Here are all the parts working together. The ISP and USART is connected to the STK600 card, but the new PCB has its own voltage connector, so it can run independently, only I forgot to include the GND pin. Not a problem thought, as there is a spare ground pin.
I'll probably crack on with making a power and interface PCB soon...
I'm happy that both sensors worked fine over the I2C bus, and that the external interrupts worked well. The only issue I had was a stupid naming error declaring the external interrupts as inputs, as the atmega1280 and atmega8 differ slightly.
So next I'll clean up the code slightly, implementing a temperature string among other, and then concentrate on coding a data app in windows.
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