The Problem

You ever find yourself sneezing inside your home and wondering “What the heck?! What is making me sneeze?”

I had that same question.

After wildfires have ravaged parts of the USA and smog has loomed in our skies it’s become more important than ever to make sure you’re breathing clean air. Some folks may just go by an air purifier. But, how do you know it works? How do you know if it’s powerful enough to protect your whole space?

Like a scientist, you can test it with Particle Squared.

What is it?

Particle squared is an all-in-one air quality sensor for Particle and Feather based development boards. It brings together a trio of sensors to give you as many data points as possible. That way, there won’t be anything missing when you go to measure the air inside your home or workplace.

The most important sensor is the Honeywell HPMA115S0 dust sensor. This tells you how many micrograms of material is floating around in a cubic volume of space.

Second to that, is the  AMS CCS811. This sensor tells you the total amount of volatile organic compounds are in the air along with things like C02. It’s another datapoint which is interesting to see. I’ve previously placed this sensor in our basement only to be surprised and see huge spikes in VOC and C02 levels from our (oil burning) furnace turning on in the morning. Time for better ventilation!

Finally, the  Silicon Labs Si7021 temperature and humidity sensor. These two bits of environmental data are useful. More importantly they’re used by the algorithm in the CCS811 to compute the TVOC and C02.

No outlet nearby where you want to measure? No problem!

You can easily plug in almost any lithium polymer battery to your Particle or Feather based board and use it immediately. Particle Squared has extra circuitry that allow you to use either USB or battery power. How great is that?

The Source

Plug this board in and start right away with the code available here.

What’s On Board?

  • Silicon Labs Si7021 Humidity and Temperature Sensor
  • AMS CCS811 Total VOC and C02 Sensor
  • Honeywell HPMA Dust Sensor & 2” cable (sold separately as an add-on)

The Guide

To learn more about how to use this board for your own project, check out the post here.

The Logistics

Shipping is a flat 4 dollars anywhere in the USA. Shipping can be combined for multiple.

Note:all boards shipping as of 6/12/19 are Rev 3 (slight improvements for battery operation).

👉 Looking for the source? Get the hardware files and code here.

Need something else? Email me.