I'll like to add some kind of photoresitor thingy to the kit to have a automatic brightness control .
Looking to the schematics it seams the only use full I/O pins to be used would be the lines used for the Chronodot (which i have installed).
Seen this is I2C I think about mapping the 2 atmel168 I/o lines (28/27) to 18/19 and use these for the chronodot i/o (seen i don't use the isp header) freeing up 28/27 to read analog stuff.
Besides the obvious changes needed on the software side, any obvious thing that i'm missing that would make this a bad idea?

The Bulbdial clock kit has three communications ports: ISP/SPI, Serial, and TWI/I2C, and there's no harm in getting rid of any of these interfaces if you don't need them.

If you want to add analog inputs, you might consider using an I2C based ADC, such as the MAX1036. There are also SPI based ADCs, like the MCP3202.

If you want to do rewiring, I'd suggest that it's probably easier to move one or two of the GPIO lines, for example C0 and/or C1 than to move the I2C lines. Since C0 and C1 go directly to the resistor locations, you could do this mod without cutting any traces on the circuit board, and then you can still use the hardware-based I2C interface. It would be straightforward to modify the program to treat the SPI port as GPIO to control lines LED2 and LED3.

thankx,

i'll mess around after my peggy2Le is "up and running"