A simple thermometer with a LM317 as power regulator, which gets it's power
from an USB-adapter.
The Thermometer is a Dallas 18B20 attached to an ESP01.
It displays a nice webpage.
And build into a 3d printed case.
Full build instructions and source code on my web-page. Just 25 lines of code !!!!
Future stories will send thermometer data to cloud services like thingspeak, Dweet, Freeboard and IoTtweet
Have fun.