{"product_id":"adafruit-sgp41-multi-pixel-gas-sensor-breakout-voc-nox-stemma-qt-qwiic","title":"Adafruit SGP41 Multi-Pixel Gas Sensor Breakout - VOC \u0026 NOx - STEMMA QT \/ Qwiic","description":"\u003cp\u003e*sniff* *sniff* ... do you smell that? No need to stick your nose into a carton of milk anymore, you can build a digital nose with the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAdafruit SGP41 Multi-Pixel Gas Sensor\u003c\/strong\u003e, a fully integrated MOX gas sensor.\u003c\/p\u003e\n\u003cp\u003eThis is a very fine air quality sensor from the sensor experts at Sensirion, with I2C interfacing so you don't have to manage the heater and analog reading of a MOX sensor. It combines multiple metal-oxide sensing and heating elements on one chip to provide more detailed air quality signals — and unlike the SGP40, the SGP41 adds a dedicated NOx sensing pixel so you can measure both VOCs\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eand\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003enitrogen oxides!\u003c\/p\u003e\n\u003cp\u003eThe SGP41 has two MOX hot-plate sensor elements (one for VOC, one for NOx), as well as a small microcontroller that controls power to the plates, reads the analog voltages, and provides an I2C interface to read from. Unlike the CCS811, this sensor does not require I2C clock stretching.\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_SGP41\"\u003eAdafruit currently have an Arduino library for reading the raw VOC and NOx signals\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_CircuitPython_SGP41\"\u003ea Python\/CircuitPython library\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003ethat can be used with Linux computers like the Raspberry Pi or our CircuitPython boards.\u003c\/p\u003e\n\u003cp\u003eThis is a gas sensor that can detect a wide range of Volatile Organic Compounds (VOCs) as well as oxidizing gases such as NOx, and is intended for indoor air quality monitoring.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eThe SGP41 is the next generation after the SGP40, adding a second NOx sensing pixel. It does not give TVOC\/eCO2 values out like the SGP30.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eInstead,\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/github.com\/Sensirion\/gas-index-algorithm\"\u003ethe two raw signals from the sensor are processed using Sensirion's Gas Index Algorithm to give VOC and NOx Index values on a scale from 1 to 500\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— where 100 indicates a typical indoor environment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note, this sensor, like all VOC\/gas sensors, has variability, and to get precise measurements you will want to calibrate it against known sources!\u003c\/strong\u003e That said, for general environmental sensors, it will give you a good idea of trends and comparison.\u003c\/p\u003e\n\u003cp\u003eAnother nice element to this sensor is the ability to set humidity and temperature compensation for better accuracy. An external humidity\/temperature sensor is required and then the RH% and temperature are written over I2C to the sensor, so it can better calibrate the MOX sensor readings and reduce humidity\/temperature-based variations.\u003c\/p\u003e\n\u003cp\u003eNice sensor right? So we made it easy for you to get right into your next project. The surface-mount sensor is soldered onto a custom made PCB in the\u003ca title=\"STEMMA QT form factor\" href=\"\/collections\/qw-st\" target=\"_blank\" rel=\"noopener\"\u003e \u003cstrong\u003eSTEMMA QT\u003c\/strong\u003e form factor\u003c\/a\u003e, making them easy to interface with. The \u003ca href=\"https:\/\/learn.adafruit.com\/introducing-adafruit-stemma-qt\/what-is-stemma-qt\"\u003eSTEMMA QT connectors\u003c\/a\u003e on either side are compatible with the \u003ca href=\"https:\/\/www.sparkfun.com\/qwiic\"\u003eSparkFun Qwiic\u003c\/a\u003e I2C connectors. This allows you to make solderless connections between your development board and the SGP41 or to chain it with a wide range of other sensors and accessories using a \u003ca href=\"\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\" rel=\"noopener\"\u003e\u003cstrong\u003ecompatible cable\u003c\/strong\u003e\u003c\/a\u003e. \u003ca href=\"\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\" rel=\"noopener\"\u003eQT Cable is not included, but we have a variety in the shop\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eWe've of course broken out all the pins to standard headers and added a 3.3V voltage regulator and level shifting so allow you to use it with either 3.3V or 5V systems such as the Arduino Uno, or Feather M4.\u003c\/p\u003e\n\u003ch2\u003eTechnical Details\u003c\/h2\u003e\n\u003cimg src=\"https:\/\/www.adafruit.com\/includes\/templates\/shop2019\/images\/RoHS2_2011_65_EU.svg\" alt=\"RoHS 2 2011 65 EU Compliant\" width=\"145\" height=\"80\"\u003e\u003cimg src=\"https:\/\/www.adafruit.com\/includes\/templates\/shop2019\/images\/RoHS2_2015_863_EU.svg\" alt=\"RoHS 2 2015 863 EU Compliant\" width=\"145\" height=\"80\"\u003e\n\u003ch2\u003eLearn\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/learn.adafruit.com\/adafruit-sgp41-multi-pixel-gas-sensor-breakout\"\u003ePrimary Guide: Adafruit SGP41 Multi-Pixel Gas Sensor Breakout\u003c\/a\u003e\nVOC \u0026amp; NOx over STEMMA\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/products\/6455\/guides\" target=\"_blank\" rel=\"noopener\"\u003eSee All Guides\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":56103071842683,"sku":"ADA6455","price":15.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/6455-05.png?v=1771954600","url":"https:\/\/shop.pimoroni.com\/products\/adafruit-sgp41-multi-pixel-gas-sensor-breakout-voc-nox-stemma-qt-qwiic","provider":"Pimoroni Ltd","version":"1.0","type":"link"}