In this IoT projects, I have shown how to make the NodeMCU ESP8266 Alexa App voice control home automation system to control 4 home appliances without using any amazon Alexa echo dot devices. If no internet, still you can control the relays from manual switches with this Smart Home system.

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Download PCB Gerber file for this NodeMCU IoT based home automation project
https://drive.google.com/uc?export=do...

**Sinric will expire soon. For Sinric Pro please refer to the following updated tutorial video
   • Smart Home with Google Assistant & Al...  

During the tutorial video, I have covered the following topics:
00:25 How to control 4 relays using NodeMCU from Alexa App and switches.
02:56 Circuit diagram of this ESP8266 IoT based Smart Home project.
03:49 How to create an account and add devices in Sinric.com.
04:51 Programming the ESP8266 NodeMCU with Arduino IDE
06:25 How to connect IoT devices & ESP8266 with Amazon Alexa App.
07:36 Connect home appliances with the smart relay module.
08:02 Controlling 4 appliances with Alexa using the NodeMCU control relays.

Required Components for this Alexa home automation system
1. NodeMCU
2. 4-channel 5V SPDT Relay Module
3. Switches
4. Amazon Alexa Echo Dot (optional)

Amazon India Affiliate links:
NodeMCU : https://amzn.to/3fJA4EG
4-channel 5V Relay Module : https://amzn.to/2BQ5Y3o
Alexa Echo Dot (4th Gen) : https://amzn.to/3srCiPA

Amazon United States Affiliate links:
NodeMCU : https://amzn.to/2WoR2A2
4-channel 5V Relay Module : https://amzn.to/3r2HuJ4
Alexa Echo Dot (4th Gen) : https://amzn.to/37sSd84

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 (5 no) (D1 -- D5)
8. Push Buttons (4 no)
9. Terminal Connectors
10. 5V DC supply

**Sinric will expire soon. Please refer to the following updated tutorial video with Sinric Pro
   • Smart Home with Google Assistant & Al...  

Download Code for this NodeMCU smart house automation project from the following article
https://iotcircuithub.com/nodemcu-ale...

If you use Push Buttons instead of switches then download the following code.
https://drive.google.com/uc?export=do...

Sinric.com Link: https://sinric.com/login

**During the start or Boot process, the Switch1 (Pin SD3) should be OFF. Because if the SD3 pin connected with the GND pin the boot will fail. If you use push buttons then ignore this.

During the internet of things tutorial video, I have explained all the steps to make this amazon home automation system to control 4 home appliances with and without internet. You can use both Alexa Echo Dot and the Alexa mobile app to control the relay module from anywhere in the world. And you can also monitor the real-time feedback in the Amazon Alexa IoT applications. So with this smart house project, you can convert any appliance to Alexa compatible devices and control them with voice commands.

#internetofthings #esp8266 #Alexa
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