Home Automation with Arduino IoT Cloud using ESP32

Overview: Home Automation with Arduino IoT Cloud & ESP32
In this project, we will learn about the application of
Arduino IoT Cloud
with
ESP32
. Recently the Arduino Community launched their IoT platform called
Arduino IoT Cloud
. You can connect multiple devices to each other and allow them to exchange
real-time data
. You can also monitor data from anywhere using a simple user interface. To learn more about the Arduino IoT Cloud, you can go through the
documentation
part.
As an example, you can
control multiple home appliances
from the
Arduino IoT Cloud Dashboard
. We will interface a
4 channel relay
with
ESP32 WiFI Module
& send the
ON/OFF
commands either from the mobile phone
dashboard
or from Computer Dashboard and
Control Relay, Light
, or anything else. So, let’s see how can deploy this entire system. To know more about the Arduino IoT Cloud, you can refer the article
Getting Started Tutorial
But before that, you can check some of our H
ome Automation Projects
made using
ESP8266
or
ESP32
:
1.
Home Automation using NodeMCU & Alexa
2.
Home Automation using NodeMCU & Android
3.
Home Automation using ESP8266 WebServer
4.
Home Automation using Blynk & NodeMCU
5.
Home Automation using Google Firebase & NodeMCU
6.
Home Automation using AWS IoT Core & ESP32
7.
Home Automation using Alexa & ESP32
8.
Home Automation using ESP32 WebServer
Bill of Materials
For this project, we will need an ESP32 Board, 4 channel relay, few jumper wires and breadboard. For demo, we can use 4 bulbs with 4 holders or any other electrical appliances.
All the components can be easily purchased from Amazon through the below Amazon purchase links.
S.N.
Components Name
Quantity
Purchase Links
1
ESP32 WiFi Module
1
Amazon
AliExpress
2
Relay 5V
4
Amazon
AliExpress
3
7805 Voltage Regulator
1
Amazon
AliExpress
4
DC Power Jack DCJ0202
1
Amazon
AliExpress
5
Diode 1N4007
4
Amazon
AliExpress
6
Resistor 330-ohm
5
Amazon
AliExpress
7
BC547 NPN Transistor
4
Amazon
AliExpress
8
Terminal Block 5mm
4
Amazon
AliExpress
9
LED 5mm Any Color
1
Amazon
AliExpress
10
Female Header 2.54mm
2 Set
Amazon
AliExpress
Circuit Diagram & Hardware
The circuit for
Home Automation
using
Arduino IoT Cloud & ESP32
is very simple. I used
Fritzing
software to draw the schematic. The below diagram is only for the breadboard Assembly.
The ESP32 Board has so many GPIOs Pins. In this project, we will be using
GPIO19
GPIO21
GPIO22
&
GPIO23
for controlling the Relay. Across the output of the relay, we will use bulbs for testing and demo. You can use a
9V DC Adapter
to power the circuit as the output of
7805 Voltage Regulator IC
connects to
Vin
of ESP32.
Project PCB Gerber File & PCB Ordering Online
If you don’t want to assemble the circuit on a breadboard and you want
PCB
for the project, then here is the PCB for you. I used EasyEDA to design the PCB. The PCB Board for
Home Automation with ESP32
looks something like below.
The Gerber File for the PCB is given below. You can simply download the Gerber File and order the PCB from
ALLPCB
at
1$
only.
Download Gerber File:
ESP32 Home Automation PCB
You can use this Gerber file to order high quality PCB for this project. To do that visit the
ALLPCB
official website by clicking here:
https://www.allpcb.com/
You can now upload the Gerber File by choosing the Quote Now option. From these options, you can choose the Material Type, Dimensions, Quantity, Thickness, Solder Mask Color and other required parameters.
After filling all details, select your country and shipping method. Finally you can place the order.
You can assemble the components on the PCB Board.
Setting Up Arduino IoT Cloud Dashboard
Now it’s time to set up the Arduino IoT Cloud Dashboard. Go to the Arduino Store. Click on IoT Cloud.
Then you need to create a Thing first. To do that click on add variable.
Name the variable anything like Light1. In the variable type select bool. So an automatic variable declaration will be done. Then click on Add variable. The first variable is created.
Similarly create other three variables with names Light2, Light3, Light4.
Now, we need to configure a device as well. For that select the device option. From the list select a 3rd party device. Then select ESP32. From this list select ESP32 Developer Module.
Click to continue and give any name to the device. Then click Next. So device ID & Secret Key is created here. Save this device ID for the coding part. Or simply download this PDF File which has the information of Secret Key. Then click on continue.
Now again you need to set up the Network Credentials. So input your SSID, Password as well as Secret Key that you created earlier. Finally, everything is set now.
Go to the dashboard. Here we need to build a dashboard.
From the edit option add a variable. So select switch.
Give it any name. Then link a variable. Click on Done.
Similarly, add 3 more variables for 3 different switches and link the variable to them. You can arrange the widget or resize the widget as you wish.
So finally you are done. The dashboard setup is ready.
Source Code/Program
Now let’s go to the sketch for
Home Automation with Arduino IoT Cloud & ESP32
There are 4 variables with bool automatically declared.
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2
3
4
bool
light1
;
bool
light2
;
bool
light3
;
bool
light4
;
In the setup part, we will define 4 pins of ESP32 as output. Those 4 pins are pins 19, 21, 22, and 23.
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2
3
4
pinMode
(
19
OUTPUT
)
;
pinMode
(
21
OUTPUT
)
;
pinMode
(
22
OUTPUT
)
;
pinMode
(
23
OUTPUT
)
;
Initialize them with high logic, so that all appliances are turned off initially.
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2
3
4
digitalWrite
(
19
HIGH
)
;
digitalWrite
(
21
HIGH
)
;
digitalWrite
(
22
HIGH
)
;
digitalWrite
(
23
HIGH
)
;
Below the void Light function, assign a condition that if the command from the Arduino IoT Cloud Dashboard Pin is high, the relay should turn ON. Else if the command is low, the relay should turn OFF.
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if
(
light1
==
1
)
{
digitalWrite
(
19
LOW
)
;
}
else
{
digitalWrite
(
19
HIGH
)
;
}
Here is the complete code that you can use for this project.
Home_Automation.ino
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#include \"arduino_secrets.h\"
/*
Sketch generated by the Arduino IoT Cloud
https://cloud.arduino.cc/
Arduino IoT Cloud Variables description
The following variables are automatically generated and updated when changes are made to the Thing
bool light1;
bool light2;
bool light3;
bool light4;
Variables which are marked as READ/WRITE in the Cloud Thing will also have functions
which are called when their values are changed from the Dashboard.
These functions are generated with the Thing and added at the end of this sketch.
*/
#include \"thingProperties.h\"
void
setup
(
)
{
// Initialize serial and wait for port to open:
Serial
begin
(
9600
)
;
pinMode
(
19
OUTPUT
)
;
pinMode
(
21
OUTPUT
)
;
pinMode
(
22
OUTPUT
)
;
pinMode
(
23
OUTPUT
)
;
digitalWrite
(
19
HIGH
)
;
digitalWrite
(
21
HIGH
)
;
digitalWrite
(
22
HIGH
)
;
digitalWrite
(
23
HIGH
)
;
// This delay gives the chance to wait for a Serial Monitor without blocking if none is found
delay
(
1500
)
;
// Defined in thingProperties.h
initProperties
(
)
;
// Connect to Arduino IoT Cloud
ArduinoCloud
begin
(
ArduinoIoTPreferredConnection
)
;
/*
The following function allows you to obtain more information
related to the state of network and IoT Cloud connection and errors
the higher number the more granular information you’ll get.
The default is 0 (only errors).
Maximum is 4
*/
setDebugMessageLevel
(
2
)
;
ArduinoCloud
printDebugInfo
(
)
;
}
void
loop
(
)
{
ArduinoCloud
update
(
)
;
// Your code here
}
void
onLight1Change
(
)
{
i