I updated the schematic and components list to include the additional components needed for the 3.3 volt supply that will power the AVR microcontroller. I updated the footprints on the PCB based on the latest schematic and laid out the board. Images of the updated schematic and preliminary PCB layout have been added to the gallery.

I still have some work to do on the PCB as I'm not completely happy with it. Since I added the image of the PCB layout to the gallery I moved IC2, C2, and C3 so they are located between D1, P3, P4, and SW1. I'm thinking about moving C1 so it is below IC1 instead of above it. Moving these parts around will keep the power and ground traces shorter and cleaner. I also changed the footprint of the LED (as it will be mounted at right angle to the PCB) and created a 3D model to match.

The last items on the to-do list for the PCB are to create a footprint and 3D model of the pushbutton switch, and change the footprint of C2 for one appropriate for an electrolytic or tantalum. Once I've completed these last few items I will do a final review of the board before getting the board made.