Abstract-The
internet of things (IOT) is the communication between all the devices with each
other over the internet. Its control loads with internet connection via
Wireless Fidelity WIFI connection. In this we have created systems using C
programming. actually the simplified definition of IOT is smart home to
operates devices it can be used as a security system. System programming. Making
a program using the Arduino IDE and the Blynk android application. then android
smart phone with Blynk application installed to be used as control panel. ESP8266
microcontroller kit in other side as a controller that receives control
commands via WIFI signal.
Keywords— Blynk, Ethernet, IoT, Wi-Fi,ESP8266.
I.Introduction
A load controlled by computer systems has
many advantages compared with manual controlled loads. Nowadays there are many
programs and applications help to control things better using codes or python
algorithms in artificial intelligence projects. In order to save energy and
make loads monitored easily, this research suggests smart home project based on
IoT technology. This smart home is an Internet of Things (IoT) project that
controls loads with internet connection via Wireless Fidelity WIFI connection.
A smart phone connected to internet with Blynk application as a control panel,
and Nodemcu microcontroller kit in other side as a controller that receives
control commands via WIFI signal. Nodemcu kit is built with ESP8266 WIFI
receiver that able to process and analyze WIFI signal to input the microcontroller.
The WIFI receiver and microcontroller are built in one kit to be used as IoT
project. It’s called Nodemcu.
To connect the system to the
Internet, needs a WiFi receiver. In my case I used ESP8266 that is connected as
built-in in the Nodemcu board that contains a firmware runs with the ESP8266.
The firmware is a low-level control computer software.
The Nodemcu is coded via
Arduino Integrated Development Environment (IDE) with the Universal Serial Bus
port (USB) to tell the Nodemcu what to do, I want to make the Nodemcu controls
four-channel relay kit by Blynk hand phone application.
Parts used to create the project:
1)
Nodemcu board. Open source internet
of things platform.
2)
AC-DC step down converter.
Switch mode power supply to provide the project with power. This project needs
5 volts.
3)
DC-DC is the step down converter
as a regulator to convert the 12 V output of the power supply into regulated 5
V.
4)
Four-channel relay kit. To
drive loads from digital Nodemcu output pins.
5)
Computer with Arduino (IDE)
program installed to code the Nodemcu once.
6) Android smart phone with Blynk application installed to be used as control panel.
II. Methodology
This research is conducted based on the
important steps that are done by orienting on the success indicators in
connecting the NodeMCU ESP8266 module and other devices so that it can be used
to solve multi-objective problems. To achieve these indicators, the stages of
this research are as follows:
1)
Analysis of the problem.
Analyze the problems to be studied regarding smart home.
2)
Analysis of needs. In this case
all needs in researching both from journals, literature books, tools, and
materials.
3)
System design. Designing tools
to be built using the Nodemcu ESP8266 module, and the sensors used.
4)
System programming. Make a
program using the Arduino IDE and the Blynk android application.
5)
Testing tools. Testing tools
with program codes created and internet connections.
6)
Making reports and summarizing
the results of the experiment. See system responsiveness to commands given to
smart home.
a) The Flow of The System
This system mainly depends on ESP8266 WIFI Bord
with the internet of things(IOT) system.
The ESP8266 is linked with internet from the WIFI or hotspots of the smart
phone via WIFI connection as the ESP8266 has Nodemcu circuit to connect with
the internet.
ESP8266(Nodemcu) has to
be connected to the WIFI of the smart phone, needs to recognize the name of hotspot,
the blynk server connects the both password and token code. We have to need the
computer for uploading programme(code) from Arduino Software to the ESP8266. Figure 1 shows that the server
of Blynk application will process the smart phone Nodemcu connection. Blynk
libraries are ZIP files can be downloaded from Git hub website to be imported
to the Arduino IDE library.
Blynk will recognize the internet connection, ESP8266 with android WIFI, the ESP8266 programme having the token code, the name of WIFI and its security password. The data includes to the programme should be match with the WIFI data or information to allows Nodemcu connect with the hotspot to be as a channel to inter exchange commands between android phone and ESP8266.
b) The Block Diagram
The Power Supply will provide energy to the system through the relay and Nodemcu ESP8266 modules, so that all equipment can work and function properly. Nodemcu ESP8266 microcontroller will read the temperature by the Temperature sensor LM35, and then send the data to the Blynk server in TCP / IP format for display on the smart phone. Nodemcu ESP8266 microcontroller will also read commands that have been sent by the Blynk Server in TCP / IP format which will then be changed by giving the logic "HIGH" or "LOW" on certain pins by relay to regulate the on / off of the home lights. Cloud (internet) by utilizing Wi-Fi becomes the central connection between Blynk application and Nodemcu project.
c) Blynk application and Arduino IDE Preparation and Running
This project is running by Blynk application. Down load the application to a smart phone from Google play store and then create a project on it with four switches and one gauge to be as a temperature scale. Set buttons to be switches on D1, D2, D3 and D4. Then set gauge on A0 because the sensor output is on A0 in Nodemcu board.
d) Nodemcu Code via Arduino IDE
To code Nodemcu via Arduino IDE, the Nodemcu needs to be added to
Arduino IDE library first by adding this address to Arduino IDE preferences.
After this reference is added to Arduino IDE, download Nodemcu to boards
manager and then select NodeMCU 1.0 (ESP12E Module). After Nodemcu is added to
Arduino IDE library, upload this code with changing hotspot name and password
also token code.
the Nodemcu code or program. The code includes
the hotspot name and password match with the android. The code does not need to
identify the relay input, as it is included in [Blynk.run();].
When auth (autho token) is given by Blynk application sent as email and SSID is the name of smart phone hotspot.
e) The Hardware of the System
As mentioned above, components used to build the circuit, Nodemcu needs 5VDC as a supply voltage Vin pin, AC to DC converter ( step down ) 12V and DC to DC converter (step down ) 5V, in case using AC to DC converter (step down) 5 volt. Output voltage of the power supply is connected to Vin Nodemcu. When the ground is common. D1,D2,D3 and D4 are outputs
Used:
1)
Vin is connected to power
supply output 5VDC.
2)
GND is ground.
3)
D1, D2, D3 and D4 are used as
digital outputs.
Conclusion
Based on the results of analysis of all data
obtained by testing the home automation with the IOT based Nodemcu ESP6288
module, the below conclusions are:
1)
Smart Home with Internet of
Things (IoT) based Nodemcu ESP8266 Module can be designed with various
components hardware and software support so that it can be arranged into a
smart home system that is controlled with the Blynk android application
according to what is intended.
