westfw

Sigh. Here's approximately what I did:
1) Add "pins" for the various nets that went nowhere (input, output, power?) 2) renumber the Rs and Cs to (roughly) identify which part of the circuit they go with, so it's easier to see on the PCB.
3) create the PCB, put the pots on there to indicate a rough size, move the components onto the board in groups similar to those derive in (2), in ways that sort-of minimized the length of the ratsnest lines.
4) Draw a gnd (PE in your case) net around the outside, and orient all the components that connect to GND on one side so that that side would be near the outside of the board.  Connect those grounds, sort of radially.  See if there's some obvious manual routing.
5) good time to SAVE.
6) run the autorouter in single-layer mode.  See which signals seem especially convoluted, and see if it looks like it would get better if those were moved somewhere else on the board, or re-oriented.  Undo the routing and actually do the moves (hey, you can UNDO autorouting in 6.0!  Cool!)
7) Repeat (6) until things look pretty good.
8) Make minor movements that look like they'll make things "prettier."
9) Add gnd polygon.
that's probably about as much as I'll do without knowing how real the component sizes are (whether the Pots are actually mounted on the pcb, etc), or what the other limitations are, or etc.  I suspect that the circuit could fit on a (cheap) 50mm*50mm PCB without too much trouble.
(can I not add zip attachments to my own orangeBoard?  Hmmph!)
https://docs.google.com/open?id=0B6dMB5dovDUZNjk2Y2E4NzUtNjdlMy00MjMxLWIxZmItY2JhNmU3YTM4NGU3

I have a library part that I call a "wire" that becomes a single pad (with various different hole sizes) on the PCB. But you could also use the "PINHD-1X1" part form the standard EAGLE "pinhead" library.

To get rid of the labels, go to the "layers" button (just below the "i" info button), and deselect the silkscreen layers (tPlace, tNames, tDocu)

It'll take at least a bit. I'm not running 6.0 yet.

> Can I please ask you a question about the Arduino? Yes. ??

Yes, you can move the CPU from an full-sized arduino into a smaller board. (subject of an upcoming instructable, probably.) You generally need a few extra components (like the crystal.) Your best bet as a beginner would be to buy one of the reduced-sized arduino-compatibles, like the Modern Device Company "Really Bare Bones Board"

The arduino environment designates some of the pins as "analog" for connecting to sensors, and some as "digital" like turning on a motor. You probably need some sort of motor driver (chip, transistor, or relay) as well. There should be lots of info on the arduino site:
Light Sensors
Motor Control (most of these examples are probably more complex than you need.)