Need help small LED project

Hi write here in hope of some help to make a small LED project,

What I want: A LED that blinks for 24 hours once a week. Battery driven. Cheap. 

Only need 1 LED.

must be able to choose day in some way or programe an IC.

Even better would be if I could make the thing weather proof.

Noob in this area so any kind of help is welcome.


Have a look at micro controllers. Something like the Arduino platform will work for you.