Hello friends, welcome to Tech StudyCell. In this
video, we'll make an Alexa home automation project using the NodeMCU and a relay module to control
four home appliances using the manual switch and the Amazon Alexa app. For this home automation
project, you don't need an Alexa device. You can control the home appliance just by using the
Amazon Alexa app from anywhere in the world. Let me show you how it works, "Alexa,
turn on outdoor light". "okay". "Alexa turn on studio light". "okay". Thus you can
easily control the home appliance with the voice, and you can also control it from the Amazon
Alexa app. Now let me turn off all the lamps. now I will control it from the switch. you can easily control each lamp from the switch and you can also monitor the real-time status
of each switch. Let me show you, if I select the outdoor light, right now the lamp is off. If I
turn it on you can see the real-time status in the Amazon Alexa app. Now let me turn off the internet
and show you how it works without internet. After turning off the internet I can control these
lamps only from the switches. Let me show you. I can easily control this lamp from this
manual switch without using any WiFi. Now let me turn on the WiFi again, as you can
see the blue led automatically turns on which indicates the Nodemcu is now
connected with the WiFi. So I can control the home appliance using the Alexa
app and the manual switches. Let me show you, "Alexa turn on outdoor light". "okay". Let me
control the other lamps from the manual switch. Thus you can easily make this home automation
project just by using Nodemcu and a relay module. I will highly recommend you to watch
the complete video as during the video I will share the complete circuit diagram the
code for this project and all other details. And as you can see you don't need any custom
design PCB for this project so you can easily make this project for your home after watching
the complete video so let's get started... To make this project, you just need
a Nodemcu and a relay module. And to control the home appliance manually you can use
the existing switchboard. Now we have to connect all these components as per this circuit diagram.
As you can see there is a lot of connections so to give the project a professional look I have
designed a PCB for this project, and order it from the JLC PCB. You can order any custom design
PCB from jlcpcb with three simple steps. First, upload the Gerber file. Then select the parameters
like quantity, PCB masking color, then place the order. If you select faster delivery service then
you will get the PCB within a week. And as you can see the quality of the PCB is very premium in
this affordable price range. So you can always try jlc pcb for any custom design PCB project. These
are the components required for the PCB. Now I will quickly solder all the components on the
PCB. Now let me connect the Nodemcu with the PCB. Before uploading the code, you have to create a
Sinric account. For that visit Sinric.com/login. I will share the link in the description. Then click
on register and enter the name and email address and set up a password. After that click on submit.
Then log in to your Sinric account with the registered email id and password. After login, you
will get an API key which will be required in the code. Now, to add a device, click on "Add". Give
a device name, say, "outdoor light". You can give any name, Alexa will identify that particular
device with this name. The device type will be "Switch". Now click on "Save". Thus you can add
multiple devices. Here you can see I have added four devices. As I want to control 4 devices with
Alexa and each device will get a unique device id, which will also require in the code. This is
the code for this project. Please visit our website iotcircuithub.com to download the code.
I will share the link in the description. Before uploading the code, copy these 2 URLs, then go to
File, Preference. And paste it here. After that, you have to download and install the esp8266
board. Then you have to install these 3 libraries. I will suggest you to use these links to
download the latest version of the libraries. Then go to "Sketch", "Include Library", "Add
ZIP Library" to install all the latest versions of these three libraries. After installing
the libraries you have to enter the API key. For that, I will go to the Sinric account.
Copy the API key, then I will paste it here. Then you have to enter the WiFI credential.
Here you have to enter the WiFi name and the WiFi password. After that, you have
to enter the device id for each device. As I said, I have created four devices. I have to
copy the device id and paste it here. Like that, you have to copy all the device id from the Sinric
account and paste those device id at this place. If you refer the same circuit, then after doing
these changes, you can directly upload the code to the Nodemcu board. For that go to "Tools".
Select NodeMCU board and the proper PORT. Then hit the upload button. Now we will quickly
connect all the devices with the Amazon Alexa app. For that, you have to download and install the
Amazon Alexa app from the Google play store or App Store. Then tap on open. Then tap on
"More", and select "Skills and Games". Here you have to search for Sinric, and
then select the first option. Then tap on "Enable to use", then enter the
registered email id and Sinric password. After successfully login go to the Amazon Alexa
app again and tap on the "Discover Devices". it will take some time and during this time,
the Nodemcu should be connected with the WiFi. You can see Alexa found four devices. Now go to
"Devices", and in the "Switches" you can see all the four devices we have just connected. If you
have an echo dot device then you can use that device for this project but if you don't have it,
you can just use the Amazon Alexa app to control the relay with Alexa. Now we will quickly connect
the four home appliances with the relay module as per this circuit diagram. As you can see I have
connected the four lamps with the relay module as per the circuit. And I have used a 5-volt
mobile charger to give 5 volt supply to Nodemcu. Let me connect the 5 volt supply. Now we can
control the relays using the manual switches and Alexa app. Let me show you, "Alexa, turn on
outdoor light". "ok". "Alexa, turn on study lamp". "okay". Thus you can easily control all the lamps
using the manual switch and also from the Amazon Alexa app. So this is a very useful and practical
home automation project you can control the home appliances with your voice and also from your
existing switchboard. I will request you to join our telegram channel Tech StudyCell. I do
post different circuit diagrams in that channel. I will share the link in the description and
please do subscribe and hit the bell icon to get notifications for more such home automation
projects. Thank you for watching have a great day.
