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- Operating Voltage is +5V.
- Used to detect LPG, Alcohol, Propane, Hydrogen, CO, and methane.
- Used as a Digital or analog sensor.
- Sensitivity of Digital pin can be varied using the potentiometer.
- Have a long life.
- It has a Simple drive circuit.
MQ-2 Gas Sensor Module
The MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module is useful for gas leakage detection (home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke, or Propane. Due to its high sensitivity and fast response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by the potentiometer
This MQ-2 Smoke and gas detector module works with 5V power, making it easy to connect to most projects. You can get two types of readings from it—an analog output, which gives you a range of values (0V to 5V) based on the gas level, or a digital output that’s either on (5V) or off (0V).
Check out the entire range of Gas Sensors.
Also explore the exclusive collection for Sensors.
Applications:
- Safety of home
- Control of air quality
- Measurement of gas level
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Package Includes:
- 1 x MQ2 Gas Sensor Module
MQ2 Gas Sensor Specifications
| Model | MQ2 Gas Sensor |
| Operating Voltage | 5V (DC) |
| Analog Output Voltage | 0V to 5V |
| Digital Output Voltage | 0V or 5V (TTL Logic) |
| Dimensions | 3.6 x 2 x 1 cms |
| Weight | 5 grams |
1. What are gas sensors? How do they work?
- Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration. Gas sensor detect the presence or concentration of gases in the atmosphere. Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensor, which can be measured as output voltage. Based on this voltage value the type and concentration of the gas can be estimated.
2. How to adjust the sensitivity of MQ-2 gas sensor?
- In order to adjust the sensitivity of this sensor for the particular type of gas, you need to keep this sensor in the particular gas type you want to detect. Now we have to rotate the potentiometer on the sensor.
- Rotate it till the Red LED on the sensor gets ON. If we have to increase the sensitivity, rotate it clockwise, and if we have to decrease the sensitivity we have to rotate it anticlockwise.
- When we are rotating this potentiometer basically we are adjusting the threshold value of the sensor. The comparator on this board is constantly checking the threshold value.
- Once this threshold gets crossed the digital pin goes high and the LED will turn on. In this way calibrate your sensor, it may take some time but once you calibrate it, it will give you accurate readings.
