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Arduino Gas Sensor Module MQ-2 Smoke + LPG + CO

The sensor module uses an MQ-2 GAS sensor as sensitive components and has protection resistors on the board board. GAS sensor MQ-2 can be used to detect LPG, i-butane, propane, methane, alcohol, hydrogen and smoke. This tool It can be used in gas leakage detecting equipments in family and industry. The resistance of the sensitive component changes due to changes in the concentration of the target gas.

MQ-2 Gas Sendor  Module

MQ-2 Gas Sensor Module

This module is controlled by a micro control Arduino, which will detect any changes that occur in the PIN Analog A0. The detection results then in respond to control the Voice, Relay, or Lights Siren. gas changes

The sensor module uses an MQ-2 GAS sensor as sensitive components and has protection resistors on the board board. GAS sensor MQ-2 can be used to detect LPG, i-butane, propane, methane, alcohol, hydrogen and smoke. This tool It can be used in gas leakage detecting equipments in family and industry. The resistance of the sensitive component changes due to changes in the concentration of the target gas.

MQ-2 Gas Sensor

MQ-2 Gas Sensor Wire

This module is controlled by a micro control Arduino, which will detect any changes that occur in the PIN Analog A0. The detection results then in respond to control the Voice, Relay, or Lights Siren. gas changesur
in the PIN Analog A0. The detection resu

Standard Working Condition
Symbol Parameter Name Technical Condition Remarks
VC Circuit voltage 5V±0.1 AC or DC
VH Heating voltage 5V±0.1 AC or DC
RL Load resistance adjustable
RH Heater resistance 33Kohm±5% Room temperature
PH Heating consumption Less than 800mW
Environment Condition
Symbol Parameter Name Technical Condition Remarks
TO Operating Temp. -20°C-50°C
TS Storage Temp. -20°C-70°C
RH Relative Humidity <95%
O2 Oxygen Concentration 21%(standard condition) Oxygen concentration can affect sensitivity Minimum value is 2%
Sensitivity Characteristics
Symbol Parameter Name Technical Condition Remarks
RS Sensor Resistance 3Kohm-30Kohm (1000ppm iso-butane) Detecting concentration scope:
200ppm-5000ppm LPG and propane
300ppm-5000ppm butane
5000ppm-20000ppm methane
300ppm-5000ppm H2
100ppm-2000ppm Alcohol
α (3000ppm/1000ppm iso-butane) Concentration slope rate ≤0.6
Standard detecting Condition Temp.: 20°C±2°C VC: 5V±0.1
Humidity:65%±5% VH:5V±0.1
Preheating Time Over 24 hours
Resourceslts then in respond to control the Voice, Relay, or Lights Siren. gas changes

Theory

The protection resistor (4.7Kohms) and the adjustable (0-50Kohms) are in serial which forms a load resistor RL (4.7-54.7Kohms). The sensor’s resistance RS and RL forms a voltage divider. The output voltage on the signal pin could be read by Arduino or MCU via ADC. Given a value of RL , Power Supply Voltage, and output voltage, RS could be derived. Based on the chart provided in the MQ-2 datasheet, RS in clean air under given temperature and humidity is a constant,which is the “initial” resistance of the sensor named RO. RO of the resistor could be derived from RS. The main job of the calibration is to calculate the RO by sampling and averaging the readings when the module is placed in the clean air. Once the RO is derived, the concentration of target gas could be calculated by using the RS/RO ratio as the input. To achieve more accuracy, a segmented look-up table should be used. However, in the demonstration, a linear formula is used as an approximation to the original curve.

Source Code:

 

Demo output as the sensor approaches a lit cigarette

Demo output as the sensor approaches a lit cigarette

Demo output as the sensor approaches a lit cigarette

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3 Responses to “Arduino Gas Sensor Module MQ-2 Smoke + LPG + CO”

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