can you please update the esp8266 sketch?

[@hanslubbe9702]

Hey Rui, don't worry, i got it working the way i want to :) Still, thank you for your great video, it helped me a lot!!

[@magicianofelectronics951]

Compiling error for ESP8266, Wemos D1 R1 mini, Thank you

[@Dancopymus]

Hi Rui, Greetings from Brazil! I have two questions: 1) I have a Module with 8x Relays, but it works with 12V, so how should I connect it to ESP32/ESP8266? I know I must use External Power, but how do I make the connections? 2) And that JDVcc jumper I don't understand what it's for. Thanks

[@AshiqurRahman]

I have NODE MCU esp 32 wroom devkitv1 . It has no 5v output. (Only one 3.3v output) if I connect relay module eith external 5v power source and connect only the data pin with ESP 32 board, will my relay work? Will the ESP32 burn? I understand that the above question can be answered if I knew 1. Relay connected with just an external power source (no pins even data is connected with esp 32 board). What is the voltage reading of data pin of relay? [ I believe it should be 0, since this is just a triggerer] 2. Now I have connected relay module's data pin with ESP32's any data pin and relay's power is again given from external source. Will the ESP32 be able to trigger relay now? Please answer I am having hard times.

[@patrickmclaughlin6013]

I think you can use an external power supply for the relays and just use the esp8266 to trigger them see 2:34 for the jumper but that could be specific to the relay board you have, the one I have does not have the external power supply jumper

[@gurumurthykola8520]

Hi Rui, The tutorial is nice. i have tried using the information provided in your tutorial. Able to control the relays only when my ESP8266 and Laptop (where i am opening the web page to control the relays) are connected to same network. If both are connected to same Wifi network, the ip address is not opening. What might be the issue? Do you have any inputs?

[@mr3748]

Good day Mr Santos, thank you for your videos, Ive learned a lot from all of them. I was wondering if you could help me regarding relays... So I have a simple webserver where I can turn a relay on/off and I have three LDR sensors as inputs for the three status LED of the water pump I want to control. Ive used the meta-refresh to refresh my web server every 30s, BUT once the server refreshes, my relay quickly turn off and back on again during the reset. Is this one of issues related with using meta-refresh or does this sound like bad coding? EDIT: I fixed it within an hour of typing this message, Ive connected the relay to GPIO2 but I was so focused on my coding and other stuff that Ive failed to remember that the buildin LED is also controlled from GPIO2. Luckily this is an easy fix. Ive used the buildin LED to give me wifi status updates as well as data coming from the client, that is why my relay went mad. Ill leave this comment to help others.

[@exmexh4713]

Hello. Can I control 24V relay with 3.3V(12mA) output GPIO? So using ohms law i need 2k ohms to get 24V. Will this work?

[@h.p.8379]

Thanks for the video. I see use 2 skits for ESP8266 and ESP32. Couldn't you combine both sketches and just use the sketch for both ESP (8266 and 32)? You would then only have one sketch, which then works for both ESPs.

[@RuiSantosdotme]

The examples demonstrated in this video work for both boards, if you notice I use a condition to include the proper WiFi library if you're using the ESP32 or ESP8266 (time of video 4:42 and lines 7-12 ). I hope that helps!

[@christianrojano6470]

Good Day Sir!, In my current project I am combining your codes for the dht22 and relay. I encountered a problem and it says "relayState is not declared in this scope"...can I ask sir why is that?

[@prakharverma2286]

put this at the starting of the code: String relayState(int i);

[@RajatGupta_Pune]

@rui Santos : can you help me with code in your Relay code, to have the Internal LED of ESP8266 Blinking while the WIFI is being Connected, and stays ON once connected to wifi, Unable to be sure if it was connected or not if not connected to computer.

[@MFORMAAZ]

Can I control 1 phase AC motor

[@linkmaticelectronicspakist4693]

Very good video but one thing is lacking that there should be relay status reply in front of each switch so we can know that this relay is actually ON or OFF . Because in this code when we disconnect ESP even then the web page works and we can turn switches ON and OFF however it is actually not turning switches ON OFF.Kindly make little changes and add status reply code i know it is not a big deal for you and it will take little time edit it but it will help many people around the world.Waiting for your reply ...Thanks

[@Circuitsplanet]

But what about esp 01??

[@bhaskerreddy9054]

Is this can be controlled from anywhere in the world

[@naufal9104]

rui, how to post data without refreshing the page?

[@Santiter]

Hi ! First of all thank you very much for all your tutorial and content ! Thanks a lot !! I have a question: I'm starting to program an ESP32, and what I want to do is to use data that I wan’t to input through an internal html site, exactly as you do in one of your tutorials using the ESPAsyncWebServer Library, and at the same time I need to be able to auto connect the device without hardcoding the Password and Name of the net, so I can do it more “plug and play” Where should I start studying? Is there a way of combining both libraries, or some of those features are also possible to make in both libraries? Thanks a lot !!

[@saeedbaloch2]

that's exactly what I am looking for too, I hope he replies back to this.

[@Kunal_Joshi]

Hi Rui, is there a way to do the same using softAP.

[@code_music]

Nice guide. My only problem is that my relay has chinese language