Loft Guard
Approx construction cost US$30
Once the hatch is closed, there is no external sign that the light is on. It could then remain like that until the next visit possibly several weeks or even months later. In the meantime, a significant amount of electricity would have been wasted and, more importantly, the life of the bulb has been significantly reduced.
This Loft Guard is built as a small, battery-powered unit, which is left in some suitable position inside the loft. It protects against leaving the light switched on by sounding a loud warning after 8 minutes or some other preset time. This can be heard through the ceiling even with the loft hatch closed and alerts the next person passing by underneath it.
More details on this construction project can be found in the December 1999 issue of EPE Online, the world's first web-delivered electronics and computing hobbyist magazine.
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