MQ-Series Gas Sensor Modules: MQ-2, MQ-3, MQ-7 or MQ-135

Explore gas-sensing inputs in a microcontroller project with an MQ-series sensor module. This listing offers MQ-2, MQ-3, MQ-7 and MQ-135 variants, each intended for different sensing applications.

Match the sensor variant to your prototype

• ✅ ✅ Select the sensor for the target gas — the model choice matters; MQ-2 is described for smoke and the variants are not interchangeable.
• ✅ ✅ Connect a sensor output to your circuit — the module provides an analogue output as listed.
• ✅ ✅ Choose only the model you need — the selected variant is one sensor module.

Use the module for experimentation or a prototype gas-monitoring circuit. The MQ-2 specification lists a 5V heater supply and a stated detection range of 300–10,000 ppm for its listed target; those figures should not be applied to the other MQ variants.

This is a development sensor module, not a certified safety alarm. Sensor response depends on calibration, warm-up and operating conditions. Confirm the chosen sensor’s datasheet and circuit requirements before relying on readings.

Specifications: MQ-2, MQ-3, MQ-7 or MQ-135 option; analogue output; MQ-2 heater supply listed as 5V. Detection characteristics depend on the selected model.

Choose the sensor variant that matches your project requirements.