Device that you attach to the viewhole. When the door is knocked, the device, if armed, will take a picture through the viewhold and make it available on the internet through upload or email. How hard can this be with linux? Should take a shot at this sometime.
After attending Maker Faire 2009, I have renewed interest in this one. Question is - how does one recognize a knock on the door electronically? My mind came up with a sensor that detects vibration - you decide how soft of a knock you want to detect and build a sensor accordingly - it's this shallow cuboid filled with oil or some other viscous fluid, and in it, you have springloaded wires with weights - speaking microscopically of course - at their ends. Knock - weights move - and complete an electrical circuit and you detect a knock. This is probably a MEMS problem.
Other way is to look at the output of a microphone and use that. But, now you're into preamp/no preamp, etc.
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