Raspberry Pi as low-cost HD surveillance camera

This article describes how to build a surveillance cam based on a Raspberry Pi micro-computer which records HD video when something moves in the monitored area. Live picture can be viewed from any web browser, even from your mobile while you're on the road.

What you will get:
See live stream in any web browser from anywhere
Record any motion into video file

Usually, such a cam will cost you around US$2.000, but with the result from this article, you will get such a cam for only about US$100.

Raspberry Pi Garage Door Automation

It’s a very simple board complete with a small relay, a diode, and 2 resistors. The 8 pin header provides connection to two hall effect sensors that detect the status of the garage door, and the original door opener. He then connects this to an open-source wireless Arduino clone of his own design, dubbed the Moteino. A pair of these communicate to the Raspberry Pi which acts as his secure home automation gateway server.