{"product_id":"benzene-toluene-acetone-formaldehyde-sensor-mq138-breakout-with-qwiic","title":"Benzene, Toluene, Acetone, Formaldehyde Sensor MQ138 Breakout with Qwiic","description":"\u003cp\u003e\u003cstrong\u003eThe MQ138 Formaldehyde Sensor Breakout detects formaldehyde and other volatile organic compounds (VOCs) over Qwiic, making it ideal for indoor air quality monitoring, smart home safety systems, and environmental sensing projects.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003eProtect your place from dangerous organic compounds with the \u003cstrong\u003eMQ138 Formaldehyde Sensor\u003c\/strong\u003e. Formaldehyde, benzene, toluene, and acetone are invisible health hazards commonly found in new furniture, building materials, paints, and cleaning products - but now you can detect them before they become a problem.\u003c\/p\u003e\n\u003cp\u003ePerfect for indoor air quality monitoring, \u003ca href=\"\/collections\/home-automation-store\" title=\"Home Automation Store\"\u003esmart home\u003c\/a\u003e safety systems, and industrial hygiene applications, this intelligent sensor features an onboard microcontroller for accurate, calibrated readings through the convenient Qwiic interface. Engineered with an integrated microcontroller, this sensor delivers pre-calibrated readings through the \u003ca href=\"\/collections\/qwiic-stemma-qt\" title=\"Qwiic and STEMMA QT\"\u003eQwiic\u003c\/a\u003e interface, eliminating analogue signal processing and calibration requirements.\u003c\/p\u003e\n\u003cp\u003ePlease note that you will have to use our \u003ca href=\"\/collections\/arduino-store\" title=\"Arduino Store\"\u003eArduino\u003c\/a\u003e library for the project to ensure correct communication with the onboard microcontroller. Don't worry, using our documentation, you should find it easy to get started.\u003c\/p\u003e\n\u003cp\u003eThe digital output provides reliable, consistent measurements while the Qwiic system enables tool-free connection to all Soldered development boards and others which support the \u003cstrong\u003eQwiic\/STEMMA-QT\u003c\/strong\u003e interface. The \u003cstrong\u003e3.3V\u003c\/strong\u003e operation with onboard regulation ensures compatibility with modern microcontroller systems, while four mounting holes enable secure installation in monitoring applications.\u003c\/p\u003e\n\u003cp\u003eThis sensor is ideal for detecting formaldehyde levels in new homes, furniture, and workplace safety monitoring. The LED indicator provides immediate visual feedback when harmful \u003cstrong\u003eVOC\u003c\/strong\u003e levels are detected. Allow an initial heat-up period (48 hours first run and then each consecutive run 5 mins heat up time) for optimal accuracy.\u003c\/p\u003e\n\u003cp\u003eThe sensor provides relative concentration readings perfect for trend monitoring and threshold detection. Ideal for triggering ventilation systems or safety alerts. Four mounting holes enable permanent \u003cstrong\u003einstallation in HVAC systems\u003c\/strong\u003e, indoor air quality monitors, or portable testing devices. Compatible with Arduino, \u003ca href=\"\/collections\/raspberry-pi\" title=\"Official Raspberry Pi Products\"\u003eRaspberry Pi\u003c\/a\u003e, and \u003cstrong\u003eESP32\u003c\/strong\u003e through the Qwiic interface.\u003c\/p\u003e\n\u003cp\u003eIncludes documentation and example code for immediate implementation in air quality monitoring projects. Custom selectable \u003cstrong\u003eI2C\u003c\/strong\u003e address via onboard switch ensures compatibility with existing projects.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/soldered-electronics\" title=\"Soldered Electronics\"\u003eView our full range of Soldered Electronics products here.\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDetects formaldehyde, benzene, toluene, and acetone\u003c\/li\u003e\n\u003cli\u003eIntegrated onboard microcontroller with pre-calibrated readings\u003c\/li\u003e\n\u003cli\u003eQwiic interface for tool-free connection\u003c\/li\u003e\n\u003cli\u003eDigital output with LED indicator for VOC level feedback\u003c\/li\u003e\n\u003cli\u003e3.3V operation with onboard regulation\u003c\/li\u003e\n\u003cli\u003eCompatible with Arduino, Raspberry Pi, and ESP32\u003c\/li\u003e\n\u003cli\u003eSelectable I2C address via onboard switch\u003c\/li\u003e\n\u003cli\u003eFour mounting holes for secure installation\u003c\/li\u003e\n\u003cli\u003eProvides relative concentration readings for trend monitoring\u003c\/li\u003e\n\u003cli\u003e5-minute heat-up time per operation (48 hours for initial use)\u003c\/li\u003e\n\u003cli\u003eIncludes documentation and example code\u003c\/li\u003e\n\u003cli\u003eIdeal for indoor air quality monitoring and smart home safety\u003c\/li\u003e\n\u003cli\u003eATTiny404 microcontroller onboard\u003c\/li\u003e\n\u003cli\u003eQwiic connectors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 54 x 22mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eResources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.soldered.com\/mq\/overview\/\" rel=\"noopener\" title=\"Full product documentation\" target=\"_blank\"\u003eFull product documentation\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cms.soldered.com\/products\/333128\/media\/333128_pinout-png_11a292.svg\" rel=\"noopener\" title=\"Pinout drawing\" target=\"_blank\"\u003ePinout drawing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.soldered.com\/mq\/hardware\/\" rel=\"noopener\" title=\"Hardware details\" target=\"_blank\"\u003eHardware details\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.soldered.com\/mq\/arduino\/initialization-qwiic\/\" rel=\"noopener\" title=\"Arduino library documentation\" target=\"_blank\"\u003eArduino library documentation\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/github.com\/SolderedElectronics\/Benzene--Toluene--Acetone--Formaldehyde-sensor-MQ138-breakout-with-easyC-hardware-design\" rel=\"noopener\" title=\"Open source hardware files\" target=\"_blank\"\u003eOpen source hardware files\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.soldered.com\/mq\/arduino\/geting-started\/\" rel=\"noopener\" title=\"Getting started with Arduino\" target=\"_blank\"\u003eGetting started with Arduino\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/github.com\/SolderedElectronics\/Soldered-MQ-Gas-Sensor-Arduino-Library\/tree\/main\" rel=\"noopener\" title=\"Arduino library\" target=\"_blank\"\u003eArduino library\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Benzene, Toluene, Acetone, Formaldehyde Sensor MQ138 Breakout with Qwiic\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Soldered Electronics","offers":[{"title":"Default Title","offer_id":56056289362305,"sku":"SOL-333128","price":30.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0176\/3274\/files\/benzene-toluene-acetone-formaldehyde-sensor-mq138-breakout-with-qwiic-soldered-electronics-sol-333128-1253317016.jpg?v=1786035220","url":"https:\/\/thepihut.com\/products\/benzene-toluene-acetone-formaldehyde-sensor-mq138-breakout-with-qwiic","provider":"The Pi Hut","version":"1.0","type":"link"}