To be able to use the DS18B20 one-wire digital temperature sensor with the Arduino, we will make use of the “DallasTemperature” library. If you haven’t already done so, you need to install it.

An Arduino measures the temperature of the room via a DS18B20 temperature sensor which then has the servo turn the control knob to the ... or wire in a more stable one, and be done ...

Well tech tinkerer Joe Desbonnet has whipped up what he dubs "poor man's NFC" using an Arduino, some magnet wire, and any compass-equipped Android smartphone (which is almost all of them).