{"id":874,"date":"2025-05-19T22:32:33","date_gmt":"2025-05-19T22:32:33","guid":{"rendered":"https:\/\/science.gsfc.nasa.gov\/stella\/?page_id=874"},"modified":"2025-06-07T18:50:54","modified_gmt":"2025-06-07T18:50:54","slug":"stella-aq-technical-details","status":"publish","type":"page","link":"https:\/\/science.gsfc.nasa.gov\/stella\/instruments\/atmospheric-monitoring\/stella-aq\/stella-aq-technical-details\/","title":{"rendered":"STELLA-AQ Technical Details"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"874\" class=\"elementor elementor-874\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b041302 e-flex e-con-boxed e-con e-parent\" data-id=\"b041302\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-92194a5 elementor-widget elementor-widget-heading\" data-id=\"92194a5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">STELLA-AQ Technical Details\u200b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c4c9e10 e-flex e-con-boxed e-con e-parent\" data-id=\"c4c9e10\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b0750c7 elementor-widget elementor-widget-text-editor\" data-id=\"b0750c7\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"mb-2 whitespace-pre-wrap\">The STELLA-AQ (Air Quality) instrument delivers comprehensive atmospheric monitoring capabilities through an integrated sensor array and robust data collection system. Built around a Feather STM32F405 or Thing Plus RP2040 microcontroller, this scientific instrument combines precision sensing with user-friendly operation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-738fba8 e-flex e-con-boxed e-con e-parent\" data-id=\"738fba8\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-34e5f50 e-con-full e-flex e-con e-child\" data-id=\"34e5f50\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f651aef elementor-widget elementor-widget-text-editor\" data-id=\"f651aef\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Core Components<\/h2><ul><li><strong>Microcontroller<\/strong>: Feather STM32F405 or Thing Plus RP2040<\/li><li><strong>Real-Time Clock<\/strong>: PCF8523 with battery backup for accurate timestamping<\/li><li><strong>Display<\/strong>: 128&#215;128 OLED for data visualization<\/li><li><strong>Data Storage<\/strong>: Micro-SD card for CSV data logging<\/li><li><strong>Power<\/strong>: 3.7V rechargeable lithium-ion battery with integrated charging circuit<\/li><\/ul><h2>Sensor Suite<\/h2><ul><li><strong>Particulate Matter<\/strong>: PMSA003I sensor monitoring 2.5ppm to 10ppm concentrations<\/li><li><strong>Carbon Dioxide<\/strong>: SCD-40 photoacoustic CO\u2082 sensor<\/li><li><strong>Methane<\/strong>: Dedicated methane detection capability<\/li><li><strong>Environmental Parameters<\/strong>: BME280 sensor measuring:<ul><li>Barometric pressure<\/li><li>Relative humidity<\/li><li>Air temperature<\/li><li>Altitude<\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-383f04f e-con-full e-flex e-con e-child\" data-id=\"383f04f\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5eebb2c elementor-widget elementor-widget-image\" data-id=\"5eebb2c\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"841\" height=\"1024\" src=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2025\/06\/STELLA-AQ_assembly_front-841x1024.jpg\" class=\"attachment-large size-large wp-image-1830\" alt=\"STELLA-AQ front assembly\" srcset=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2025\/06\/STELLA-AQ_assembly_front-841x1024.jpg 841w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2025\/06\/STELLA-AQ_assembly_front-246x300.jpg 246w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2025\/06\/STELLA-AQ_assembly_front-768x935.jpg 768w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2025\/06\/STELLA-AQ_assembly_front-1262x1536.jpg 1262w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2025\/06\/STELLA-AQ_assembly_front-1683x2048.jpg 1683w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2025\/06\/STELLA-AQ_assembly_front.jpg 1939w\" sizes=\"(max-width: 841px) 100vw, 841px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-edd7ed3 e-flex e-con-boxed e-con e-parent\" data-id=\"edd7ed3\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bd61c30 elementor-widget elementor-widget-text-editor\" data-id=\"bd61c30\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>System Features<\/h2><ul><li><strong>Calculated Metrics<\/strong>: Automatic calculation of dew point and particulate ratios<\/li><li><strong>Connection System<\/strong>: Qwiic\/STEMMA-QT connectors for solderless assembly<\/li><li><strong>Software Platform<\/strong>: CircuitPython programming environment<\/li><li><strong>Interface<\/strong>: Power switch and intuitive control system<\/li><li><strong>Housing Options<\/strong>: Can be secured to a ruler or mounted in a jewelry box enclosure<\/li><li><strong>Construction Cost<\/strong>: Approximately $200 using commercial off-the-shelf components<\/li><li><strong>Assembly Complexity<\/strong>: No soldering required, connector-based construction<\/li><\/ul><p>The STELLA-AQ represents an accessible yet powerful platform for air quality assessment, combining professional-grade sensing capabilities with educational accessibility for scientific monitoring and analysis.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>STELLA-AQ Technical Details\u200b The STELLA-AQ (Air Quality) instrument delivers comprehensive atmospheric monitoring capabilities through an integrated sensor array and robust data collection system. Built around&hellip;<\/p>\n","protected":false},"author":2,"featured_media":642,"parent":734,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"class_list":["post-874","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>STELLA-AQ Technical Details - STELLA<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/science.gsfc.nasa.gov\/stella\/instruments\/atmospheric-monitoring\/stella-aq\/stella-aq-technical-details\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"STELLA-AQ Technical Details - STELLA\" \/>\n<meta property=\"og:description\" content=\"STELLA-AQ Technical Details\u200b The STELLA-AQ (Air Quality) instrument delivers comprehensive atmospheric monitoring capabilities through an integrated sensor array and robust data collection system. 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