Alexa Smart Home Automation system using NodeMCU ESP8266 & Relay Module | IoT Projects

In this IoT project, I have made the Alexa Smart Home Automation system using NodeMCU ESP8266 & Relay Module. You can control lights, fans, and other home appliances with the voice command. I have used only the Amazon Alexa app to connect the Echo Dot smart speaker with the NodeMCU.

Download PCB Garber file for this NodeMCU project

Required Components for this Alexa smart home project

Required Components for Relay Module:
1. Relays 5v (SPDT)
2. BC547 Transistors
3. LED 5mm
4. 220-ohm Resistors
5. Connectors

Download Code for this Alexa Home Automation projects

During the video, I have shared the circuit diagram for this Alexa control home automation and also explained the code for this IoT project. This is a very simple home automation project, so you can easily make this smart home device with NodeMCU and Relay module. I have also shown how to set up the Amazon Alexa app for this smart house project. You can control up to 10 home appliances with Alexa.

There is a limitation, the NodeMCU, and the echo dot smart speaker should be connected with the same wifi network.

If you face any issue please let me know in the comment section.

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[partha]

it is working good but I have some issues
when ever power cuts and comes back all device turns on
can u tell me the code to turn them default off after every restart.

[artcloudns]

Sir ssid new bnate hai ya hospot hota hai

[sreeram]

Thank you for the video bro I do exactly and it work superbly when ever my nodemcu is reboot or power cut relay state is turn to normal can you do it to remember the previous relay state something like that to turn which ever device is turned on or not

[jorgebarragan]

Hello greetings from Mexico.
Is it necessary to connect the components (the led or spotlight)?
Or is it enough to load it to the nodemcu without connecting the components?
Since I load the code, but without component, I look for the devices but my echo dot 3gn has not found them

[Doitcreative]

Sir.. can i connect 8 or 16 channel relay ... It can possible to control.... I want to control ten motors using relay by voice commands

[enes]

Can we check with google home and google assistant?

[adamusgruby]

can you describe the rest of the components you saw in the project. For example, what value are the diodes and what are the resistors that are next to the connection block. The resistors that are between the LEDs do not look like 220 because their code starts with black. Can you provide more information or a wiring diagram for this device? Regards. Adam.

[erikhoffman]

Brilliant! I tried to add another 5 output relays but I couldn't - wonder if you can help
I copied everything that include the setting and pasted and changed the values but couldnt
as soon as l add after the Serial.begin(115200); it compiles but will not run

Help would be great
Thanks in advance
Erik Hoffman

[purushottamdey]

Is it able to control from another network or internet (not same wifi network) through alexa?
Obviously nodeMcu will be connected to a fixed alexa device or a mobile which have alexa.

[arijitchakrabarty]

We can control the lights with the alexa app also right??

[adarshsutariya]

supply to relay is from nodemcu???? if yes explain how because it output is 3.3V...

[drakatislit]

i want to interface a small led without relay do i need to change the code for that?

[jcwire]

Great video, can you tell me if I actually need a echo device to discover the nodemcu. Right now I have a fire tv cube and using the Alexa app on my iPhone and it doesn’t seem to be able to discover it

[lolakutony]

Hi i have setup all the connection and uplaod the code on the NodeMCU the last part when i faced problem when connect alexa app in the app it shows me no device found yet i dont know what is the problem please advice

[sanu]

is this same think processible using google assistant

[chiranjibisahoo]

Hey buddy can we directly connect google home mini instead of Alexa to Aurdino library as you shown???I dont wanna use blynk app or ifftt etc..

[balaramyadav]

Hi Iam not able to see in alexa app any lights or discoverable in the app, NodMCU & my mobile & Alexa echo Show its in the same network

[justdoingodswork]

is there any limit of number of devices with ESPALexa.h library?

[rakeshdeb]

Inbuit option for retaining the same state as before power failure should be used. My humble request to you to help me for this.

[beeriotce]

Is it necessary to have an Alexa device or just use my phone to search for it? I don't have Alexa, but I tried the Alexa app to find it, but I couldn't find the device set according to the code.