Gas Leakage Detector using Arduino and MQ5 Gas Sensor - with GSM Module for SMS Alerts and Sound Alarm - Ideal for Engineering Project and Seminar Presentation - Read Full Article here - http://www.circuitstoday.com/gas-leakage-detector-using-arduino-with-sms-alert -

1. GAS LEAKAGE DETECTOR USING
ARDUINO WITH SMS ALERT
GAS LEAKAGE DETECTOR USING ARDUINO AND MQ5 SENSOR – WITH SMS ALERT
(USING GSM MODULE) AND SOUND ALARM - ENGINEERING MAIN PROJECT

2. OBJECTIVES OF THE PROJECT
• Detect Gas Leakage (like LPG) using MQ5 Sensor and Arduino
• Setup an SMS based Alert Mechanism using GSM Module
• Send 3 SMS (3 alert messages) to 2 specified mobile numbers
• Sound Alarm – produce sound alert on gas leak
• Display status in an LCD using a 16×2 LCD module.

3. PLANNING OF COMPONENTS
• MQ5 – to sense LPG (use Digital Out to detect level status)
• Arduino
• To read MQ5 output and detect Gas Leak (through level comparison)
• To activate outputs upon gas leak – sound alarm and sms alert
• To send AT Commands to GSM Module
• To send Status message commands to LCD Module
• To Turn ON and OFF Sound Alarm
• GSM Module – for GSM Communication and to send SMS to mobile numbers
• LCD Module – to display status messages
• Speaker – to produce Alarm Sound

4. ARDUINO
• Arduino Uno – an electronic prototyping platform/board based on Atmega AVR
Microcontroller – Atmega328P (8 bits, 16 Mhz)
• Operates on +5 Volts
• 14 Digital I/O Pins (of which 6 are PWM)
• 6 Analog Input Pins
• 32 KB Flash Memory and 1KB EEPROM
• Serial Communication Enabled

5. MQ5 SENSOR MODULE
• MQ5 – is a generic gas sensor used to detect LPG presence
• The module has Digital Out and Analog Out
• Detects LPG from 200ppm to 10000ppm
• Operated on +5 Volts
• Can be used detect other gases like Methane and Alcohol as well

6. GSM MODULE
• SIM 900 GSM Module – is used to send SMS alerts upon gas leak
• Serial Communication is employed
• AT COMMANDS – are used to communicate with GSM Module

7. CIRCUIT DIAGRAM

8. CIRCUIT EXPLANATION-1
• Interfacing MQ5 Sensor to Arduino
• Connecting Digital Out of MQ5 to pin 7
• Interfacing GSM Module to Arduino
• Connect to PWM pins 9 and 10 of Arduino (using SoftwareSerial)
• Tx of GSM Module to 9 and Rx of GSM Module to 10
• Interfacing Speaker to Arduino
• 2N2222 is used as driving transistor
• Connect to Pin 8 of Arduino

9. CIRCUIT EXPLANATION-2
• Interfacing LCD Module to Arduino
• 16x2 LCD Module is used
• Data Lines (DB4,DB5,DB6,DB7) connected to 5,4,3,2 pins of Arduino (in order)
• Enable Pin connected to 11 and RS (Register Select) connected to 12
• Backlit LED is connected to Vcc (+5v) through a 560 ohms current limiting resistor
• Contrast – is adjusted by connecting VEE to a 10K Pot and +5V

10. PROGRAM EXPLANATION - 1
• Important Initializations and Setup
• Sensor MQ5 is assigned to pin 7 using variable ‘sensor’
• Sound Alarm Speaker is assigned to pin 8 using ‘speaker’
• ‘sensor’ – configured as Input
• ‘speaker’ – configured as output
• Software Serial communication is used with PWM pins of Arduino
• <SoftwareSerial.h> - header library is made use of!

11. PROGRAM EXPLANATION -2
• Important Variables
• sms_count – variable used to limit number of SMS
• Gas_Leak_Status – variable to identify ‘gas leak’ occurrence status
• gas_value – temporary variable to store gas level fetched from sensor MQ5
• Gas_alert_val – to store fetched value and to compare with set limit value (during
Scanning for Gas Leak)
• Gas_shut_val – to store fetched value and to compare with set limit value (during
checking for Gas Shut Down Process)

12. PROGRAM EXPLANATION-3
• Important Subroutines
• CheckGas() – has the following functions
• Scans for gas level by calling ScanGasLevel() inner subroutine
• If scanned gas value ‘Gas_alert_val==LOW’ – alert actions are invoked by calling SetAlert() inner subroutine
• Displays status messages on LCD Module – for Scanning Process and Gas Leak Alert
• CheckShutDown() – is to check if gas leak has been eliminated
• Scans for present gas level by calling ScanGasLevel() inner subroutine
• If scanned value stored in variable ‘Gas_shut_val==HIGH’ – gas leak is eliminated
• Immediately stops alarm – with digitalWrite(speaker,LOW)
• Resets the gas leak status variable and sms_count variable – to reactivate Gas Leak Scanning Process and SMS
Alert mechanism

13. PROGRAM EXPLANATION-4
• Important Inner Subroutines
• ScanGasLevel()
• Scans the gas level from sensor MQ5 and stores to temporary variable gas_level
• SetAlert()
• Activates sound alarm through digitalWrite(speaker,HIGH)
• Sends 3 SMS to 2 Mobile numbers by calling SendTextMessage() inner subroutine
• Outputs status message commands to LCD Module
• SendTextMessage()
• Subroutine to send AT Commands to GSM Module for sending SMS

14. APPLICATIONS
• Home Security – can be used in homes (especially kitchen area) to prevent
accidents due to gas leak
• Industrial Security – can be used in sensitive areas to prevent any accidents
• Enhancement – can be enhanced to measure specific gas levels to use in
industrial applications
• Automation – can be enhanced to automate electrical cut off process to
prevent short circuit

15. OUTPUT PHOTOGRAPH
• Read Full Project Here- Gas
Leakage Detector using Arduino

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