{"product_id":"adafruit-sgp40-air-quality-sensor-breakout-voc-index-stemma-qt-qwiic","title":"Adafruit SGP40 Air Quality Sensor Breakout - VOC Index","description":"\u003cp\u003eSniff, 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 SGP40 Multi-Pixel Gas Sensor, 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.\u003c\/p\u003e\n\u003cp\u003eThe SGP40 has a 'standard' hot-plate MOX sensor, as well as a small microcontroller that controls power to the plate, reads the analog voltage and provides an I2C interface to read from. Unlike the CCS811, this sensor does not require I2C clock stretching. \u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_SGP40\" target=\"_blank\"\u003eAdafruit currently have an Arduino library with examples of reading the raw value and also running the Sensirion algorithm to calculate VOC index\u003c\/a\u003e but do not have Python support (the Sensirion library is in C and requires a port)\u003c\/p\u003e\n\u003cp\u003eThis is a gas sensor that can detect a wide range of Volatile Organic Compounds (VOCs) and H2 and is intended for indoor air quality monitoring. \u003cstrong\u003eThe SGP40 is the next generation after the SGP30, but does not give TVOC\/eCO2 values out like the SGP30.\u003c\/strong\u003e Instead, \u003ca href=\"https:\/\/github.com\/Sensirion\/embedded-sgp\/tree\/master\/sgp40_voc_index\" target=\"_blank\"\u003eraw signal from the sensor is processed using their software algorithm to give an overall 'air quality' value form 0 to 500.\u003c\/a\u003e\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 compensation for better accuracy. \u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_SGP40\/blob\/master\/examples\/sgp40_voc\/sgp40_voc.ino\" target=\"_blank\"\u003eAn external humidity sensor is required and then the RH% is written over I2C to the sensor\u003c\/a\u003e, so it can better calibrate the MOX sensor reading and reduce humidity\/temperature-based variations..\u003c\/p\u003e\n\u003cp\u003eNice sensor right? So Adafruit 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 href=\"\/en-eu\/collections\/stemma-qt\" target=\"_blank\"\u003eSTEMMA QT 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\" target=\"_blank\"\u003eSTEMMA QT connectors\u003c\/a\u003e on either side are compatible with the \u003ca href=\"\/en-eu\/collections\/qwiic\" target=\"_blank\"\u003eSparkFun Qwiic I2C connectors\u003c\/a\u003e. This allows you to make solderless connections between your development board and the SGP40 or to chain it with a wide range of other sensors and accessories using a compatible cable. QT Cable is not included, but \u003ca href=\"\/en-eu\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\"\u003ewe have a variety in the shop\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eAdafruit have 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","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":32334684225619,"sku":"ADA4829","price":14.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/4829-01.jpg?v=1607438235","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-sgp40-air-quality-sensor-breakout-voc-index-stemma-qt-qwiic","provider":"Pimoroni Ltd","version":"1.0","type":"link"}