I'm going to start by saying that I consider myself an EXTREME novice in the world of electronics and programming, but I really want to learn this awesome stuff. Anyway, I recently finished building my Mendel90 3D printer and decided I wanted to make something like http://www.thingiverse.com/thing:13099.
Ultimately I want to print a few more of these and create a clock or calendar. I went ahead and made some small tweaks to the original design by making it slightly thicker, a little taller, and removed the dot. Here is the back my 7 segment display printed with LED's in place for demonstration purposes.
In my efforts to teach myself and learn more about electronics I really wanted to design the schematic myself. I feel the best way to learn is to actually do it yourself. I also decided with this project that I wanted to learn about multiplexing and shift registers, but I didn't just want to breadboard something and then tear it all apart. I drew this thing up using an ATTINY85. To be honest I hope an ATTINY will even work in this setup. That's why I'm here, I really want to see if my schematic is completely wrong or if I'm getting close. From what I've read I'm thinking that the LED portion of the schematic needs to be changed, maybe not. :~ I say that because I'm going to be using white LED's. I don't have a datasheet for them so I'm assuming 3.3Vf and 20mA. Maybe I don't need to change anything with the LED's at all, my complete "newbieness" is becoming more apparent.
Here are the areas that I'm still questioning.