Home Automation System using NodeMCU

Introduction

• Control home appliances with Google Assistant and Alexa
• Manual control with switches
• Real-time status monitoring in Google Home and Alexa app

Key Features

• Both Android apps can control without needing an Alexa device or Google Home
• Manual control remains viable even without the internet

Demonstration

• Commands shown:
  • Hey Google, turn on all lamps
  • Hey Google, turn off room light
  • Alexa, turn on room light
  • Alexa turn off night lamp
• Manual switch control demonstrated

Working Without Internet

• WiFi turned off
• Manual switches used for control
• Reconnected to WiFi to resume automated control

Project Overview

• No need for custom design PCB: NodeMCU and relay module suffice
• Circuit diagram and code provided

Components

• NodeMCU
• 4-channel relay module
• Existing switchboard or pushbuttons
• Detailed circuit wiring described

Circuit Details

• Switches connected across GPIO pins and ground pins
• Safety precautions emphasized while handling AC circuit
• Alternative circuit for push buttons provided

Professional Look

• PCB designed and ordered from JLCPCB
• Steps to order PCB outlined:
  1. Upload Gerber file
  2. Select parameters (quantity, masking color)
  3. Place the order
• Quality of PCB highlighted

Assembly

• Components soldered on PCB
• NodeMCU connected with PCB

Sinric Pro Configuration

• Visit Sinric Pro page for account setup
• Steps to create an account demonstrated
• Creating rooms and devices in Sinric Pro
• Mentioned unique IDs for devices needed in code

Programming NodeMCU

• Code available on iotcircuithub.com
• Required libraries listed: SinricPro, ArduinoJson, WebSockets
• WiFi credentials and Sinric Pro APP KEY and APP SECRET required
• Device IDs entered from Sinric Pro account

Uploading Code to NodeMCU

• Tools > Board: NodeMCU 1.0 and select proper PORT
• Upload button clicked

Amazon Alexa App Configuration

• Steps to link Sinric Pro with Alexa app
• Discover devices in Alexa app
• Three devices successfully found

Google Home App Configuration

• Steps to create a home in Google Home app
• Linking with Sinric Pro
• Devices found on Google Home app
• Control via app demonstrated

Conclusion

• Useful Smart Home system
• Limitation of free version of Sinric Pro (max 3 devices)
• Join Telegram channel "Tech StudyCell"
• Encouragement to like, share, and subscribe

Additional Notes

• Mention of free version restriction for NodeMCU booting process with switches