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  1. #1
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    MQ2 Combustible Gas sensor circuit

    Hi,

    i want to built a Combustible gas sensor circuit using the 6 pin gas sensor MQ2 (winsen)... to interface with microcontroller... now i only want to operate a relay without using a microcontroller...

    I dont know how to connect the pins... if any one have schematic please help.....




    Thankyou.

    •   Alt11th June 2011, 09:05

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    Re: MQ2 Combustible Gas sensor circuit

    Read the datasheet:
    The sensor need to be put 2 voltage:
    heater voltage(VH) and test voltage(VC).
    VH used to supply certified working temperature to the sensor, while VC used to detect voltage (VRL) on load resistance (RL)whom is in series with sensor. The sensor has light polarity, Vc need DC
    power. VC and VH could use same power circuit with precondition to assure performance of sensor. In order to make the sensor with better performance,
    suitable RL value is needed: Power of Sensitivity body(Ps):
    Ps=Vc2×Rs/(Rs+RL)2
    Vh=5V

    ---------- Post added at 12:17 ---------- Previous post was at 12:14 ----------







    2 members found this post helpful.

    •   Alt11th June 2011, 12:17

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  3. #3
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    Re: MQ2 Combustible Gas sensor circuit

    i want circuit which uses IC HA17358B ( dual opamp) and IC HEF40106B..... please help.....



    •   Alt12th June 2011, 12:56

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  4. #4
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    Re: MQ2 Combustible Gas sensor circuit

    check this 1
    Accident-prevention-and-security-system-for-Automobiles3_0.jpg

    it may help u but the sensor is MQ303A



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