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Arduino Sample Code
MQ-2 for Methane, Butane, LPG, smoke.
MQ-3 for Methane, Butane, LPG, smoke.
MQ-4 for Methane, CNG Gas
MQ-5 for Natural gas, LPG
MQ-6 for LPG, butane gas
MQ-7 for Carbon Monoxide
MQ-8 for Hydrogen Gas
MQ-9 for Carbon Monoxide, flammable gasses.
MQ-135 for Benzene, Alcohol, smoke.
MQ-2
Sensitive for Methane, Butane, LPG, smoke.
This sensor is sensitive for flamable and combustible gasses.
The heater uses 5V.
The MQ-2 at seeed: http://www.seeedstudio.com/wiki/Grove_-_Gas_Sensor%28MQ2%29
Search for datasheet: http://duckduckgo.com/?q=%22mq-2%22+gas+sensor+filetype%3Apdf
MQ-3
Sensitive for Alcohol, Ethanol, smoke
The heater uses 5V
The Arduino blog about the "breathalyzer" using a MQ-3 : http://arduino.cc/blog/2010/09/23/arduino-breathalyzer-calibrating-the-mq-3-alcohol-sensor/
The MQ303A (also on this page) is like this sensor, but uses a lower heater voltage.
Search for datasheet: http://duckduckgo.com/?q=%22mq-3%22+gas+sensor+filetype%3Apdf
MQ-4
Sensitive for Methane, CNG Gas
The heater uses 5V.
Search for datasheet: http://duckduckgo.com/?q=%22mq-4%22+gas+sensor+filetype%3Apdf
MQ-5
Sensitive for Natural gas, LPG
The heater uses 5V.
The MQ-5 at seeed: http://www.seeedstudio.com/wiki/Electronic_brick_-_Gas_sensor%28MQ5%29 and http://www.seeedstudio.com/wiki/Gas_Sensor_-_MQ5
Search for datasheet: http://duckduckgo.com/?q=%22mq-5%22+gas+sensor+filetype%3Apdf
MQ-6
Sensitive for LPG, butane gas
The heater uses 5V.
The MQ-6 at seeed: http://www.seeedstudio.com/wiki/Electronic_brick_-_Gas_sensor%28MQ6%29
The MQ306A (also on this page) is like this sensor, but uses a lower heater voltage.
Search for datasheet: http://duckduckgo.com/?q=%22mq-6%22+gas+sensor+filetype%3Apdf
MQ-7 一氧化碳感測器模組
Sensitive for Carbon Monoxide
The heater uses an alternating voltage of 5V and 1.4V.
A library for the MQ-7 : http://thesis.jmsaavedra.com/prototypes/software/mq-7-breakout-arduino-library/
The MQ307A (also on this page) is like this sensor, but uses a lower heater voltage.
Search for datasheet: http://duckduckgo.com/?q=%22mq-7%22+gas+sensor+filetype%3Apdf
MQ-8
Sensitive for Hydrogen Gas
The heater uses 5V.
Search for datasheet: http://duckduckgo.com/?q=%22mq-8%22+gas+sensor+filetype%3Apdf
MQ-9
Sensitive for Carbon Monoxide, flammable gasses.
The heater uses an alternating voltage of 5V and 1.5V. It depends on the gases how to use that alternating voltage. If only Carbon Monoxide is tested, the heater can be set at 1.5V.
The MQ309A (also on this page) is like this sensor, but uses a lower heater voltage.
Search for datasheet: http://duckduckgo.com/?q=%22mq-9%22+gas+sensor+filetype%3Apdf
MQ131
Sensitive for Ozone
The heater uses 6V.
The load-resistor is 100k...200k, which is a lot higher than for other sensors. This sensor is also very sensitive. It measures in ppb (parts per billion) where other sensors measure in ppm (parts per million).
Search for datasheet: http://duckduckgo.com/?q=%22mq131%22+gas+sensor+filetype%3Apdf
MQ135
For Air Quality
Sensitive for Benzene, Alcohol, smoke.
The heater uses 5V.
An example how to use it: http://wiring.org.co/learning/basics/airqualitymq135.html
An example with calculation of the CO2 value: http://davidegironi.blogspot.it/2014/01/cheap-co2-meter-using-mq135-sensor-with.html
Search for datasheet: http://duckduckgo.com/?q=%22mq135%22+gas+sensor+filetype%3Apdf
MQ136
Sensitive for Hydrogen Sulfide gas.
The heater uses 5V.
Search for datasheet: http://duckduckgo.com/?q=%22mq136%22+gas+sensor+filetype%3Apdf
MQ137
Sensitive for Ammonia.
The heater uses 5V.
Search for datasheet: http://duckduckgo.com/?q=%22mq137%22+gas+sensor+filetype%3Apdf
MQ138
Sensitive for Benzene, Toluene, Alcohol, Acetone, Propane, Formaldehyde gas, Hydrogen gas.
The heater uses 5V.
Search for datasheet: http://duckduckgo.com/?q=%22mq138%22+gas+sensor+filetype%3Apdf
MQ214
Sensitive for Methane, Natural gas.
The heater uses 6V.
Search for datasheet: http://duckduckgo.com/?q=%22mq214%22+gas+sensor+filetype%3Apdf
MQ216
Sensitive for Natural gas, Coal gas.
Search for datasheet: http://duckduckgo.com/?q=%22mq216%22+gas+sensor+filetype%3Apdf
MQ303A
Sensitive for Alcohol, Ethanol, smoke (just like the MQ-3)
The heater uses 0.9V
An example for the MQ302A http://insapio.com/2011/12/27/mq3-or-mq303a-alcohol-sensor/
It detects the same gasses as the MQ-3, but uses a lower heater voltage.
Search for datasheet: http://duckduckgo.com/?q=%22mq303a%22+gas+sensor+filetype%3Apdf
MQ306A
Sensitive for LPG, butane gas
The heater uses 0.9V.
It detects the same gasses as the MQ-6, but uses a lower heater voltage.
Search for datasheet: http://duckduckgo.com/?q=%22mq306a%22+gas+sensor+filetype%3Apdf
MQ307A
Sensitive for Carbon Monoxide
The heater uses an alternating voltage of 0.2V and 0.9.
It detects the same gasses as the MQ-7, but uses a lower heater voltage.
Search for datasheet: http://duckduckgo.com/?q=%22mq307a%22+gas+sensor+filetype%3Apdf
MQ309A
Sensitive for Carbon Monoxide, flammable gasses.
The heater uses an alternating voltage of 0.2V and 0.9V. It depends on the gases how to use that alternating voltage.
It detects the same gasses as the MQ-9, but uses a lower heater voltage.
Search for datasheet: http://duckduckgo.com/?q=%22mq309a%22+gas+sensor+filetype%3Apdf
MG811
Sensitive for Carbon Dioxide (CO2).
The heater uses 6V.
The signal from this gas sensor can be connected to the Arduino, but it's better to amplifly the signal with a OpAmp.
An example of this sensor (without an OpAmp) : http://itp.nyu.edu/physcomp/sensors/Reports/MG811
Search for datasheet: http://duckduckgo.com/?q=%22mg811%22+gas+sensor+filetype%3Apdf
AQ-104
For air quality
Search for datasheet: http://duckduckgo.com/?q=%22aq-104%22+gas+sensor+filetype%3Apdf
AQ-2
Sensitive for Flamable gasses, smoke
Search for datasheet: http://duckduckgo.com/?q=%22aq-2%22+gas+sensor+filetype%3Apdf
AQ-3
Sensitive for Alcohol, Benzine
Search for datasheet: http://duckduckgo.com/?q=%22aq-3%22+gas+sensor+filetype%3Apdf
AQ-7
Sensitive for Carbon Monoxide
Search for datasheet: http://duckduckgo.com/?q=%22aq-7%22+gas+sensor+filetype%3Apdf
Source: https://playground.arduino.cc/Main/MQGasSensors
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