I have shown how to make IoT-based Smart Home Automation Using Tasmota Amazon Alexa & ESP8266 NodeMCU to control 4 home appliances from the manual switch & Amazon Alexa Appin this IoT project. If the internet is not available, then you can control the home appliances from manual switches.
During the article, I have shown all the steps to make this smart home system. You don't need any coding skills to make this project, so anyone can make it.
Tutorial Video on Tasmota ESP8266 Alexa Smart Home System:
This Tasmota ESP8266 smart home system has the following features: Control home appliances with voice command using Alexa. Control home appliances with manual switches. Monitor real-time feedback in the Alexa App. Control home appliances manually without internet. So, you can easily make this home automation project at home just by using a NodeMCU and relay module. Or you can also use a custom-designed PCB for this project.
- NodeMCU board
- 4-channel SPDT 5V Relay Module
- Push Buttons or Switch
- Alexa Echo Dot
You can make this project just by using NodeMCU and 4-channel relay module. But if you use PCB then you need the following components.
Required Components for the 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 Required Software:
1. Arduino IoT Cloud
2. Arduino IDE
3. Amazon Alexa App
Circuit Diagram of the NodeMCU Home Automation Project:
This is the complete circuit diagram for this home automation project. I have explained the circuit in the tutorial video.
The circuit is very simple, I have used the GPIO pins D1, D2, D5 & D6 to control the 4 relays.
And the GPIO pins SD3, D3, D7 & RX are connected with push buttons to control the 4 relays manually.
I have used the INPUT_PULLUP function in Arduino IDE instead of using the pull-up resistors.
I have used a 5V mobile charger to supply the smart relay module.
Here, the D3 pin should not be connected with GND during the booting process of NodeMCU.
Alexa Control Relay Using NodeMCU:
If the NodeMCU is connected with the WiFi, then you can control the home appliances from Amazon Alexa App and also from the manual switches.
You can control, monitor the real-time status of the relays in the Alexa App from anywhere in the world.
You need an Amazon ECHO device for this home automation project.
Control Relays Manually With Switches:
You can also control the relays from the switches or pushbuttons.
You can monitor the real-time feedback in the Tasmota dashboard or Alexa App.
Please refer to the circuit diagram to connect the pushbuttons or switches.
Design the PCB for This Smart Home System:
To make the circuit compact and give a professional look, I have designed the PCB after testing all the features of the smart relay module.
You can download the PCB Gerber file of this home automation project from the following link:
Order the PCB:
After downloading the Garber file you can easily order the PCB
1. Visit https://jlcpcb.com and Sign in / Sign up
2. Click on the QUOTE NOW button.
3. Click on the "Add gerber file" button. Then browse and select the Gerber file you have downloaded.
Uploading the Gerber File and Set the Parameters:
4. Set the required parameter like Quantity, PCB masking color, etc.
5. After selecting all the Parameters for PCB click on SAVE TO CART button.
Select Shipping Address and Payment Mode:
6. Type the Shipping Address....Read more »