Alexa Smart Home Automation system using NodeMCU ESP8266 & Relay Module | IoT Projects

In this IoT project, I have made the Alexa Smart Home Automation system using NodeMCU ESP8266 & Relay Module. You can control lights, fans, and other home appliances with the voice command. I have used only the Amazon Alexa app to connect the Echo Dot smart speaker with the NodeMCU.
JLCPCB Prototype for $2(Any Color): jlcpcb.com
Download PCB Garber file for this NodeMCU project
drive.google.c...
Required Components for this Alexa smart home project
1. NodeMCU or ESP32 board amzn.to/3fJA4EG
2. Relay Module amzn.to/2BQ5Y3o
3. Alexa Echo Dot amzn.to/2PkTOTe
Required Components for Relay Module:
1. Relays 5v (SPDT)
2. BC547 Transistors
3. LED 5mm
4. 220-ohm Resistors
5. Connectors
Download Code for this Alexa Home Automation projects
drive.google.c...
During the video, I have shared the circuit diagram for this Alexa control home automation and also explained the code for this IoT project. This is a very simple home automation project, so you can easily make this smart home device with NodeMCU and Relay module. I have also shown how to set up the Amazon Alexa app for this smart house project. You can control up to 10 home appliances with Alexa.
There is a limitation, the NodeMCU, and the echo dot smart speaker should be connected with the same wifi network.
If you face any issue please let me know in the comment section.
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#Alexa
#SmartHome
#TechStudyCell

[@ArtisanPallet]

Simple but useful home automation project👍👍👍

[@TechStudyCell]

Thanks

[@KWESKOJ]

Thanks a lot mate. i have used several tutorials . not worked but yours . i thanks sooo much. i have subscribed at once.

[@TechStudyCell]

Great 👍

[@hellzlegendz]

Thank you very much, with a little code adjustment and additional wring I have mine set up with an 8-way relay and it works perfect.

[@TechStudyCell]

I have already made an video on Alexa 8 Relays. Please refer this video kzbin.info/www/bejne/mGbco2B-a899d8U

[@partha013]

it is working good but I have some issues when ever power cuts and comes back all device turns on can u tell me the code to turn them default off after every restart.

[@sreeram9220]

Thank you for the video bro I do exactly and it work superbly when ever my nodemcu is reboot or power cut relay state is turn to normal can you do it to remember the previous relay state something like that to turn which ever device is turned on or not

[@Oyuvi]

A big big shout out to Tech StudyCell. Saw a lot of other videos but this is the one that worked.

[@TechStudyCell]

Thanks

[@cadetahnafhasansabuz2735]

Great Brother. Really you are a great teacher.

[@centrodoreforco-aulasderef7743]

Always usefull. Thanks!

[@raajasekard1358]

Thanks for explanation and the code it worked for me. Initially, the devices are not discovered after restarting and trying it again it got detected. :-) :-)

[@ranadheervakkalagadda9925]

Is it working for you brother? I am going to use this code for my project

[@MrMinaAnton]

Nice project, attractive way of explaining thank you, but I have a question, all the Alexa smart home videos with esp8266 focus on direct contact with relay, can you make a video that you change that to UART message to be received by another system (aurduino or microcontroller) that can control larger number of relays and maybe other systems also?

[@electronic7979]

Nice project.

[@TechStudyCell]

Thanks

[@sanu7210]

after uploading your code esp is not connected with my wifi i have cheaked ssid password which i put correct but stile it is not connected with my wifi

[@anujkumar-zt3nz]

beautifully explained...... thank you study cell for making this video... hope 2 see many in future.. :)

[@TechStudyCell]

Thanks for your feedback...

[@Justinzac100]

Extremely helpful video

[@kquiros]

Excellent.

[@prempatel1564]

thanks bro it worked for me

[@TechStudyCell]

Great 👍

[@tonysicily2687]

This is AWESOME, THANK YOU, saved, liked & subscribed

[@TechStudyCell]

Thanks. You may also like our other home Automation project with Alexa. Please visit our channel.

[@tonysicily2687]

@@TechStudyCell Already have, I am loving your channel, you really have helped me decipher this ‘black art’ programming is easy. But knowing nothing, makes learning about IoT very hard as I do not even know what to research. Fantastic, thank you. The NodeMCU is such a great device. Next port of call will be the Nano T-Call for long range projects. Unless you have a better suggestion? 🤔🤔🤞

[@stagpro4032]

my relay is working but there is no light on node mcu and i am not able to connect it on alexa app ?? plzzzzzzzzzzz reply

[@GMDII]

Great video man! thanks a lot!

[@TechStudyCell]

You are welcome

[@3736june]

Thank you

[@TechStudyCell]

Welcome

[@GoogleAccount-rh2ls]

Excellent explantion 👍

[@TechStudyCell]

Thanks

[@ShivamPandey-jc8rh]

great buddy

[@saikatbiswas4402]

Nice

[@TechStudyCell]

Thanks

[@HarshGupta_27]

i am having trouble connecting my lights to relay board please help

[@jorgebarragan6496]

Hello greetings from Mexico. Is it necessary to connect the components (the led or spotlight)? Or is it enough to load it to the nodemcu without connecting the components? Since I load the code, but without component, I look for the devices but my echo dot 3gn has not found them

[@nomiahmad5268]

Did u solve the problem of finding devices. Please let me know. [e-mail]

[@shakerileiwat4341]

Great job ♥♥♥ Should I buy Alexa Echo Dot to do this project or does it work without it (just alexa App) ??

[@TechStudyCell]

Thanks. Please refer this video kzbin.info/www/bejne/iamckp6td9x-ask You don't need echo dot.

[@mschaffer2826]

Great job. How would you add a sensor/digital read to tell the status of an input?

[@alexanderpalomino7193]

i have the same question

[@nouraldinbinkhadra394]

Hello this is amazing thank you very much But I have a question If I need the lamp turn on just for 1 second thin turn of automatically what i can do ((I need a button not switch))

[@tanmaygupta6751]

Bro can you please share a code that works with alexa and Google assistant as well. I use both devices and since ifttt is no longer free my old code doesn't work anymore.

[@rakeshdeb91]

Successfully executed your processes. But one drawback is , when power cut happened, during the time of come back of power, all the bulbs are stared running even you don't want them to run. Could you please suggest any solution!???

[@saadzeshan2720]

Thank you for this Video, This is brilliant. Can you also let me/us know how to inegrate Blynk app to the same code please ?

[@jcwire1685]

Great video, can you tell me if I actually need a echo device to discover the nodemcu. Right now I have a fire tv cube and using the Alexa app on my iPhone and it doesn’t seem to be able to discover it

[@TechStudyCell]

Thanks. Yes, you need an Alexa device like echo dot.

[@jcwire1685]

@@TechStudyCell thanks for getting back to me so quick

[@sumitacookingwithvlog4116]

Nice Project

[@TechStudyCell]

Thanks

[@artcloudns984]

Sir ssid new bnate hai ya hospot hota hai

[@shamimahmed-ux4jy]

Can it control with mobile alexa

[@erikhoffman]

Brilliant! I tried to add another 5 output relays but I couldn't - wonder if you can help I copied everything that include the setting and pasted and changed the values but couldnt as soon as l add after the Serial.begin(115200); it compiles but will not run Help would be great Thanks in advance Erik Hoffman

[@TechStudyCell]

Please refer the following video kzbin.info/www/bejne/hXuXdK2NrreEqJY I have added more features and shown each steps in details. Thank you.

[@adamusgruby4650]

can you describe the rest of the components you saw in the project. For example, what value are the diodes and what are the resistors that are next to the connection block. The resistors that are between the LEDs do not look like 220 because their code starts with black. Can you provide more information or a wiring diagram for this device? Regards. Adam.

[@Blinix2]

Sad thing is that this reset when a power outage occurs, anyone has solved this? A few solutions that I can think are: *use a power bank to power device, and connect that power bank to a usb charger to always have energy. *Use a battery module thingie to power it, same as power bank but gives more options when designing *I believe these devices have onboard persistent storage, but I think it has short life so making some code that has this in mid is important, something like “every hour write the last state of device”, that or storing this last state on a separate server or storage device

[@Doitcreative]

Sir.. can i connect 8 or 16 channel relay ... It can possible to control.... I want to control ten motors using relay by voice commands

[@niteshnahar4724]

Hi, I tried this and it worked well. but can you give some information on electricity consumptions as Im planning to use it in my home for 24x7

[@TechStudyCell]

Power consumption is very low. Less than 1 watt

[@turbo_nasty]

Hello. Thanks for putting this video together. I actually ordered my first custom PCB using your link and the File you provided. It was a lot simpler than I thought and I received the product quickly. I feel more confident in trying my own design. I am having an issue with this project now. It worked for a few weeks now I am getting a “device not responding error” I have tried unplugging everything and plugging it back in. I have removed and reinstalled the devices. Lastly re-uploaded the code. Alexa found the devices and installed them, but right away they are not responding. Any suggestions? Thanks

[@turbo_nasty]

I figured it out. I uploaded the code from my laptop instead of my desktop. I had the latest version of the ESP8266 installed on my laptop. Seems to be working now.

[@TechStudyCell]

Great!! you can also checkout the following Alexa home automation kzbin.info/www/bejne/a169qnZpYqetgqc

[@turbo_nasty]

@@TechStudyCell I will check it out. I think I would like to add buttons. I incorporated a scrolling matrix too.

[@iamrahsal]

Can we control the devices manually by the wall switches along with this?

[@disharanilmini9503]

YOUR CORD all upload done but onther step alexa not working. what is the problem.

[@purushottamdey]

Is it able to control from another network or internet (not same wifi network) through alexa? Obviously nodeMcu will be connected to a fixed alexa device or a mobile which have alexa.

[@rakeshdeb91]

Inbuit option for retaining the same state as before power failure should be used. My humble request to you to help me for this.

[@chiranjibisahoo5408]

Hey buddy can we directly connect google home mini instead of Alexa to Aurdino library as you shown???I dont wanna use blynk app or ifftt etc..

[@SSATechInTelugu]

Sir.. Alexa coading made by you is very good. How can we make manual switch coading in that. Pls send me video. I want Esp8266 code board

[@TechStudyCell]

I will try to cover that in upcoming videos. Thanks.

[@KundanRaha]

your code is working fine. But I have one issue which is when power fails it will not retain last On state, It reset to Off.Kindly update this.

[@PavanKumar-so6sz]

my amazon alexa is not detecting the module. It is showing 'No new devices found." after search completes. How to debug ? Please help me how to fix this.

[@adarshsutariya7987]

supply to relay is from nodemcu???? if yes explain how because it output is 3.3V...

[@feedbackplus1435]

ESP 8266 not reponding to Alexa when use local wifi router, its only work on mobile hotspot

[@rajatkumar2612]

i m gettin no device found on alexa app. what to do. even i unplugged the alexa and plugged it again.

[@chandramohan-zi5bh]

Alexa not detecting node mcu8266, no compilation error

[@ankitrana007]

Hi can you explain why only 10 devices can be connected with Alexa using this method and how to overcome this limitation.

[@enes9602]

Can we check with google home and google assistant?

[@vginside]

Do you need echo device or you can just use alexa app also to connect? Since i dont have echo but trying your code using app it says not device found!! (in serial debug window it shows connected to my wifi). Your reply is appreciated!

[@eladiojovero6412]

I am working with Alexa Home automation and at the time that I am going to install the esp8266 a problem occur. The link prompt that there was an error downloading...I cannot proceed to complete the code and upload it..What is the problem? thank you.

[@akshaydholakiya9460]

how many relay control and add device from alexa? issue only 10 device discovred

[@rupesh0702]

I will try and let you know...

[@TechStudyCell]

Sure

[@pushpendra140]

I have made this home automation system I am not able to find out the devices in alexa can you please help me for my issue

[@ELECTROMOD]

Can we connect multiple ESP32 devices to the same account as shown in the video?

[@arijitchakrabarty8760]

We can control the lights with the alexa app also right??

[@ketul.Malaviya]

Thank you sir

[@TechStudyCell]

Welcome

[@ketul.Malaviya]

Sir Mujhe help chahie

[@ketul.Malaviya]

Sir mera WhatsApp number [phone]

[@ketul.Malaviya]

@@TechStudyCell ?

[@ramanpahwa2845]

For integrating with Alexa, is it necessary to do coding in the firmware itself?

[@aliasgarsarodawala4045]

I using your code for my project but cannot find the device in alexa app......i am just using the app on my phone i dont have smart speaker, but my phone and mcu board is connected with the same wifi. Please help

[@mank6990]

Bhai Problem aa raha he..

[@Maxxhunter556]

You didn't give the all components name

[@crazykid71]

Everything I did as per your Video.but Alexa not detecting any lights. Please help me

[@manmeetsinghKJ]

bhai plz make a project of all in one, like 4 lights & fan with speed slow n fast with push button also

[@harshaldhatkar]

Nodemcu program not sure USB not connected error please solution

[@baaatli]

What if light is already off and I ask alexa to turn off??

[@TechStudyCell]

The light will remain off.

[@imtiazasghar8511]

Bhai tmam lights reverse operate kar rahi turn on bolny par band ho rahi ha or turn off bolny par chal rahi ha ...ye code ma problem ha ya connections ma kindly tell ma

[@GOURAB_DAS_12]

Will this code works without Alexa Smart Speaker... Actually I want the alternative of Blynk

[@sanu7210]

is this same think processible using google assistant

[@Faltuyoutuber5412]

I made it but Alexa aap not add this module I tried many times but it app show no device find . bro solve my problem please

[@disharanilmini9503]

why like this Error: Request upload failed with message: 2 UNKNOWN: exit status 1

[@rajeshkumarj9623]

Hi Tech StudyCell, how to change the wake word like turn on light to open light...

[@aaryansarat4513]

I need your help please help me My alexa is not able to find the devices but before it was able to find and again o got the same issue please help me

[@t.thangtran7334]

hey bro. why i can't use esp 8266 Controlsle for this fan

[@paulpkae]

Many thanks for sharing the code. How can you change the device type to something other than Lights

[@tonysicily2687]

Any mains powered device with work, if connected to the relay in the same way.

[@paulpkae]

@@tonysicily2687 hi yes, I realise that. I was referring to the device type in the Alexa app. They are all device type "Lights". What if I want it to be type "Plug", "Switch", "TV" or "Fan" for example?

[@tonysicily2687]

@@paulpkae ah ok, thanks for clarifying, hopefully some one can help you. The best of luck 👍👍

[@AvdheshSolanki]

I also have the same question

[@edwardsantos5403]

Is there a way to turn off the bulbs trought arduino?

[@beeriotce6768]

Is it necessary to have an Alexa device or just use my phone to search for it? I don't have Alexa, but I tried the Alexa app to find it, but I couldn't find the device set according to the code.

[@TechStudyCell]

For this project you must have an Alexa device. If you don't have any Alexa device then please refer to the following video kzbin.info/www/bejne/iamckp6td9x-ask

[@balaramyadav1920]

Hi Iam not able to see in alexa app any lights or discoverable in the app, NodMCU & my mobile & Alexa echo Show its in the same network

[@TechStudyCell]

Just restart the echo dot, then try again. Please refer this video kzbin.info/www/bejne/hXuXdK2NrreEqJY

[@prateekagarwal9984]

the alexa app is not findin any devices, the wifi is connected on serial monitor, both on the same wifi , still not showing on the app

[@TechStudyCell]

The NodeMCU, echo dot, and Amazon Alexa App should be connected with same WiFi.

[@jamesyahya2897]

👍👍 good.

[@TechStudyCell]

Thanks

[@atreyraikar8784]

I m faceing some problem with alexa and node mcu, alexa is not getting connected can someone help me?

[@abhinandanjain8280]

All relays turn on at boot, is there any way to solve this?

[@anish.g6235]

My nodemcu is executing the code properly when I say the commands the LEDs on the relay module works fine but when I connect external bulb the relays is not getting any signal and the bulb is not turning on but the LEDs on relay module is working fine. What will the problem please help ?

[@TechStudyCell]

Check the continuity across the NO and COM. when the relay turns on the NO and COM should be connected.

[@dipaksonone2917]

Sir Alexa was unable to discover devices.. please help me out.

[@tushthushan5590]

Can't keep the power on and off without resetting?,😇

[@riteshsinha5900]

no echo dot , no sinric pro //// only esp and android with alexa app installed any possibilities ?????

[@TechStudyCell]

Not possible till now

[@ranadheervakkalagadda9925]

i made this project exactly like you said. It's working perfectly but sometimes the devices are not responding. Alexa showing as "Blue bulb unresponsive", "Room Light Unresponsive". Do you have any soulution for this?? or anybody here facing same problem??

[@nouraldinbinkhadra394]

I did everything but when I discover I didn't found any devices

[@francyrussllanto6286]

it also happen to me then I try to turn off first my echo dot and turn on again and tada it found my new device

[@cutekids1760]

Same problem

[@vikrantbhardwaj6779]

Can you share the code please I liked your project

[@TechStudyCell]

You can download the code from description

[@shreedeepgangopadhyay4623]

please check the google drive link of the code. It's not working. I have mailed you for some queries related to the assembled PCB of some of your projects. I want to buy all those PCBs. But first of all please make the drive link available to us. I beg of your help

[@TechStudyCell]

I have checked. The link is working. But still if you face problem please refer the following link. Thank you. www.hackster.io/techstudycell/alexa-home-automation-system-using-nodemcu-relay-module-234617#code You can also refer this video: kzbin.info/www/bejne/hXuXdK2NrreEqJY

[@phmdfly2653]

Can I use an 8 channel board with same set up for controlling 8 bulbs. What would be the changes needed

[@TechStudyCell]

Yes. Please refer this video kzbin.info/www/bejne/mGbco2B-a899d8U

[@sanu7210]

Hiw you get this ok feedbacks from alexa

[@dipaksonone2917]

sir can we add manual buttons to it?

[@edwardsantos5403]

Alexa cant find the device, i checked the serial monitor and it says connected but alexa cant find it

[@TechStudyCell]

Please restart echo dot and try again. Please refer this video kzbin.info/www/bejne/hXuXdK2NrreEqJY

[@Harshu_The_legend]

Bro.2 channel kaam nhi kar rhe hain please help..i followed all steps carefully..