Hi raschemmel, sorry. Im new in this.
Yes I have got an Arduino UNO and upload the sketches by USB. But a few days ago I have burned the sketch on the ATmega328 and put it standalone on a protoboard to test it 24/7.
Today I will try the 12v/4Ah battery with the 7805 and something with it to dissipate the heat.
When I could buy the AA batteries I will try this option too.
I really appreciate your time and your help.
I only ask here when I cant get information from the web or to get some experience of the people that has more knowledge like you.
Best regards, GInza