If you have a garage, you may, at times, become haunted by the feeling that the garage door is open. Here’s a project that will exorcise that ghost. See more from Instructables:
The purpose of this project is to implement a remote-controlled indicator (located inside the house) to show the status of a shed or garage door, either by reusing the infrastructure that an existing alarm system provides (as described below), or using another suitable receiver (pointers below). No more door left open!
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