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Raspberry pie and MQ2 gas smoke sensor example analysis, in view of this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

The MQ135 gas sensor has high sensitivity to ammonia, sulfide and benzene vapor, and is ideal for monitoring smoke and other harmful gases. This sensor can detect a variety of harmful gases and is a low-cost sensor suitable for a variety of applications.

It is said that it needs to be preheated when using it. I use it directly.

Raspberry pie

VCC 1 # 3.5V

GND 6

DO 7

Code

#! / usr/bin/env python

# encoding: utf-8

''

The program tests air pollution every 1 second and stops it with ctrl+c.

Http://blog.csdn.net/ling3ye/article/details/51472533

Wiring diagram:

VCC 1 # 3.5V

GND 6

DO 7

''

Import RPi.GPIOasGPIO

Import time

CHANNEL=7

GPIO.setmode (GPIO.BOARD)

GPIO.setup (CHANNEL, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

Defaction (pin):

Print'Sensor detected actionaries'

GPIO.add_event_detect (CHANNEL, GPIO.RISING)

GPIO.add_event_callback (CHANNEL, action)

Try:

WhileTrue:

Print'alive'

Time.sleep (0.5)

ExceptKeyboardInterrupt:

GPIO.cleanup ()

Before the lighter approaches and deflates:

After the lighter is close to deflation: gas is detected, except for the power indicator, the signal indicator light will be on.

This is the answer to the sample analysis of raspberry pie and MQ2 gas smoke sensor. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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