This light sensor switch circuit allows the automatic connection of a lamp when the light is low (at nightfall) and will maintain the lamp ON for a certain period of time. This time can be adjusted ...

[Dillon] wrote in to tell us about his latest project, an automatic light switch for a the hallway closet in his house. Although this project could probably be done very simply, [Dillon] accomplished ...

An air curtain is a machine that blows a controlled stream of air across an opening to the other side to create an air seal. The air curtain, also known as an air door or fly fan, is not the same as ...