{"id":53448,"date":"2017-04-13T12:28:46","date_gmt":"2017-04-13T11:28:46","guid":{"rendered":"https:\/\/www.microplanet.ma\/?post_type=product&#038;p=53448"},"modified":"2026-10-19T19:00:58","modified_gmt":"2026-10-19T19:00:58","slug":"mq135-air-quality-gas-sensor-module","status":"publish","type":"product","link":"https:\/\/www.microplanet.ma\/en\/produit\/mq135-air-quality-gas-sensor-module\/","title":{"rendered":"MQ135 Air-Quality Gas Sensor Module"},"content":{"rendered":"<h3>MQ135 Air-Quality Gas Sensor Module<\/h3>\n<p>This module uses an MQ135 tin-dioxide (SnO\u2082) semiconductor gas sensor. Its resistance changes in response to certain gases and vapours. It is suitable for demonstrations and experimental trend monitoring after warm-up and calibration, but it is not a selective analyzer of individual pollutants.<\/p>\n<h4>\ud83d\udd27 Manufacturer reference information<\/h4>\n<ul>\n<li>Sensor type: semiconductor (SnO\u2082)<\/li>\n<li>Manufacturer-listed sensitivities include ammonia, sulfide and benzene-series vapours, as well as smoke and other gases<\/li>\n<li>Manufacturer-stated test range: 10\u20131,000 ppm for specified gases such as ammonia, toluene, hydrogen and smoke under stated test conditions<\/li>\n<li>Heater and circuit supply: 5.0 V nominal in the manufacturer\u2019s standard test circuit<\/li>\n<li>Heater consumption: up to approximately 950 mW<\/li>\n<li>Initial preheating: over 48 hours in the manufacturer\u2019s reference conditions<\/li>\n<li>The module may include an adjustable threshold potentiometer and signal indicator; verify the supplied board<\/li>\n<\/ul>\n<p><strong>CO\u2082 limitation:<\/strong> the source listing names CO\u2082, but the MQ135 manufacturer\u2019s documented target\/test-gas list does not establish it as a calibrated CO\u2082 meter. This is not an NDIR CO\u2082 sensor. Do not use its raw output to report dependable CO\u2082 ppm or assess ventilation without a validated gas-specific calibration and measurement method.<\/p>\n<h4>\u2699\ufe0f Reading and calibration<\/h4>\n<p>The output changes with gas exposure, but also with humidity, temperature, airflow, sensor ageing, heater voltage and other vapours. A potentiometer on a common breakout normally sets a comparator threshold; it does not calibrate gas concentration. Allow the sensor to preheat, then calibrate the complete circuit in controlled conditions. Use the datasheet\u2019s circuit guidance for the sensing voltage, heater voltage and load resistor.<\/p>\n<h4>\ud83d\udd0c Typical breakout connections<\/h4>\n<p>Pin order and outputs vary by board; common versions provide VCC, GND, analog output (AO) and comparator-based digital output (DO). The heater requires a suitable stable 5 V supply and can draw substantial current; do not power it from a microcontroller GPIO. Confirm AO\/DO voltage before connecting to 3.3 V-only inputs and use appropriate level shifting or protection.<\/p>\n<h4>\ud83d\udca1 Suitable prototype uses<\/h4>\n<ul>\n<li>Educational demonstrations of broad semiconductor-sensor response<\/li>\n<li>Relative trend experiments in a supervised environment<\/li>\n<li>Microcontroller analog-input and comparator exercises<\/li>\n<\/ul>\n<p><strong>Safety and measurement notice:<\/strong> this hobby module is not a certified air-quality instrument, CO\u2082 meter, toxic-gas monitor, fire detector or life-safety alarm. It cannot reliably identify which gas caused a reading. Do not use it to make health, occupancy, ventilation or emergency decisions, or as a replacement for certified alarms and calibrated instruments. Do not expose yourself to hazardous gases while testing.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MQ135 semiconductor gas sensor module for broad air-pollution response experiments. Requires warm-up and calibration. It is not a selective CO\u2082 meter, certified air-quality monitor or safety alarm.<\/p>\n","protected":false},"featured_media":53449,"template":"","meta":[],"product_brand":[],"product_cat":[314,316],"product_tag":[],"class_list":["post-53448","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>MQ135 Air-Quality Gas Sensor Module | MicroPlanet<\/title>\n<meta name=\"description\" content=\"MQ135 broad-response air-quality sensor module for prototypes. Review gas selectivity, calibration, heater power and CO\u2082 limitations before use.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MQ135 Air-Quality Gas Sensor Module | MicroPlanet\" \/>\n<meta property=\"og:description\" content=\"MQ135 broad-response air-quality sensor module for prototypes. Review gas selectivity, calibration, heater power and CO\u2082 limitations before use.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/\" \/>\n<meta property=\"og:site_name\" content=\"MicroPlanet Maroc\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ArduinoPlanet\/\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-19T19:00:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.microplanet.ma\/wp-content\/uploads\/2017\/04\/186-2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/produit\\\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\\\/\",\"url\":\"https:\\\/\\\/www.microplanet.ma\\\/produit\\\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\\\/\",\"name\":\"MQ135 Air-Quality Gas Sensor Module | MicroPlanet\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/produit\\\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/produit\\\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.microplanet.ma\\\/wp-content\\\/uploads\\\/2017\\\/04\\\/186-2.png\",\"datePublished\":\"2017-04-13T11:28:46+00:00\",\"dateModified\":\"2026-10-19T19:00:58+00:00\",\"description\":\"MQ135 broad-response air-quality sensor module for prototypes. Review gas selectivity, calibration, heater power and CO\u2082 limitations before use.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/produit\\\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.microplanet.ma\\\/produit\\\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/produit\\\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.microplanet.ma\\\/wp-content\\\/uploads\\\/2017\\\/04\\\/186-2.png\",\"contentUrl\":\"https:\\\/\\\/www.microplanet.ma\\\/wp-content\\\/uploads\\\/2017\\\/04\\\/186-2.png\",\"width\":1000,\"height\":1000},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/produit\\\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\\\/\\\/www.microplanet.ma\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\\\/\\\/www.microplanet.ma\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"MQ135 Air-Quality Gas Sensor Module\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/#website\",\"url\":\"https:\\\/\\\/www.microplanet.ma\\\/\",\"name\":\"MicroPlanet Maroc\",\"description\":\"Arduino, Electronique DIY, Modules, Composants, Raspberry PI\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.microplanet.ma\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/#organization\",\"name\":\"MicroPlanet\",\"url\":\"https:\\\/\\\/www.microplanet.ma\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.microplanet.ma\\\/wp-content\\\/uploads\\\/2023\\\/05\\\/logo5.png\",\"contentUrl\":\"https:\\\/\\\/www.microplanet.ma\\\/wp-content\\\/uploads\\\/2023\\\/05\\\/logo5.png\",\"width\":400,\"height\":133,\"caption\":\"MicroPlanet\"},\"image\":{\"@id\":\"https:\\\/\\\/www.microplanet.ma\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/ArduinoPlanet\\\/\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"MQ135 Air-Quality Gas Sensor Module | MicroPlanet","description":"MQ135 broad-response air-quality sensor module for prototypes. Review gas selectivity, calibration, heater power and CO\u2082 limitations before use.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/","og_locale":"en_US","og_type":"article","og_title":"MQ135 Air-Quality Gas Sensor Module | MicroPlanet","og_description":"MQ135 broad-response air-quality sensor module for prototypes. Review gas selectivity, calibration, heater power and CO\u2082 limitations before use.","og_url":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/","og_site_name":"MicroPlanet Maroc","article_publisher":"https:\/\/www.facebook.com\/ArduinoPlanet\/","article_modified_time":"2026-10-19T19:00:58+00:00","og_image":[{"width":1000,"height":1000,"url":"https:\/\/www.microplanet.ma\/wp-content\/uploads\/2017\/04\/186-2.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/","url":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/","name":"MQ135 Air-Quality Gas Sensor Module | MicroPlanet","isPartOf":{"@id":"https:\/\/www.microplanet.ma\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/#primaryimage"},"image":{"@id":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/#primaryimage"},"thumbnailUrl":"https:\/\/www.microplanet.ma\/wp-content\/uploads\/2017\/04\/186-2.png","datePublished":"2017-04-13T11:28:46+00:00","dateModified":"2026-10-19T19:00:58+00:00","description":"MQ135 broad-response air-quality sensor module for prototypes. Review gas selectivity, calibration, heater power and CO\u2082 limitations before use.","breadcrumb":{"@id":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/#primaryimage","url":"https:\/\/www.microplanet.ma\/wp-content\/uploads\/2017\/04\/186-2.png","contentUrl":"https:\/\/www.microplanet.ma\/wp-content\/uploads\/2017\/04\/186-2.png","width":1000,"height":1000},{"@type":"BreadcrumbList","@id":"https:\/\/www.microplanet.ma\/produit\/module-capteur-de-gaz-polluants-ammoniac-co2-mq135\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Accueil","item":"https:\/\/www.microplanet.ma\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/www.microplanet.ma\/shop\/"},{"@type":"ListItem","position":3,"name":"MQ135 Air-Quality Gas Sensor Module"}]},{"@type":"WebSite","@id":"https:\/\/www.microplanet.ma\/#website","url":"https:\/\/www.microplanet.ma\/","name":"MicroPlanet Maroc","description":"Arduino, Electronique DIY, Modules, Composants, Raspberry PI","publisher":{"@id":"https:\/\/www.microplanet.ma\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.microplanet.ma\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.microplanet.ma\/#organization","name":"MicroPlanet","url":"https:\/\/www.microplanet.ma\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.microplanet.ma\/#\/schema\/logo\/image\/","url":"https:\/\/www.microplanet.ma\/wp-content\/uploads\/2023\/05\/logo5.png","contentUrl":"https:\/\/www.microplanet.ma\/wp-content\/uploads\/2023\/05\/logo5.png","width":400,"height":133,"caption":"MicroPlanet"},"image":{"@id":"https:\/\/www.microplanet.ma\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/ArduinoPlanet\/"]}]}},"_links":{"self":[{"href":"https:\/\/www.microplanet.ma\/en\/wp-json\/wp\/v2\/product\/53448","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.microplanet.ma\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.microplanet.ma\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.microplanet.ma\/en\/wp-json\/wp\/v2\/media\/53449"}],"wp:attachment":[{"href":"https:\/\/www.microplanet.ma\/en\/wp-json\/wp\/v2\/media?parent=53448"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.microplanet.ma\/en\/wp-json\/wp\/v2\/product_brand?post=53448"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.microplanet.ma\/en\/wp-json\/wp\/v2\/product_cat?post=53448"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.microplanet.ma\/en\/wp-json\/wp\/v2\/product_tag?post=53448"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}