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Full machine-readable index: https://core-electronics.com.au/llms.txt # Adafruit SGP40 Air Quality Sensor Breakout - VOC Index - STEMMA QT / Qwiic **Type:** Product page · **SKU:** ADA4829 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/adafruit-sgp40-air-quality-sensor-breakout-voc-index-stemma-qt-qwiic.html ([markdown](https://core-electronics.com.au/adafruit-sgp40-air-quality-sensor-breakout-voc-index-stemma-qt-qwiic.html.md)) \*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 SGP40 Multi-Pixel Gas Sensor, a fully integrated MOX gas sensor. This 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. ## Pricing - **Price:** $25.70 (inc GST) — $23.36 AUD, exc GST - **Quantity discounts:** 10+ $22.66 (exc GST) · 50+ $22.20 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 1 today, and up to 500 more in 7–12 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA4829:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA4829:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description \*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 SGP40 Multi-Pixel Gas Sensor, a fully integrated MOX gas sensor. This 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. The 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. [Adafruit currently have an Arduino library with examples of reading the raw value and also running the Sensirion algorithm to calculate VOC index](https://github.com/adafruit/Adafruit_SGP40) but do not have Python support (the Sensirion library is in C and requires a port) This 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. **The SGP40 is the next generation after the SGP30, but does not give TVOC/eCO2 values out like the SGP30.** Instead, [raw signal from the sensor is processed using their software algorithm to give an overall 'air quality' value form 0 to 500](https://github.com/Sensirion/embedded-sgp/tree/master/sgp40_voc_index). **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 comparison. Another nice element to this sensor is the ability to set humidity compensation for better accuracy. [An external humidity sensor is required and then the RH% is written over I2C to the sensor](https://github.com/adafruit/Adafruit_SGP40/blob/master/examples/sgp40_voc/sgp40_voc.ino), so it can better calibrate the MOX sensor reading and reduce humidity/temperature-based variations.. Nice sensor right? so they 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[ **STEMMA QT** form factor](https://core-electronics.com.au/search/?q=stemma%20qt%20sensor), 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://core-electronics.com.au/catalogsearch/result/?q=qwiic) I2C connectors. 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**](https://core-electronics.com.au/search/?q=stemma%20qt%20cable). Adafruit 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. ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/4/8/4829-00.jpg)