I am a young person interested in electronics and don't know much about this. My home has been constantly pelted with toilet paper and other pranks by a "friend" of mine, and I have designed a wonderful system for alerting me and scaring her off (on camera), but the missing piece is motion sensing.
Do I use a PIR sensor to tell if the prankster has arrived? An ultra-sonic rangefinder? something else? I live somewhere with lots of rain, so how do you waterproof such things? Sugru?
Thanks for any help / advice.