MQ-2 Gas Sensor Module For H2, LPG, CH4, CO, Smoke or Propane Detector Module - Buy Online in India

Package Includes:

• 1 x MQ2 Gas Sensor Module

MQ2 Gas Sensor Specifications

1. How to test MQ2 gas sensor?

To test the module, connect it to a microcontroller and apply power. Introduce a small amount of smoke or LPG near the sensor element. If the analog or digital output value changes in response, you can confirm the MQ2 gas sensor is working properly.

2. How to calibrate MQ2 gas sensor?

Proper calibration begins with allowing the sensor to preheat for several hours to reach a stable baseline reading. Afterward, you can expose it to a target gas and set a threshold in your code to fine-tune its sensitivity. This process ensures your gas detector sensor provides more reliable and consistent results.

3. How to connect MQ2 gas sensor to Arduino?

To connect the sensor to your Arduino, simply wire VCC to 5V, GND to ground, and the analog output (A0) pin to one of the Arduino's analog inputs. With this setup and some simple code, you can build your own gas leak sensor. This configuration is perfect for creating a simple LPG gas detector sensor for safety applications.

4. How to connect MQ2 gas sensor to NodeMCU?

To interface the MQ-2 gas sensor with a NodeMCU, connect the sensor's VCC pin to a 3.3V or 5V source and its GND pin to ground. Then, wire the sensor's analog output to NodeMCU’s analog pin (usually A0) to read its values. This simple connection allows you to create a WiFi-enabled gas detection system.

5. How to use gas sensor with Arduino?

Using the MQ2 gas sensor with an Arduino involves reading the analog voltage from the sensor's output pin. You can program the Arduino to monitor these readings and trigger an alarm when they exceed a certain threshold. This setup allows you to create a functional gas leak sensor capable of detecting smoke or LPG.

6. How to calculate gas sensor readings?

First, you need to read the analog value from the sensor’s A0 pin and convert it to a voltage. To get accurate readings, you must then use this voltage along with the sensor's resistance ratio and refer to the characteristic curves in the datasheet. This allows you to estimate the gas concentration in ppm and turn your project into a functional gas detector sensor.

7. How to choose the sensing material in gas sensors?

The choice of sensing material is critical for the performance of gas sensors, as it determines which gases can be detected. This MQ-2 model uses tin dioxide (SnO2) because of its high sensitivity to a wide range of combustible gases. This makes it an effective and affordable choice for a general-purpose LPG gas sensor.

8. How to connect 2 gas sensors to Arduino?

To connect 2 gas sensors to a single Arduino, wire their power and ground pins in parallel. The key is to connect the output of each sensor to separate Arduino analog pins, such as A0 and A1. This allows your code to read each one independently, creating a system with multiple gas leak sensors for wider area coverage.

• Datasheet

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