1pcs MQ-2 MQ2 Smoke Gas LPG Butane Hydrogen Gas Sensor Detector Module for arduino

(16 customer reviews)


281 in stock

SKU: 32293666921 Categories: ,

5pcs/bag MQ-2 MQ2 smoke sensor gas sensor

HC-05Main , main switch from integrated Bluetooth serial module from the available instructions, instruction rich range( Supply voltage 3.3V ~ 3.6V)

HC-06Main , main switch from integrated Bluetooth serial module from the available instructions, instruction than HC-05, easy to use.( Supply voltage 3.3V ~ 3.6V)

Host:Used to search from the device , other devices can not be search . ( With white spots Bluetooth module )

Slave :Equipment used to be searched , you can not take the initiative to search for other devices.

After connecting the master and slave is equivalent to using a serial line , this time , regardless of master and slave , which is transparent mode .

[ This module can be set to master or slave , master and slave pair can communicate between slave and from the host machine or host

Can not communicate between , from the Bluetooth function and computers, mobile phones and other communications pairing , the default is the purchase of a slave ]

[Note: HC-05 and 06 from the host machine can be paired with each other ]

1, using mainstream CSR Bluetooth chip , Bluetooth V2.0 protocol standards .

2 , the module supply voltage : 3.3V ~ 3.6V.

3, the default parameters : 9600 baud , pairing code 1234 , the mode of the slave.

4 , the core module size is : 27mm x 13 mm x 2mm.

5, the working current:Pairing :30~40mAPairing communication has not been completed :2~8MaCommunication :8mA no dormancy .

6. Communication distance: open conditions under 10M, normal use of the environment around 8M.

7 , for the GPS navigation system , utility meter reading systems, industrial control systems mining site ,With Bluetooth notebook computer, computer plus Bluetooth adapter , PDA and other devices seamlessly.

8 , you can upgrade STC microcontroller wireless and download the program.

Pin Name Explanation
1 TX Pin serial port module (TTL level , can not be directly connected to RS232 level ) , can be directly connected to the microcontroller RX
2 RX Module serial receive pin (TTL level , can not be directly connected to RS232 level ) , can be directly connected to the microcontroller TX
12 VCC Power 3.3V
13 GND Ground
32 LED Pairing status output display
34 KEY AT for entering state , high effective ( float default is low)

Modules There are two ways to enter the AT command

1 : Before the module power ( can also ) , the KEY pin is set high ( or pick VCC), then the module is powered on . The LED flashes slowly (2S once ) , the module into AT status , 38400 baud rate is fixed .

2 : On the module power when the KEY feet set low ( or pick GND), the LED flash (1S twice ) , then put KEY foot set high ( or pick VCC), module will enter AT commands , but the LED flash is still , at this time as the default baud rate 9600 baud .

Computer and SCM data transmission

In the following figure USB-TTL parameter frame for Guangzhou- bearing frame newly developed parameters HC-USB-P, Bluetooth products specifically tailored for HC powerful arguments aircraft. Customers can use this parameter to change the frame of the module parameters and testing , greatly facilitate the customers to use a variety of problems encountered during the Bluetooth module .

Product Features :

1, led pin indicates the status of the Bluetooth connection , the output pulse indicates no Bluetooth connectivity , high output indicates that Bluetooth is connected and open ports

2 , the power supply voltage 3.3V, when unpaired current of about 30mA, after the pair about 8mA, the absolute prohibition of reverse power ! Power absolute prohibition exceeds 4.2V!

3 , interface level 3.3V, can be directly connected to various SCM (51, AVR, PIC, ARM, MSP430 , etc. ), 5V microcontrollerThe best a 1K resistor in series with the module againDirect connection, can not pass without MAX232 MAX232!

4 , open to the effective distance of 10 meters , over 10 meters are possible, but do not do this to ensure the quality of the connection distance

5 , after the pair when full-duplex serial port to use, without having to know any Bluetooth protocol, but only supports 8 data bits, 1 stop bit , no parity communication format , which is the most common form of communication , not support other formats .

6. Set up a Bluetooth connection when not support setting the baud rate , the name by AT commands , pairing password , power-down save parameter settings . After the Bluetooth connection is automatically switched to transparent mode

7 , small size (2.7cm * 1.3cm), factory chip production , quality assurance patch .

PC, Bluetooth host , most Bluetooth phones , PDA, PSP and other intelligent terminal 8 , the link from the machine, from a function with a variety of Bluetooth-enabled pairing between slaves can not be paired

Setting procedure -based module:

1,PIO11 beenSet high, then the power module .

2, After power module into theATCommand response status .

3HyperTerminal or other serial tool , set the baud rate38400Data bits8Bits, stop bits1Bits, no parity,No flow control.

4, Serial send characters“AT + ROLE = 1 \ r \ n”Successful return“OK \ r \ n”, Among themrnA carriage return line feed.

5,PIOSet low , re-power , module -based module , automatic search from module to establish a connection .

Gas : Smoke
Detection range : 300 to 10000ppmm
Characteristics of Gas : 1000ppmm isobutane
Sensitivity : R in air / Rin typical gas5
Sensing Resistance : 1K to 20K in 50ppm toluene
Response time : 10s
Recovery time : 30s
Heating resistance : 31 ± 3
Heating current : 180mA
Heating voltage : 5.0V ± 0.2V
Heating power : 900mW
Measuring voltage : 24V
Working conditions Ambient temperature : -20 ° ~ + 55 °
Humidity : 95% RH
Environmental oxygen content : 21%
Storage temperature : -20 ° ~ + 70 °
Humidity : 70% RH



Brand Name



Gas Sensor


Digital Sensor

Output Model Category

Analog Sensors


Gas Sensors

Sensor category

Thermal sensors



16 reviews for 1pcs MQ-2 MQ2 Smoke Gas LPG Butane Hydrogen Gas Sensor Detector Module for arduino

  1. V***v


  2. S***e

    thank u

  3. P***r

    Product works as advertised, came sealed and was delivered faster than expected.

  4. M***a

    Perfect and accuare

  5. V***v

    Проверил датчики, они работают. Качество изготовления хорошее, единственное не помыто. Рекомендую продавца.

  6. G***U

    product ok. fast delivery. not tested yet.

  7. Customer

    отличное качество, рекомендую!

  8. S***n

    Fast delivery and good quality.

  9. E***e

    prezzo basso ed ottimi, utili per vari progetti

  10. Customer


  11. P***r

    wszystko ok!! polecam gorąco

  12. Customer

    its okay

  13. K***k

    merci vendeur 40jours apres l’achat

  14. P***v

    пришло быстро ,датчик рабочий

  15. M***r

    Merci pour votre rapide livraison

  16. Customer


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