Gas Leak Monitoring

Gas Leak Detection Project with GrovePi  and Hologram Nova

 This project uses Grove Gas Sensor (MQ2) for detecting gas leakage and it can also send notifications using cellular network.  It can be used for detecting the following:

•   Smoke
•   Propane
•   Carbon Monoxide
•   Liquified Petroleum Gas
•   H2
•   Methane

  

Things used in this project:

Hardware components:

• Raspberry Pi Zero  WH
• GrovePi Zero 
• Gove -Gas Sensor (MQ2)
• Grove LCD RGB Backlight
• Hologram SIM

Software Apps:

• GrovePi 
• Python
• Hologram CLI

Gas sensor module from Grove system provides  the ability to detect if there is any gas leakage of combustible gas or smoke. The measurements can be taken as soon as possible due to its sensitivity and fast response time.  


GrovePi Zero is a HAT from Dexter Industries  that allows Grove Gas Sensor (MQ2) to connect to Raspberry Pi zero with out needing soldering or breadboards. One can plug in the Grove water sensor start programming.

Grove sensor sensor works with analog I/O pins and it can be connected to A0 port Grove Pi Zero as shown below.
The installation instructions for Grove Pi zero and Hologram SIM are provided here .

The following program (gas_sensor_led.py) checks the gas sensor output sets the text on LCD.

First  a cellular connection is established using the credentials that uses a devicekey obtained from Hologram dashboard.

import time
import grovepi
from Hologram.HologramCloud import HologramCloud

# Provide Hologram device key
credentials = {'devicekey': 'xxxxxxx'}
hologram = HologramCloud(credentials, network='cellular')


# Connect the Grove Gas Sensor to analog port A0
gas_sensor = 0

grovepi.pinMode(gas_sensor,"INPUT")

while True:
    try:
        # Get sensor value
        sensor_value = grovepi.analogRead(gas_sensor)
  
      # Calculate gas density - large value means more dense gas
        density = (float)(sensor_value / 1024)

        if(sensor_value > 825):
         response_code = hologram.sendMessage("High Gas Sensor Value" +str(sensor_value))
        time.sleep(10)

    except IOError:

After execution of the above program, the status is displayed on the LCD.

 $ sudo python gas_sensor_led.py

After reading the analog input from port A0 it  displays the sensor value on the LCD and it also sends notification using cellular network if the sensor value exceeds the predefined threshold value.