{"product_id":"mq-9-gas-sensor-module-for-co-methane-lpg-detection","title":"MQ-9 Gas Sensor Module for CO, Methane \u0026 LPG Detection","description":"\u003ch1\u003eMQ-9 Gas Sensor Module\u003c\/h1\u003e\n\u003cp\u003eThe MQ-9 gas sensor module detects carbon monoxide (CO), methane (CH₄), and liquefied petroleum gas (LPG). It’s widely used in air quality monitors, gas leak alarms, and industrial safety equipment. The module outputs both analog voltage and a digital TTL signal, making it easy to integrate with microcontrollers for threshold-based alerts or concentration monitoring.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGas Detected\u003c\/td\u003e\n\u003ctd\u003eCO, Methane, LPG\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDetection Range\u003c\/td\u003e\n\u003ctd\u003e10–1000 ppm CO; 300–10,000 ppm Methane\/LPG\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e5 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eAnalog (0–5 V) and Digital (TTL)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePreheat Time\u003c\/td\u003e\n\u003ctd\u003e60–120 seconds (initial)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCarbon monoxide leak alarm with buzzer and LED indicators\u003c\/li\u003e\n  \u003cli\u003eMethane leak detector for kitchen or basement safety\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/pm2-5-air-quality-monitor-kit\"\u003ePortable air quality monitor with an LCD or OLED display\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-flood-and-gas-combined-home-alert\"\u003eSmart home gas alert system using an ESP8266 and cloud notifications\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe module works with any 5V microcontroller board including Arduino Uno, Nano, and Mega. It can also interface with 3.3V boards like ESP8266, ESP32, or Raspberry Pi when using a logic level shifter or voltage divider for the digital output. The analog output requires an ADC input on the host board.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 5V, GND to ground, AOUT to an analog input (e.g., A0), and DOUT to a digital pin. The heater draws around 150 mA during the high-heat cycle, so avoid powering the module directly from a microcontroller’s 5V pin; use an external regulated supply.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, the MQ-9 module operates at 5V and connects directly to any Arduino board. Use an analog pin to read gas concentration and a digital pin for the threshold alarm.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I calibrate the sensor?\u003c\/summary\u003e\u003cp\u003eAllow it to preheat for at least 2 minutes. For the digital output, adjust the onboard potentiometer until the threshold triggers in clean air. For analog accuracy, expose the sensor to a known concentration and map the voltage readings.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan it detect smoke from a fire?\u003c\/summary\u003e\u003cp\u003eThe sensor is optimized for CO, methane, and LPG, not particulate smoke. It may respond weakly to combustion gases present in smoke, but it is not a substitute for a dedicated smoke detector.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445108924781,"sku":"CDN-0398","price":110.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_0a5635ad-12e9-4543-8269-33536b67ad8f.jpg?v=1781513348","url":"https:\/\/compoden.com\/products\/mq-9-gas-sensor-module-for-co-methane-lpg-detection","provider":"Compoden","version":"1.0","type":"link"}