MICS6814 3-in-1 Gas Sensor Breakout (CO, NO2, NH3)

by Pimoroni

Measure changes in the concentration of gases including carbon monoxide (CO), nitrogen dioxide (NO2), and ammonia (NH3) with this Breakout Garden compatible I2C breakout.

The MICS6814 sensor comprises three semiconductor gas sensors in a single package, and can detect three different groups of gases that are referred to in the datasheet as reducing, oxidising, and NH3. The major gases/vapours that the sensor detects are: carbon monoxide (reducing), nitrogen dioxide (oxidising), and ammonia (NH3), but it is also sensitive to others, including hydrogen, ethanol, and hydrocarbons.

It can be used to make qualitative measurements of changes in gas concentrations, so you can tell broadly if the three groups of gases are increasing or decreasing in abundance. Without laboratory conditions or calibration, you won't be able to say "the concentration of carbon monoxide is n parts per million", for example. There's more info about the MICS6814 sensor and how it works in our Getting Started with Enviro+ tutorial.

This breakout uses a Nuvoton microcontroller which handles the I2C and analog-digital conversion, as well as controlling the sensor's inbuilt heater and the user controllable RGB LED. The LED could be used to indicate when the sensor is running or to notify you visually of gas concentration changes. It's Breakout Garden compatible, which means you can use it with any of our Breakout Garden HATs and pHATs - no soldering required!

It's useful for incorporating into indoor and outdoor air quality monitoring systems, especially if you're interested in monitoring agricultural and vehicle pollution levels.

Features

Kit includes

  • MICS6814 Gas Sensor Breakout
  • 1x5 straight male header
  • 1x5 right angle female header

We've designed this breakout board so that you can solder on the piece of right angle female header and pop it straight onto the bottom left 5 pins on your Raspberry Pi's GPIO header (pins 1, 3, 5, 7, 9).

Software

We've put together a Python library together with examples showing you how to get readings from the sensor and control the LED. 

You can also use this breakout with Raspberry Pi Pico and other RP2040 boards, using C++ or Pirate brand MicroPython.

Notes

  • Dimensions: approx 23 x 20 x 4mm (L x W x H)

8 customer reviews

3 years ago
Bought the Pi 3a+ it to run OctoPrint. I was concerned that 512MB of RAM wouldn’t hack it but it’s works perfectly. Delivery was quick within 48hrs.
by Conor about Raspberry Pi 3 A+ via REVIEWS.io
3 years ago
The Pi 3A+ specification was a good match for my application of installing MotionEyeOS to be used for a security camera and occasionally as a wildlife camera. I have made these with the Pi Zero and the Pi 3 A+ provides a better performance in a suitably compact size. My camera project fitted into a standard 68WX100LX50H sealed, clear lid box. This allowed the camera to be mounted inside to look through the lid to protect it and the Pi from the elements. I also prefer the camera connection this model compared to the zero that is more delicate or prone to connection issues. I was particularly grateful to be able to buy this board at times of short supply at the standard price prior to the shortage. Thanks Pimoroni!
by ERIC about Raspberry Pi 3 A+ via REVIEWS.io
3 years ago
I can't believe how small and powerful these things have gotten! Pint size power! I have been faithfully using Raspberry PI's since the model B, so its been about 10 years now! I have to say that I recon this is one of the best inventions of the century! It can only get smaller and more powerful from here on out! Pimoroni is the best place to get PI'S in general, and the only place to get them at the moment! I used this one to build a MT32 PI to go with another amazing invention, The MiSTer FPGA... Thanks Pimoroni!
by James about Raspberry Pi 3 A+ via REVIEWS.io
3 years ago
Paired with Emu68 this is something my beloved Amiga500 loves very much! :)
by Teemu about Raspberry Pi 3 A+ via REVIEWS.io
4 years ago
While many people will try to always go for the newest or fastest boards - and even overclocking, there are many other times, particularly in audio applications where circuit noise and RF are what you need to avoid. The Pi has long been criticised for the way it shares its Ethernet port with the onboard USB port and the extra USB ports on most Pi's are noisy as implemented as a hub, not individual channels. This is where the Model 3A scores massively. By ditching the noisy Pi's Ethernet implementation along with the unnecessary extra USB ports, you get a board that is very, very quiet from the RF standpoint - ideal for hifi audio HAT's. Add in the lower current draw and you have the ideal Pi for high definition audio. Fabricate a simple HAT-sized screening plate mounted from 2mm copper like I did and you place a virtual Faraday cage screen for your HAT, killing any Pi circuit noise stone dead. Perfect! Forget the 3B and faster but noisy 4, get this and take a giant step on your journey towards audio utopia!
by Neil about Raspberry Pi 3 A+ via REVIEWS.io
4 years ago
Worked spot on for the game emulator I made for my son to show him what games were like when I was younger a lot younger
by john about Raspberry Pi 3 A+ via REVIEWS.io
4 years ago
Excellent, Bought f0r the purpose of powering an MT32pi with the MiSTer hat, rather than use a larger "full fat" raspberry pi. Runs cool and flawlessly, providing an excellent recreation of the Roland MT32 with my MiSTer. Delivery was very fast as usual from Pimoroni.
by Anonymous about Raspberry Pi 3 A+ via REVIEWS.io

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