Captain Herrmano's Mystery Box is a reverse geocache with some "special features" built by Raffael Herrmann. It's based on an Arduino Mega and a bunch of sensors.
Feel free to grab-up/fork the project and make it better!
For more information visit:
(german) => http://code-bude.net/2014/12/17/captain-herrmanos-mystery-box-ein-reverse-geocache/
(english) => http://en.code-bude.net/2014/12/17/captain-herrmanos-mystery-box-a-reverse-geocache/
Captain Herrmano's Mystery Box is project by Raffael Herrmann and was first released to public in 12/2014. It's licensed under the MIT license.