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Grove - Gas Sensor (MQ3)

Version

：

1.0

Release date

：

9/20/2015

Wiki:

http://www.seeedstudio.com/wiki/Grove_-_Gas_Sensor(MQ3)

Bazaar:

http://www.seeedstudio.com/depot/Grove-Gas-SensorMQ3-p-1418.html

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Summary of Contents for Grove MQ3

Page 1: ...1 Grove Gas Sensor MQ3 Version 1 0 Release date 9 20 2015 Wiki http www seeedstudio com wiki Grove_ _Gas_Sensor MQ3 Bazaar http www seeedstudio com depot Grove Gas SensorMQ3 p 1418 html ...

Page 2: ...2 Document Revision History Revision Date Author Description 1 0 Sep 21 2015 Victor He Create file ...

Page 3: ...ory 2 1 Introduction 2 2 Features 3 3 Application Ideas 4 4 Mechanic Dimensions 5 5 Usage 6 5 1 Suggest Reading for Starter 6 5 2 Hardware Installation 6 5 3 How to use 7 6 Support 10 7 Version Tracker 11 8 Resources 12 9 Licensing 13 ...

Page 4: ...ision of Seeed Technology Inc this manual has been compiled and published which covered the latest product description and specification The content of this manual is subject to change without notice Copyright The design of this product including software and its accessories is under tutelage of laws Any action to violate relevant right of our product will be penalized through law Please conscious...

Page 5: ...dule is useful for gas leakage detecting in home and industry It can detect Alcohol Benzine CH4 Hexane LPG CO Based on its fast response time Measurements can be taken as soon as possible Also the sensitivity can be adjusted by the potentiometer ...

Page 6: ...3 2 Features High sensitivity to alcohol and small sensitivity to Benzine Stable and long life Fast response and High sensitivity ...

Page 7: ...4 3 Application Ideas They are suitable for alcohol checker Breathalyser Toys ...

Page 8: ...tems Parameter name Min Type Max Unit System Characteristics VCC Working Voltage 4 9 5 5 1 V PH Heating consumption 0 5 750 mW RL Load resistance can adjust RH Heater resistance 33 Ω Rs Sensing Resistance 1 8 MΩ Scope Detecting Concentration 0 05 10 mg L ...

Page 9: ...t of Base Shield however you can also connect Gas sensor to Arduino without Base Shield by jumper wires Arduino UNO Gas Sensor 5V VCC GND GND NC NC Analog A0 SIG You can gain the present voltage through the SIG pin of sensor The higher the concentration of the gas the bigger the output voltage of the SIG pin Sensitivity can be regulated by rotating the potentiometer Please note the best preheat ti...

Page 10: ...alue sensorValue analogRead A0 sensorValue sensorValue 100 0 sensor_volt sensorValue 1024 5 0 RS_air 5 0 sensor_volt sensor_volt omit RL R0 RS_air 70 0 The ratio of RS R0 is 70 in a clear air Serial print sensor_volt Serial print sensor_volt Serial println V Serial print R0 Serial println R0 delay 1000 Then open the monitor of Arduino IDE you can see some data are printed write down the value of R...

Page 11: ...ensorValue 1024 5 0 RS_gas 5 0 sensor_volt sensor_volt omit RL Replace the name R0 with the value of R0 in the demo of First Test ratio RS_gas R0 ratio RS R0 Serial print sensor_volt Serial println sensor_volt Serial print RS_ratio Serial println RS_gas Serial print Rs R0 Serial println ratio Serial print n n delay 1000 Now we can get the concentration of gas from the below figure ...

Page 12: ...imum concentration we can test is 0 1mg L and the maximum is 10mg L However we can t provide a formula because the relation between ratio and concentration is nonlinear But also we can convert mg L to ppm it may be convenient for us to watch the value ...

Page 13: ...10 6 Support Ask questions on Seeed forum ...

Page 14: ...11 7 Version Tracker Revision Descriptions Release v0 9b Initial public release 16 Aug 2011 v1 4 Replace some components 27 Aug 2014 ...

Page 15: ...12 8 Resources File Gas Sensor Eagle files zip File Gas Sensor Schematic pdf File MQ 3 pdf ...

Page 16: ...13 9 Licensing This documentation is licensed under the Creative Commons Attribution ShareAlike License 3 0 Source code and libraries are licensed under GPL LGPL see source code files for details ...

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