{"id":53406,"date":"2017-04-13T12:25:20","date_gmt":"2017-04-13T11:25:20","guid":{"rendered":"https:\/\/www.microplanet.ma\/produit\/module-capteur-dalcool-ethanol-mq3\/"},"modified":"2026-10-19T18:55:27","modified_gmt":"2026-10-19T18:55:27","slug":"mq-3-alcohol-vapour-sensor-module","status":"publish","type":"product","link":"https:\/\/www.microplanet.ma\/en\/produit\/mq-3-alcohol-vapour-sensor-module\/","title":{"rendered":"MQ-3 Alcohol Vapour Sensor Module"},"content":{"rendered":"<h3>MQ-3 Alcohol Vapour Sensor Module<\/h3>\n<p>This module uses an MQ-3-family semiconductor sensor to respond to alcohol vapour, including ethanol vapour. It is intended for electronics experiments and prototypes. Its output depends on the sensor and breakout version, warm-up, calibration, temperature, humidity, airflow and other vapours present.<\/p>\n<h4>\ud83d\udd27 Product features<\/h4>\n<ul>\n<li>Sensor type: semiconductor gas sensor (MQ-3 family)<\/li>\n<li>Target response: alcohol vapour \/ ethanol vapour<\/li>\n<li>Adjustable sensitivity: provided on some breakout versions; verify the supplied board<\/li>\n<li>Signal indicator: present on some board versions<\/li>\n<li>Output voltage generally changes with the sensor response; it is not a direct, calibrated alcohol concentration reading<\/li>\n<\/ul>\n<p>For reference only, Winsen\u2019s MQ-3B sensor documentation specifies a 25\u2013500 ppm alcohol test range, a 5.0 V heater supply and preheating over 48 hours under its stated test conditions. The product is listed as MQ3, so confirm the exact sensor marking and module circuit before applying MQ-3B figures to the supplied unit.<\/p>\n<h4>\u2699\ufe0f Operating notes<\/h4>\n<p>The sensing element is heated and needs time to stabilize. Readings from a new or recently powered sensor can drift; follow the actual sensor\u2019s documentation, allow adequate warm-up and calibrate in controlled conditions. Different gases and vapours can affect the reading, so the output alone cannot reliably identify ethanol or determine a precise concentration.<\/p>\n<h4>\ud83d\udd0c Typical module connection<\/h4>\n<p>Connector labels vary by board. A common breakout provides VCC, GND, analog output (AO) and a threshold-comparator digital output (DO), but verify the actual markings. MQ-3-family heaters commonly require a stable 5 V supply and can draw substantial current compared with a microcontroller GPIO. Power the heater from an appropriate supply; share ground with the controller. Check the output level before connecting AO or DO to a 3.3 V-only input, and use level shifting or protection where necessary.<\/p>\n<h4>\ud83d\udca1 Suitable uses<\/h4>\n<ul>\n<li>Demonstrating gas-sensor response in a supervised lab<\/li>\n<li>Microcontroller analog-input and comparator projects<\/li>\n<li>Non-critical alcohol-vapour trend experiments<\/li>\n<\/ul>\n<p><strong>Important limitation:<\/strong> this module is not a breathalyzer, blood-alcohol estimator, medical instrument, legal evidence device, certified workplace monitor or life-safety alarm. Do not use it to assess intoxication, decide whether someone may drive, or protect people from hazardous vapours. Use certified instruments for those purposes and never test by deliberately creating a hazardous vapour concentration.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MQ-3 semiconductor sensor module for alcohol-vapour response experiments, with adjustable sensitivity on some board versions. Requires warm-up and calibration; it is not a breathalyzer or certified safety device.<\/p>\n","protected":false},"featured_media":53407,"template":"","meta":[],"product_brand":[],"product_cat":[314,316],"product_tag":[],"class_list":["post-53406","product","type-product","status-publish","has-post-thumbnail","product_cat-developpement-en","product_cat-modules-capteurs-en","first","instock","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MQ-3 Alcohol Vapour Sensor Module | MicroPlanet<\/title>\n<meta name=\"description\" content=\"MQ-3 alcohol-vapour sensor module for electronics experiments. 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