sensor MQ-2 smoke gas sensor module methane liquefied flammable gas

Share on:

Price in USD:Details


Product Overview


Product Description


Weight: 7.4 grams a

Sensor MQ-2 Introduction:
MQ-2 gas sensor sensitive material used in the clean air, low conductivity tin oxide (SnO2). When there is an environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases. Use simple circuit can convert the change in conductivity of the gas concentration corresponding to the output signal. MQ-2 gas sensor for high gas, propane, hydrogen sensitivity of detection of natural gas and other flammable vapors are also very satisfactory. The sensor can detect a variety of combustible gas, it is a low-cost sensor suitable for a variety of applications.

Module Applications:
Gas can be used in homes and factories leakage monitoring device, suitable for the detection of liquefied petroleum gas, butane, propane, methane, smoke and the like;
Module Features:
1, using high-quality dual-panel design, with power indicator and a TTL signal output instructions;
2, with DO switching signal (TTL) output AO analog signal output;
3, TTL output valid signal is low. (When the output low signal light can be directly connected microcontroller or relay module)
4, analog output voltage with the higher the concentration the higher the voltage.
5, liquefied petroleum gas, natural gas, city gas, smoke better sensitivity.
6, there are four screw holes for easy positioning;
7 Product Dimensions: 32 (L) * 20 (W) * 22 (H)
8, with a long life and reliable stability
9, fast response and resume

Electrical properties:
Input voltage: DC5V power (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO Output: about 0.1-0.3V (relatively clean), the highest concentration voltage 4V
Special note: When the sensor is powered, need to warm about 20S, measured data becomes stable, heat sensor is a normal phenomenon, because the internal heating wire, hot if not normal.

test program:

Function: This version of the test program supporting
Use chip: AT89S52
Crystal: 11.0592MHZ
Baud rate: 9600
Compiler Environment: Keil
[Statement] This procedure is used only for study and reference, please indicate the copyright and author information!
************************************************** ******************* /
/ ************************************************* *******************
Note: 1, when the measured concentration is greater than the set density, single-chip IO port output low
************************************************** ******************* /
# Include // library files
#define uchar unsigned char // macro definition unsigned char
#define uint unsigned int // macro definition unsigned int
/ ************************************************* *******************
I / O definitions
************************************************** ******************* /
sbit LED = P1 ^ 0; // define microcontroller P1 port of the first one (ie P1.0) to indicate the end
sbit DOUT = P2 ^ 0; // define the microcontroller P2 port first one (ie P2.0) as an input sensor
/ ************************************************* *******************
Delay function
************************************************** ******************* /
void delay () // delay procedure
uchar m, n, s;
for (m = 20; m> 0; m--)
for (n = 20; n> 0; n--)
for (s = 248; s> 0; s--);
/ ************************************************* *******************
The main function
************************************************** ******************* /
void main ()
while (1) // infinite loop
LED = 1; // off P1.0 port lights
if (DOUT == 0) // When the concentration is higher than the set value, the implementation of the Con
delay (); // delay interference
When if (DOUT == 0) // determine the concentration higher than the set value, the implementation of the Con
LED = 0; // P1.0 port lights lit

Packaging & Shipping

 We offer two kinds of shipping methods:

1.Economy Shipping way  (China post air mail)

Tracking website:


Normally delivery time

Basic  0.1KG

 Extend   0.1KG



15 to 60 working days

6.00  USD

2.00 USD



15 to 60 working days

6.00  USD

2.50 USD



15 to 60 working days

6.00  USD

2.50 USD



 20 to 65 working days

7.00  USD

3.00 USD

2.Expedited Int'l Shipping (FEDEX, DHL, TNT, EMS)
According to different countries and regions your address maybe remote area, we have the right to charge an additional remote cost below:


Delivery time

 For expecial countries  TNT, EMS will spend 10-15 working days.


Normally delivery time

 Basic  0.5KG

Extend  0.5KG


3 to 7 working days

18.00 to 22.00 USD

5.00 to 8.50  USD


3 to 8 working days

20.00 to 25.00 USD

6.00 to 7.50  USD



3 to 8 working days

20.00 USD

6.00 USD



5 to 15 working days

35.00 USD

 12.00 USD





Our Services

 Ruised offers one stop service for Modules and all kinds of electronic components( ICs, diode, Transistors, Optocouplers, Capacitors, Resistors, MOSFET, Crystal, Fuses, Connectors, Switches, Adaptors, Potentiometers, etc..)

We only sell the original new items!

Best Quality Assurance:

1. We only provide the original new items, 100% make sure the best quality!

2. 60-days GUARRANTEE OF QUALITY (After Our Delivery Date).

Payment Methods :

We accept T/T, West Union, PayPal,Alibaba's online trade assurance,Escrow payment .

Refound or Replacement:

We accept return back itmes if the goods still remain in their original condition on the warrant time!



Q1. What is your terms of packing?


A: Generally, we pack our goods in neutral white boxes and brown cartons. If you have legally registered patent,


we can pack the goods in your branded boxes after getting your authorization letters.


Q2. What is your terms of payment?


A: Full payment. Goods would be shipped in 3-5 work days after payment received, finally depends on quantities.


Q3. What is your terms of delivery?




Q4. How about your delivery time?


A: Generally, goods would be shipped in 3-5 work days after payment received, finally depends on order quantities.


Q5. What is your sample policy?


A: We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and


the courier cost.


Q6. Do you test all your goods before delivery?


A: Yes, we have 100% test before delivery


Q7: How do you make our business long-term and good relationship?


A:1. We keep good quality and competitive price to insure our customers benefit ;


2. We respect every customer as our friend and we sincerely do business and make friends with them,


no matter where they come from.


Company Information

Shenzhen Ruised Technology Co., Ltd.  is a professional Electronic component Manufacturer, which have over 8 year business experience.

We specialize in the production of Modules and Electronic Components, IC Chips, Transistors, diode, Triodes, Rectifiers, Sensors, Thyristors, TACT switches, Connectors, Resistors and Capacitors, with well-equipped testing equipment and strong technical force. With a wide range good quality, reasonable prices and fast delivery, our products are extensively used in Civilian equipment, Military industry, Industrial Equipment and other industries.

All of our products come from original famous manufacturers with complete warranty. Our products are widely recognized and trusted by users and can meet continuously developing economic and social needs. This also enables us to gain support and trust from our consumers. Besides, we have established long-term stable and cooperative relationships with a number of retailers and agents. This has helped us succeed in the fierce IC line. We have become the first choice for many customers.


Our advantage:

1.More than 1000,000 own stock inventory to meet your needs of different products.
We specialize in various types of Modules.Active electronic components(Integrated Circuits, , Relay, Sensors, and etc)and Passive electronic components (Filter, Magnetic Bead.diode, Transistors, Capacitors, Resistors, Inductors, and etc) over 10 years.
2. Competitive priceadvantage helps tosave your purchase cost and your precious time.
We wholesale and distribute new,original &famous brand Electronic Components all over the world.
3.Own the international advanced testing equipment of electronic components and scientific storage system to insure the quality stability.
4.Excellent elite team, more than 6 years seniority, and a good understanding of international market trends.

Factory show:


 Warehouse show:


 Office show:


0.011 s.