Hello,
Regarding the MotionMote sketch, I was wondering if instead of sleeping the controller for 8 seconds and waking up to check the motion flag, can you just sleep indefinitely using SLEEP_MODE_PWR_DOWN, and let the interrupt pin from the motion sensor wake you up. If you wake up at all, it means motion has been detected, so send the wireless data packet.
Is there some implication in using two interrupts (RFM69 on interrupt 0, motion sensor on interrupt 1) that prevents you from using SLEEP_MODE_PWR_DOWN?
If you sleep the microcontroller but forget to sleep the RFM69, will the RFM69's interrupt wake up your microcontroller? I don't really know what the RFM69's interrupt pin is used for.