Smart Home with Google Assistant & Alexa using NodeMCU ESP8266 (Manual + Voice) | IoT Projects 2021

In this IoT projects, I have shown you how to make the smart home with Google Assistant & Alexa using NodeMCU ESP8266 to control relays with voice commands and manual switches. I have used all the free tools for this IoT-based home automation system.

Download PCB Gerber file for this NodeMCU IoT based home automation project

During the tutorial video, I have covered the following topics:
00:22 Control appliances with Google Assistant and Alexa using NodeMCU
01:11 Control appliances manually with switches.
02:36 Required Components for this NodeMCU project.
02:49 Circuit diagram of NodeMCU home automation project.
04:07 How to create and configure Sinric Pro account.
05:37 Program NodeMCU with Arduino IDE
07:37 Setup Amazon Alexa App to add IoT devices.
08:41 Setup Google Home App to control NodeMCU with Google Assistant.
09:46 Control relays with voice using Google Assistant

Required Components for each room for this NodeMCU home automation
1. NodeMCU
2. 4-channel 5V SPDT Relay Module
3. Switches or Push Buttons

Amazon India Affiliate links:

Amazon United States Affiliate links:

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

**Here I can control all 4 relays manually with switches. But as I have used the free Sinric Pro account, so I can control 3 devices with Google Assistant and Alexa. To control the fourth device, you have to purchase 1 device in Sinric Pro.

**If you use Switch, then the Switch-2 must be turned off during the booting process of NodeMCU. But for push-button, there is no such limitation.

**You don't need any Alexa devices like Echo Dot or Google Home Mini. You can just use Google Home App and Alexa App for this IoT project.

Download Code for this NodeMCU smart house automation project from the following article

During the internet of things tutorial video, I have explained all the steps to make this NodeMCU ESP8266 smart home system with Sinric Pro to control the home appliances with and without internet. I have made this Google Assistant control smart home system without IFTTT. If the NodeMCU connected with WiFi then you can control the relays from anywhere in the world with Alexa and Google Assistant. And you can also monitor the real-time feedback in the Amazon Alexa and Google Home IoT applications. So with this smart house project, you can convert any appliance to IoT devices and control them through the internet.

So, now you can just ask Google Assistant, "Hey Google, turn off lights", or "Alexa, turn on light". that's it.

#internetofthings #homeautomation #googleassistant
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Other useful Internet of things projects:

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Latest ESP32 projects playlist:

ESP32 Smart Home System with Amazon Alexa app & Manual Switches

Alexa Home Automation project using NodeMCU

[TechStudyCell]

⚠️ This video took a long time to make if you would like to buy me a coffee to say thanks, link below: ☕

[timlytle]

Dude! Thanks for turning on all the lights in my house less than 5 minutes into your video!😂

[sohamkulkarni]

Please Give detailed information about how to download all the libraries of Arduino ide and sinric pro

[obedriverarazo]

To connect more lamps you need a hub or server, por example the program home assitant in raspberry pi, and the custom firmware tasmota, and devices with esp8266 like sonoff to control outputs for control infinite lamps

[HRTechnologyProR]

Thank u brother for making this video . ❤

[sivaphysio]

Excellent work bro super pentastic, and congratulations bro

[gauravganguly]

Your videos are an awesome treat !!!❤️

[hobbycollector]

Works like a charm! Thanks for the video, it help me a lot!

[Diamond-Daga]

Thank you for making such awesome videos, if possible please help making a combined circuit with light and fan controller as it will be really helpful

[fredmunyao]

Thanks very much. This works for me. Continue with the good work

[condriya]

Bro … in a ideal mode nodemcu is disconnecting and connecting automatically… please give e solution

[arghyaghosh]

The problem with your design is that the physical switch state wont change if you turn on from switch and turn off from alexa. It would be better to use push or touch buttons here. You van also try adding in a raspberry pi with home assistant to add a cluster of such nodemcu subsystem in the entire house

[Pendu_music_.]

Bro cp2102 ke liye driver install kese kare pc win7 32bit

[noelmorona]

Nice tutorial but is there any diagram for 8 to 16 lines or what is the max line that NODE MCU can handle? Thank you for the response

[omegamix]

شكرا لك على كل المجهودات المبذولة thanks a lot my friend

[dinesh_electronics_lover]

Hi sir how are you I am a new viewer for your channel this project is very useful to me but the on and off comant in change
ON comant light is OFF
OFF comant light is ON

[johnkiran]

I'm also working on IOT project,
Here there is one problem with this approach. If Wifi module or relay fail manual switches won't work.

[fabriciojimenezcuellar]

I'm having a problem, idk if is something in the code or what could be the problem but the comands are backwards, when I say turn off the lights they turn on and when I say turn on they turn off, help me pls

[govindsisodiya]

Excellent one.... suitable price range of needed components is best suited to one's budget 💯
Thanks for such creative projects..

[snakeeyes]

lol this video open google assistant when he say hey google n i keep rewind it😆😆😆🤣🤣🤣👍🏼