The free and GEMA-free music used in this video comes from musicfox.com
none, i.e. documentation, hardware and software design may be freely modified, further developed and re-published. All that is required is a reference to what the re-released new version is based on, namely:
and the information of the new creator:
I have created the construction manual and all associated documents, drawings, program code etc. extremely carefully and checked for errors. Nevertheless, I cannot exclude errors and therefore, as far as legally permissible, exclude any warranty and liability.
Online article (German) on heise.de (Make:)
"Mehr Komfort: der Arduino-Überkopfwecker"