# Adafruit CCS811 Air Quality Sensor ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/098/294/medium800/adafruit_products_CCS811_top.jpg?1609367809) Breathe easy - we finally have an I2C VOC/eCO2 sensor in the Adafruit shop! Add air quality monitoring to your project and with an **Adafruit CCS811 Air Quality Sensor Breakout**. This sensor from AMS is a gas sensor that can detect a wide range of Volatile Organic Compounds (VOCs) and is intended for indoor air quality monitoring. When connected to your microcontroller (running our library code) it will return a Total Volatile Organic Compound (TVOC) reading and an equivalent carbon dioxide reading (eCO2) over I2C. Warning: Warning: ![](https://cdn-learn.adafruit.com/assets/assets/000/044/631/medium800/sensors_3566_quarter_ORIG.jpg?1501599369) The CCS811 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. This part will measure **eCO2** (equivalent calculated carbon-dioxide) concentration within a range of 400 to 8192 parts per million (ppm), and **TVOC** (Total Volatile Organic Compound) concentration within a range of 0 to 1187 parts per billion (ppb). According to the fact sheet it can detect Alcohols, Aldehydes, Ketones, Organic Acids, Amines, Aliphatic and Aromatic Hydrocarbons. Please note, this sensor, like all VOC/gas sensors, has variability and to get precise measurements you will want to calibrate it against known sources! That said, for general environmental sensors, it will give you a good idea of trends and comparisons. Info: The CCS811 has a configurable interrupt pin that can fire when a conversion is ready and/or when a reading crosses a user-settable threshold. The CCS811 supports multiple drive modes to take a measurement every 1 second, every 10 seconds, every 60 seconds, or every 250 milliseconds. For your convenience we've pick-and-placed the sensor on a PCB with a 3.3V regulator and some level shifting so it can be easily used with your favorite 3.3V or 5V microcontroller. We've also prepared software libraries to get you up and running in Arduino or CircuitPython with just a few lines of code! The breakout is made in the[  **STEMMA QT**  form factor](https://www.adafruit.com/?q=stemma%20qt%20sensor "STEMMA QT form factor"), making them easy to interface with. The [STEMMA QT connectors](https://learn.adafruit.com/introducing-adafruit-stemma-qt/what-is-stemma-qt) on either side are compatible with the [SparkFun Qwiic](https://www.sparkfun.com/qwiic) I2C connectors. This allows you to make solderless connections between your development board and the BME280 or to chain it with a wide range of other sensors and accessories using a [**compatible cable**](https://www.adafruit.com/?q=stemma%20qt%20cable). Info: ![](https://cdn-learn.adafruit.com/assets/assets/000/044/632/medium800/sensors_3566_kit_ORIG.jpg?1501599870) - [Next Page](https://learn.adafruit.com/adafruit-ccs811-air-quality-sensor/pinouts.md) ## Featured Products ### Adafruit CCS811 Air Quality Sensor Breakout - VOC and eCO2 [Adafruit CCS811 Air Quality Sensor Breakout - VOC and eCO2](https://www.adafruit.com/product/3566) [Discontinued - **you can grab the ** Adafruit SGP30 Air Quality Sensor Breakout - VOC and eCO2 - STEMMA QT / Qwiic  **instead! **](https://www.adafruit.com/product/3709) Breathe easy - we finally have an I2C VOC/eCO2 sensor in the Adafruit shop! Add air... No Longer Stocked [Buy Now](https://www.adafruit.com/product/3566) [Related Guides to the Product](https://learn.adafruit.com/products/3566/guides) ## Related Guides - [Best Beginner Boards for Teachers](https://learn.adafruit.com/best-beginner-boards-for-teachers.md) - [Fruit Jam IRC Client in CircuitPython](https://learn.adafruit.com/fruit-jam-irc-client-in-circuitpython.md) - [Stand-alone programming AVRs using CircuitPython](https://learn.adafruit.com/stand-alone-programming-avrs-using-circuitpython.md) - [Adafruit Sensirion SHT40, SHT41 & SHT45 Temperature & Humidity Sensors](https://learn.adafruit.com/adafruit-sht40-temperature-humidity-sensor.md) - [Wirelessly Program a Circuit Playground Bluefruit Using the File Glider App ](https://learn.adafruit.com/how-to-transfer-files-to-a-circuit-playground-bluefruit-using-the-fileglider-app.md) - [Adafruit WebIDE](https://learn.adafruit.com/webide.md) - [Bluefruit Playground Hide and Seek](https://learn.adafruit.com/hide-n-seek-bluefruit-ornament.md) - [NeoPixel Rotary Fidget](https://learn.adafruit.com/neopixel-rotary-fidget.md) - [AR1100 Resistive Touch Screen Controller Guide](https://learn.adafruit.com/ar1100-resistive-touch-screen-controller-guide.md) - [Game & Watch Octopus](https://learn.adafruit.com/game-watch-octopus.md) - [Pathfinder Robot Companion](https://learn.adafruit.com/pathfinder.md) - [Adafruit QMC5883P - Triple Axis Magnetometer](https://learn.adafruit.com/adafruit-qmc5883p-triple-axis-magnetometer.md) - [LED Masquerade Masks with n00ds](https://learn.adafruit.com/led-masquerade-masks-with-n00ds.md) - [Remote controlled door lock using a fingerprint sensor & Adafruit IO](https://learn.adafruit.com/remote-controlled-door-lock-using-a-fingerprint-sensor-and-adafruit-io.md) - [2.7" Monochrome 128x64 OLED Display Module](https://learn.adafruit.com/2-7-monochrome-128x64-oled-display-module.md)