ESP32 Home Automation with KME Smart IoT Platform

Overview
In this
IoT project
, I will show you how to make
Home Automation
project with
ESP32
and
KME Smart
IoT Platform. The project doesn’t require any coding all the configuration on only done via KME Smart dashboard. By sending
on/off
command from KME Smart App, we can control 4 relays via ESP32 network.
Previously, we developed a
Home Automation project
based on the ESP32 platform, utilizing platforms such as
Blynk
AWS IoT Core
and
Arduino IoT Cloud
. To enhance portability and ease of use, a
custom PCB
is designed specifically for this project. Since, it does not require any coding, the method to configure the device require multiple dashboard setup and steps which we will see in the guide
Once the
ESP32
connects to
WiFi
, it automatically links up with the
KME Smart IoT Platform
. This connection gives you a simple, centralized way to manage and remotely
control your home devices
through 4
relays
. The setup is self-contained, reducing the need for other
IoT apps
and fits smoothly into your
home automation system
, making everything more convenient and functional.
Bill of Materials
For this project, we will need the following components. The component list, footprint, and quantity are given below.
S.N.
Component
Designator
Footprint
Quantity

Capacitor 100nf
C1, C3, C6, C7, C8, C9, C10, C11
CAP_0805

Capacitor 10uf
C2, C4, C5
CAP_0805

Capacitor 220uF, 25V
C12
FP-RAD-TH-D_10_0_5-L_16_1-MFG

Diode 1N4007
D1, D2, D3, D4
DIOM5027X262N

SP4322-01ETG
D5
SP432201ETG

Optocoupler PC817C
IC1, IC3, IC4, IC5
DIP762W60P254L458H450Q4N

ESP32 WROOM-32
IC2
ESP32WROOM3216MB

2-Pin Terminal Block
J1

3-Pin Terminal Block
J2, J3, J4, J5

Relay SRD-05VDC-SL-C
K1, K2, K3, K4
SRD

LED Red
LED1, LED2, LED3, LED4, LED5
LEDC2012X80N

Male Header 6 Pin
P1
HDR1X6

HLK-10M05
PS1
HLK10M05

Transistor BC847B
Q1, Q2, Q3, Q4, Q5, Q6
BC847B215

Resistor 220R
R1, R3, R9, R11, R14, R16, R17, R19

DNP
R2, R10, R15, R18

Resistor 12K
R4, R12, R13

Resistor 1K
R5, R7, R8, R24

Resistor 470R
R6

Resistor 10K
R20, R21, R22, R23

Push Button Switch
S1, S2, S3, S4
B3W1020

Manual Switch (Optional)
SW1, SW2, SW3, SW4
HDR1X2

HT7333 3.3V Voltage Regulator
U1
IC_HT7333

Circuit Diagram & Hardware Design
Let us take a look at the
Schematic
of ESP32 Automation System using KME Smart IoT platform. The schematic is designed using the
Altium Designer
Software.
Fig: ESP32 Home Automation Circuit/Schematic
We used SMD resistors, capacitors, and LED with the 0805 package. To convert
220V AC
to
5V DC
, we used an
AC-to-DC Converter
from
Hi-Link
. For providing power to ESP32 raw chip and other peripherals, a low-power
LDO HT7333
IC was used. To separate the high-power line from the 3.3V circuit
PC817 optocoupler
IC is used. The LED5 in the circuit is used to indicate power.
Similarly the
LED1, LED2, LED3
&
LED4
is used to represent
Relay1, Relay2, Relay3
&
Relay4
output respectively. The LED5 is a power indication LED. The 4 Relays are connected to ESP32 via GPIO Pins 12, 14, 27, 26. The push buttons
SW1, SW2, SW3
, and
SW4
are used in the manual controlling of Relays. They are connected to GPIO Pins 5, 17, 13, 16. You may attach a
manual switch
there and program the controller to control the circuit.
You can connect
4 home appliannces
using the Relay connections at 3 Pin Terminal
J2, J3. J4, J
5. The 2 Pin Terminal
J1
is used to supply
AC Power
directly to the Circuit. A Capacitor C12 of 220uF, 25V is connected to PCB stop voltage fluctuations.
To program the
ESP32 raw chip
, the
FTDI pin
is provided. We can connect an
FTDI Module
(USB-to-TTL Converter) to program the ESP32 Chip directly.
Project PCB Gerber File & PCB Ordering Online
We have designed the
PCB
using the
Altium Designer Software
. It took quite a lot of time fixing all the isses in the PCB but still we managed to design a complete working custom PCB.
The top part of the PCB design looks like this.
Fig: Top Layer of PCB Board
The bottom part of the PCB board looks like this.
Fig: Bottom Layer of PCB Board
Here is the
3D View
of the PCB from the front side.
Fig: Top Layer 3D View of PCB Board
Similarly here is the 3D view of the bottom layer of the PCB Board.
Fig: Bottom Layer 3D View of PCB Board
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 Gerber File
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.
PCB & Hardware Assembly
After ordering the PCB, it took almost 5 days and I got my PCB.
The PCB quality from
ALLPCB
is superb with very premium quality. That is why most people trust
ALLPCB
for PCB/PCBA Services.
Fig: PCB Board Top Side
Fig: PCB Board Bottom Side
First solder all the
SMD components
like resistors, capacitors, transistors, LEDs, voltage regulators & diodes. Be careful about the SMD LED polarity, place it in the proper direction. The SMD soldering is to be done on the both sides.
Fig: Top Assembled/Soldered Layer
After soldering all these, you can solder the
ESP32 raw chip
. The final stage would be soldering all the through-hole components like Optocoupler IC, terminal block, Relays, male-female headers, and AC-to-DC Converter Module.
Fig: Bottom Assembled/Soldered Layer
After soldering all the components, the ESP32 KME Smart IoT Home Automation Board is ready for the test. You can upload a blink sketch by connecting a
USB-to-TTL Converter
Module.
Fig: KME Smart ESP32 Home Automation Board
Note:
There were some voltage fluctuation issues in the designed PCB, so I have updated the design by adding 220uF capacitor. Also, some connection issues have been fixed. The Gerber file above is updated and the PCB would be little different from shown above. But overall the functionality is same.
Preparing the ESP32 Chip for KME Smart Platform support
For this project, there is no coding requirement. Therefore we don’t need to write any code to the ESP32 microcontroller. Still we need to configure the ESP32 to work with the KME Smart App.
First we need to download the KMESmart Config file. For that go to the following link:
kmeconfig.html
Download the latest available zip file available.
After downloading is completed, extract the file.
On the extracted folder, there is an executable file with the name “
kme_config.exe
“. Run this file by double clicking on it.
The KME Config software will open as shown in the image above. From here we need to configure our ESP32 Board.
Connect the ESP32 Board to the computer using the micro-USB Cable. In my case, I am using a PCB board, therefore I have connected it to the computer via FTDI Module.
On the KME Config app. Click on the 3 dash on the top right side.
From here, Select the COM port which your ESP32 is connected to.
Now click on upload firmware. The firmware uploading process on ESP32 board will start. You can see everything in progress bar as percentage.
Once the firmware is uploaded, the ESP32 MAC ID and Device ID can be seen.
Your ESP32 is now configured to be used with the KME Smart IoT Platform system.
Setting Up KME Smart IoT Dashboard
Now the ESP32 is configured to be used with KME Smart IoT platform but yet not ready for Home Automation System. Therefore we need to setup the dashboard for KME Smart System.
Click on the add sign at the top right of the App. On the left side the widgets will appear.
For 4 relays, we need 4 Relay or Digital Output. Therefore add 4