Smart Home Automation System with multiple ESP32 NodeMCU IoT network with Blynk | IoT Projects 2021

In this internet of things project, I have shown how to make the Smart Home Automation System with multiple ESP32 NodeMCU IoT network with Blynk App. With this home control project, you can control multiple ESP32 and NodeMCUs from a single Blynk account. So you can use different microcontrollers for different rooms, and control them with Blynk App and Switches.
$2 for 1-4 Layer PCBs, Get SMT Coupons: jlcpcb.com/RHS
Download PCB Gerber file for the NodeMCU IoT based home automation project
drive.google.c...
Download PCB Gerber file for the ESP32 control relays
drive.google.c...
During the tutorial video, I have covered the following topics:
00:22 How to control multiple ESP32 and NodeMCUs for different rooms with Blynk & Switches.
02:02 Required Components for this Blynk Home Automation project.
02:28 Circuit diagram of ESP32 Home Automation project
03:23 Circuit diagram of multiple NodeMCU IoT-based Smart Home project.
05:22 How to configure the Blynk App.
06:15 Programming the ESP32 with Arduino IDE
07:43 Programming the ESP8266 NodeMCU with Arduino IDE
09:16 Connect home appliances with the smart relay module.
09:32 Controlling multiple NodeMCU ESP32 control relays from Blynk App.
Required Components for each room for NodeMCU home automation
1. NodeMCU
2. 4-channel 5V SPDT Relay Module
3. Switches
Required Components for each room for ESP32 home automation
1. ESP32 DEVKIT V1
2. 4-channel or 8-channel 5V SPDT Relay Module
3. Switches
Amazon India Affiliate links:
ESP32 DEVKIT: amzn.to/331pohb
NodeMCU : amzn.to/3fJA4EG
4-channel 5V Relay Module : amzn.to/2BQ5Y3o
Amazon United States Affiliate links:
ESP32 DEVKIT: amzn.to/3mBjCch
NodeMCU : amzn.to/2WoR2A2
4-channel 5V Relay Module : amzn.to/3r2HuJ4
Required Components for the NodeMCU control Relay Module PCB:
1. Relays 5v (SPDT) (4 no)
2. BC547 Transistors (4 no)
3. PC817 Optocuplors (4 no)
4. 510-ohm 0.25-watt Resistor (4 no) (R1 -- R4)
5. 1k 0.25-watt Resistors (5 no) (R5 -- R9)
6. LED 5-mm (5 no)
7. 1N4007 Diodes (4 no) (D1 -- D4)
8. Push Buttons (4 no)
9. Terminal Connectors
10. 5V DC supply
Previous video on multiple NodeMCU Blynk Smart Home.
• Home Automation System...
Previous video on programming NodeMCU ESP32 with Arduino IDE
• Programming NodeMCU ES...
Download the code for this Blynk Home Automation system from the following article
iotcircuithub....
**In code, you have to change only the virtual pins according to the NodeMCU or ESP32 numbers.
** You can use different WiFi networks for each NodeMCU, but the Authentication Token should be the same for all the NodeMCUs.
** Don't connect both microcontrollers with the laptop at the same time.
** If ESP32 keeps rebooting after code uploaded then use another power supply.
During the internet of things tutorial video, I have explained all the steps to make this ESP8266 ESP32 home automation system with Blynk to control all the home appliances with and without internet. If the ESP32 or NodeMCU connected with WiFi then you can control the relays from anywhere in the world. And you can also monitor the real-time feedback in the Blynk IoT applications. So with this smart house project, you can convert any appliances to IoT devices and control them through the internet.
#internetofthings #smarthome #Blynk
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[@a.moyewole1425]

Awesome work from Nigeria

[@madmacks]

You have several videos that reference the two custom PCBs you designed. I’ve used your gerbil file and orders 10 PCBs (Thanks for posting the file!). But, it would be nice if you could make a video that walks thru the board circuits and explain the purpose of the diodes, resisters, pin connectors, switches, etc. I can probably deduce their purposes, but your explanation would be more helpful! For example, on the switches, I assume they’re momentary 2 pin but o don’t know the pin spacing. I also not know the purpose of the pins directly above the switches. I assume they are so you can skip the on board switches and use remote switches, but what’s the VCC for? If you explain your design it would be great! Thanks…

[@drelectronics13]

Make no internet only mobile wifi home automation like bluetooth

[@TechStudyCell]

Ok. Noted

[@mohankarunamurthy9739]

Excellent video sir. I have some questions. 1. We are using different micro controllers then How do we select the eps32 and nodemcu in blynk? 2. Can we use mobile network data to control the appliances from outside? Assume that nodemcu connected in WiFi. 3. Can we use this circuit in real time scenario? is that working normally?

[@TechStudyCell]

I have already answered all the questions during the video. Please watch complete video. Then let me know if you have any doubts.

[@mohankarunamurthy9739]

@@TechStudyCell ok thanks. What about 2 and 3 questions?

[@iamvarunverma]

​@@mohankarunamurthy97392.....yes if your nodemcu is connected to wifi u can use it from anywhere on this planet condition is only u have a working internet connection 3.Yes it is working absolutely fine

[@mohankarunamurthy9739]

@@iamvarunverma thank you so much varun

[@lakshminitc]

WoW!!! you've done quite a lot of research on that!!

[@TechStudyCell]

Glad it was helpful!

[@blackhat4817]

super bro........ i love your project

[@TechStudyCell]

Thanks

[@joaorobertobeto6393]

Muito bom seus projetos parabéns gosto muito

[@mohankarunamurthy9739]

Thanks for sharing this video. Can we upload two or three software programs in one ESP? how we can upload two or three software function in one ESP for multiple functioning? for example my first software program is wifi connectivity check and second program for home automation. Is that possible to do multiple software programs?

[@electronic7979]

Nice project

[@TechStudyCell]

Thanks

[@adityaroy4261]

Excellent video Sir

[@TechStudyCell]

Thanks for the feedback

[@Venkatmas]

How to maintain last State after power resume? In iot node mcu project,using extranal eeprom

[@saiots8651]

v v v nice video broh... keep it up

[@TechStudyCell]

Thanks

[@JitenderSingh-cw3nl]

Nice Details 👍😊👍😊😊😊

[@TechStudyCell]

Thanks

[@ajithkumar6105]

The normal switches can be leave as such for normal off/on function and only parallel connection from the switches need to be connected to the relays. what is the need to transfer the normal functions of the switches also to the ESP 32 and relay.

[@tharushasankalpa260]

Excellent Sir, Can we control multiple ESP32 modules with ESP Rainmaker?

[@TechStudyCell]

Yes

[@anandhurajeev4046]

Sir, pls uploade a vedio of home automation, it consists 16 Chanel relay, each realay control manually + IR+ BLINK

[@ABCXYZ-fg8vu]

Can I use the code even if I don't have ESP32 board?

[@GurinderSingh]

Is Mobile connected to card need any other wifi router

[@simbuking2567]

Nice video sir. Please make a fan regulater with esp32

[@TechStudyCell]

Thanks. Fan regulator will take time.

[@vishaljain6130]

please check in nodeMCU switch pin 2 , there is D3, please tell me how can be used. Instead of D3 you should use 0 (GPIO 0). If I used 0 (GPIO 0)than code is not uploaded. You may try. If I upload the code as per you (with D3) than Wi-Fi is not connected. please reply and suggest.

[@mr.anirban6631]

Make one single remote for all those esp boards!

[@TechStudyCell]

Ok.

[@vanshagarwal8894]

Sir when i turn on the manual switches my appliances turn on and off repeatedly. I used the nodemcu code which was there in your website. I suppose that the code is for push button and not for manual switches. So could you please clarify.

[@TechStudyCell]

If you use push button then refer to the previous video. For this video you have to use ON OFF switch. And use separate 5V power supply.

[@vanshagarwal8894]

@@TechStudyCell Now it works flawlessly.

[@shakerileiwat4341]

Awesome ♥

[@TechStudyCell]

Glad you like it

[@matthiash.454]

You have 220 volts AC____bulbs connected to the output of the relay I want to connect WS2812B___ 5 volts DC is this possible ?

[@vinothvinoth-tw2zl]

sir, As per instruction i do all procedure but after upload all relays are ON condition switch operation not working and also blynk operation not working need your support

[@isteevanmangalore9171]

Hi please make video how to interlink two modules operating with switches...I want to control room 2 lights from room 1 controller using switch

[@IfeelWorthy]

Hello sir ! I saw this video and tried making it but there is one problem that the moment the hotspot is disconnected the lights are switching off automatically. Is there any way to resolve that ?

[@pierricdoublet6248]

Super,thanks for sharing. Do you have the same possibility on blynk 2.0?

[@pasinduelectronic1955]

Find a salutation ?

[@angellopezrodriguez3417]

help me ! I only have a router without internet, how can I use mqtt, esp and an apk?

[@iamvarunverma]

u need a raspberry pi and install Home Assistant on it then u can use

[@pookoye]

Is it possible to control esp 8266's relay by pressing esp32's switch? how can achieve this?

[@ravirtech1260]

Please make multiple phone to one nodemcu with it remote home automation

[@TechStudyCell]

Ok. Noted

[@prasannagandre]

You just need to log in on blynk from multiple phones

[@jijithn9501]

is there any way to retain the last state of the relay, after a power failure?

[@r.pranay4486]

Can we connect projector as one of the appliance??

[@shija1999]

Hi Can you please send the BOM and pick and place files for SMT services to use this pcb

[@musaddiqueahmed4662]

Nodemcu not save load last status.. Nodemcu connect to wife all load off....pls reply

[@vinni5497]

Hi how to use esp32 c3 for the same circuit

[@jaywantrawal503]

Nice project. I have tried with Lolin nodmcu it not having SD3 pin (having s3) . this input chanel not working, if peessed nodemcu rebooting. how to overcome this problem

[@thatiotguy8837]

Where did you get the green sheet from?

[@yogeshitaliya473]

Nice one

[@TechStudyCell]

Thanks

[@yogeshitaliya473]

@@TechStudyCell 😍😘

[@user-fo6fp4ob2y]

how u can connect esp32 with switches??

[@josepiva6280]

Olá sempre aço.panho.seus tutoriais neste projeto com blynk daria para adicionar Alexa com comando de voz tbm.

[@anshchawla566]

Bhai ek hi content kitni baar upload karega no hard feelings but ek hi topic par itni sari videos upload karke thode na channel grow hoga

[@skasture9243]

esp32/1.0.3/cores/ sdkEsp32/hardware/esp32/1.0.3/cores/ esp32/Arduino.h:158:12: error: 'std::isinf' has not been declared How can I solve this error

[@maatramathumunnetram1022]

Bro please tell me power cut resume options in r not?

[@arnavkotiyal369]

Bro i need a iot based smart home system where i can perform security attacks and demonstrate how to prevent the system from the threats is it possible or can u help me out i need that project for my dissertation

[@swapnilpanchal1760]

Can you please provide the simulation file for simulating it.

[@rajuraushan4391]

Please Add eeprom to remember last status of device..

[@saiautomations12]

its not working in offline

[@mr.rajeshnamdevshinde4273]

बनाके मिल सकता है क्या

[@vipulpatel7841]

Make video for blynk energy balance.

[@mohankarunamurthy9739]

When i try to order PCb for gerber file which is having more delivery charges (35 dollars) and board cost 7 dollars. How we can order cheap PCB board?

[@TechStudyCell]

Please send email to [e-mail]

[@mrhkmechanical7145]

Sir ye esp32 devki v1 devki v1 kya hota h

[@nimaiadak2563]

Sir pls give me the code of controll home appliences with wifi blink and bluetooth and also ir remote and manual switch by #esp32 And i have a question :- if the esp32 board is connected with a wifi hotspot then i turned off my hotspot then again turn it on but why the esp32 board not connected to the hotspot automatically? If you know the reason and code pls give the code. Thank u sir.

[@joshitoshi9835]

can we control appliances through multiple phones? how many?

[@TechStudyCell]

To control appliances from multiple phones, you have login same Blynk account from all the mobile. No limit for number of mobiles

[@joshitoshi9835]

@@TechStudyCell thats great. thanks

[@pierrezanou6650]

hi, i want to have all the system you make

[@rustamkureshi8246]

bhai, sab kuch theek hai par room me 1 regulater hota to or bhi theek hota kya aap regulater add kr skte hai please project pura ho jyega TECHIESMS sir ne esp32 me fan regulater add kiya tha wesa hi bnalo

[@iamvarunverma]

it wont work well

[@bhimraokamble9931]

Sir please give code for 8 relay...

[@pasinduelectronic1955]

Still working this?

[@amirhayat2799]

]how much does this cost bro?

[@ashaphalthapadev3612]

Namaste sir code link

[@mrhkmechanical7145]

1 alexa device se kitne esp 32 ya node mcu control kr sakte h Sir. Mujhe 3 room and 1 hall control krne h Please help me sir 🙏

[@mrhkmechanical7145]

Hello sir tell me

[@iamvarunverma]

@@mrhkmechanical7145 u can connect as many u want just add room 1 2 3 4

[@mrhkmechanical7145]

@@iamvarunverma Yes Can you tell if 4 esp32 modules can connect to an Alexa application

[@joshitoshi9835]

@@mrhkmechanical7145 do you know what does "connect as many as u want" means?

[@khurramjamal554]

PCB mein relay ki Jo 8 pin h usmein Vcc wali pin ko supply kha say dia

[@TechStudyCell]

Question is not clear to me. Please refer to the circuit shared during the video.

[@khurramjamal554]

@@TechStudyCell Nahi may ya kha Raha hoon Jo vcc wala jumper wire kha Lago JLC PCB may relay ki Jo pins Han us may vcc Ka wire kha Lago

[@iamvarunverma]

​@@khurramjamal554Connect VCC to 5V input + and GND To 5V - (U can use old charger also)

[@boopeshkumarprabhakaran]

Can I control with Alexa and Google too?

[@TechStudyCell]

Will make video on this

[@orangerucksack7083]

@@TechStudyCell Hi , another great video, just ordered 8 relay pcb based on your design from jlcpcb , I would love to be able to control from push button, Alexa and Blynk, look forward to this if you can, many thanks

[@iamvarunverma]

Only Alexa if u want to control it with google u have to buy Pi and install HA on it

[@anshulgupta9893]

Can we manage this with Alexa also?? Pls share code

[@TechStudyCell]

Will make separate video on that.

[@anshulgupta9893]

@@TechStudyCell Dada video will be time taking, can pls upload code before that... So that I can complete my project

[@imdhemant]

Can we sell this projects?

[@TechStudyCell]

Please send email to [e-mail]

[@PrakashDars]

Hello Subhajit, I have sent you an email for business related topic, could we connect and discuss on it. It would be great if you could reply. Regards Prakash