This is a second generation device that educates people about Volatile Organic Compounds (VOCs) and Air Quality.

A Raspberry Pi Zero W is used to read data from the VOC sensor via the I²C interface. An RGB LED changes its color based on the measured VOC levels. It can also collect data and upload it to the cloud. This device was:

• Exhibited at the World Maker Faire held in Queens, NY in September, 2017
• Featured in the December 2017 of the MagPi magazine from the Raspberry Pi foundation

Here is a video of the device in action where it changes colors when a sharpie is introduced next to the sensor.