Gas Sensors - MQ Series, MG811, CO, NO2, H2S Detection

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Passive Buzzer Module 3.3V-5V DC

Filamet is really good

Really good filament with no moisture and printed perfectly

The module is working fine i wished you guys had a soldered one and i think you missed the anntena for this module so make sure to provide one with this module

Delivery and quality

Delivery in one day excellent
Product quality is good

Good Product

Good product and fast courier services. It was good experience ordering from Robocraze

Gas Sensors Price List	Cost
MQ-9 Gas Sensor Module	Rs.145
MQ-136 Hydrogen Gas Sensor	Rs.2129
MQ-3 Gas Sensor Module	Rs.116
MQ-8 Gas Sensor Module	Rs.110
MQ-5 Gas Sensor Module	RS.100
MQ-7 Gas Sensor Module	Rs.127
MQ-135 gas sensor Module	Rs.117
MQ-2 Gas Sensor Module	Rs.102
MQ-137 NH3 Gas Sensor Module	Rs.2156
MQ-6 Gas Sensor Module	Rs.115
MQ-4 Natural Gas Sensor Module	Rs.102
MG811 Carbon Dioxide Sensor	Rs.3306
MQ131 Ozone Gas Detection Module	Rs.1827
MQ-2 Gas Sensor	Rs.109

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Gas Sensors for Air Quality Monitoring, Safety & IoT Projects

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MQ Series Gas Sensor Module to Arduino (Analog Output)

MG811 CO₂ Sensor Module to Arduino

Fermion I²C Gas Sensor to Arduino

Fermion / MQ (via ADC) to Raspberry Pi

Arduino Example Code – Read MQ Gas Sensor

Raspberry Pi Example Code – Read MQ via MCP3008 (Python)

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Frequently Asked Questions

1. Are gas detection sensors compatible with Arduino?

The output is an analog signal and can be read with an analog input of the Arduino. The MQ-2 Gas Sensor module is useful for gas leakage detecting in home and industry. It can detect LPG, i-butane, propane, methane, alcohol, hydrogen and smoke.

2. Where should Gas Detection Sensors be located?

Gas detectors should be placed near the floor for vapors or gases three or four times heavier than air. For the detection of lighter than air gases, sensors should be fitted near the roof or ceiling

3. What are the types of gas sensors?

Gas detection sensors are also called Gas Detectors. These sensors are electronic devices that detect and identify different types of gases. They are commonly used to detect toxic or explosive gasses and measure gas concentration.

4. How does a gas sensor work?

The working of a this sensor depends upon the concentration of the gas. Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensors, which can be measured as output voltage.

5. How does a smoke sensor module work?

Smoke alarms have a small amount of radioactive material between two electrically charged plates, which ionizes the air and causes current to flow between the plates. When smoke enters the chamber, it disrupts the flow of ions, thus reducing the flow of current and activating the alarm.

6. What are MQ2 and MQ3 gas detection sensors?

7. What is the use of gas detectors?

8. What types of gases can these sensors detect?

9. Are these sensors compatible with Arduino and Raspberry Pi?

Yes. These modules are built for hobby and DIY electronics, and many support analog outputs (that microcontrollers like Arduino can read) or digital trigger outputs. This makes them quite doable with both Arduino boards and Raspberry Pi setups (using its GPIO and ADC or external ADC modules).

10. What is the detection range and accuracy of these sensors?

11. Can these sensors be used for safety monitoring and IoT projects?

Absolutely. These sensors are well suited for applications like gas-leak alarms, home safety systems, industrial IoT monitoring, air quality dashboards and environmental sensing. They integrate well into systems that alert users or send data when certain gases exceed thresholds.

12. Do these modules require calibration before use?

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