Wearable technology does a fine job of keeping tabs on your personal fitness. But to measure the health of the place where you live, you need a different tool. This device monitors the temperature, humidity, noise, and light level for any room. It can even track the number of people who enter. Within the casing, a collection of sensors sends information to an Arduino, which interprets the input and displays the data on a small screen. Based on the device’s readings, you can turn on a dehumidifier, lower the thermostat, or crack open a window - whatever it takes to keep your home environment comfortable.
Read more: http://www.popsci.com/how-build-home-sensor