{"title":"Gravity: Arduino CO/Combustible Gas Sensor (MQ9)","handle":"gravity-arduino-co-combustible-gas-sensor-mq9","url":"/products/gravity-arduino-co-combustible-gas-sensor-mq9","description":"The Gravity MQ-9 gas sensor detects carbon monoxide (CO) and combustible gases including methane and propane. It uses a semiconductor SnO2 sensing element that cycles between high and low temperatures — detecting CO at low temperature (1.5V) and combustible gases at high temperature (5.0V).\n\nWith a DFRobot Gravity interface, the sensor connects directly to any Arduino analog input for plug-and-play operation. Sensitivity is adjustable via an onboard potentiometer, and the analog output is proportional to gas concentration.\n\nKey Features\n\n\nDual Gas Detection – Detects both CO (10–1,000 ppm) and combustible gases (100–10,000 ppm)\n\nHigh Sensitivity – Particularly responsive to methane, propane, and carbon monoxide\n\nGravity Interface – Plug-and-play analog connection to Arduino boards\n\nAdjustable Sensitivity – Onboard potentiometer for fine-tuning detection thresholds\n\n5V Power Supply – Standard voltage for easy integration\n\nCompact Size – 36.4 × 26.6 mm (1.43\" × 1.05\")\n\n\nIdeal For\n\nDomestic gas leakage detectors\nIndustrial gas monitoring systems\nPortable gas detection devices\nAir quality monitoring projects\n\n\nPackage Contents\n\n1× MQ-9 CO/Combustible Gas Sensor\n1× Gravity Analog Cable\n\n\nResources\n\nDFRobot Wiki – MQ-9 Gas Sensor\nMQ-9 Datasheet (PDF)\nSchematic (PDF)\n","vendor":"DFRobot","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":11399,"title":"Default Title","sku":"DF-SEN0134","price":12.72,"on_sale":false,"in_stock":true,"available_quantity":105,"option1":"Default Title"}]}