Page 71 - IJEEE-2022-Vol18-ISSUE-1

Jumaa, Abd.ulkhaleq, Nadhim, & Abbas | 67

Blynk is an IoT platform that supports both IOS and 3) The Blynk libraries, which consist of various widgets
Android while being compatible with a plethora of to perform different control, display, and time
microcontrollers such as Node MCU (ESP), STM32, management operations.
Arduino and Raspberry Pi over the Internet. The
architecture of Blynk consists of three major b) Proposed System Operations
components: [9]
1) The Blynk application, which controls an embedded This system contains two power sources. The first
system and displays sensing data on widgets. source is a power Supply T09D060-2D1, which is a
transformer that converts high voltage 220v to low
Start voltage 9v and feeds the fan. The second source is a
battery rechargeable (3.3v-5v) that feeds the controller
Initialization (Wi-Fi Node MCU ESP8266) as well as the rest of the
circuit elements.
MQ-2 Gas The controller ports must be connected to the sensor as
sensor follows:
(Vcc ? 3.3v , GND ? GND , A0 ? A0) also (D5 ?
+buzzer , D6 ? + green LED , D7 ? +red LED)
The relay is also connected to the transistor and the fan,
as shown in Fig. (6) below:

No Ye
Is gas
s
level >=

140 ?

ESP8266 ESP8266 Fig. 6: Relay Connections.
Node MCU Node MCU
VII. REAL TIME PROTOTYPE
Send the Turn on red
Gas level to LED & As mentioned in previous sections, this system is built
the Blynk Buzzer & based on the controller (ESP8266) with the gas sensor (MQ-
Fan 2), as shown in the real pictures illustrated in Fig. (7). In the
APP. event of gas leakage, the sensor will send a signal to the
controller, through Wi-Fi technology, the controller will
send a warning text message of the presence of gas leakage
using the Blynk application available on the mobile phone
system. In this system, an IoS mobile phone is used. The fan
and the red light will also work.

Turn on Send
green LED message to
the Blynk

APP.

END Fig. 7: Real-Time Prototype of the Proposed System.

Fig. 5: The Flowchart of the Proposed System.

2) The Blynk server, which allows all cloud-based
communications between smartphones and embedded
systems.