Alright, what I'm trying to do is combine the following:
1. arduino board with atmega168a chip stripped down to the bare minimum running on internal clock.
2. lm2731 boost converter. battery input 6-12V with 12VDC output. http://www.ti.com/lit/ds/symlink/lm2731.pdf
3. chip on glass serial lcd display http://www.newhavendisplay.net/index.php?main_page=product_info&cPath=3_111&products_id=1829
In addition I'll need to add a few transistors, switches, etc. and lines out. I'm controlling 12V solenoid valves (yes, read the tutorial). The thing is, I need to combine all into a 1"x2" one sided board. SMD is what I'm going for but preferably not so tiny as to be impossible to solder by hand. The LCD screen will be mounted on the back side of the board. The whole board would be at 3V per the lcd screen.
I've gotten as far as pulling up an eagle schematic for the lm2731 and my transistors etc, but I'm not sure how to proceed with integrating that with the arduino components. I'm afraid I'll throw out connections/parts that I need if I just start hacking it up and trying to combine them.
I'm hoping to program this with arduino ide and use the serial package to communicate with the lcd.
Any advice or help with how to proceed would be VERY much appreciated...I'm stuck.