Lighting Senser | Electronic Project Circuits

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DERBY FINISH LINE DETECTOR by LM339

The following is an electronic schematic and parts list for the items needed to construct an infrared detector for the finish line of a Pinewood Derby racetrack utilizing an external power supply and the parallel port of an IBM compatible computer of at least 486/33Mhz running DOS 3.1 or better. Also included is a narration concerning the construction of the detector as well as the BASIC code required to operate the detector.

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Backup Lamp light fails by Vmos

There are a few situations when a power failure is particularly difficult to handle. Some of
these circumstances occur in the bathroom. This little circuit will pay for itself many times
over the first time it is used, especially if you are in the shower.

Read more original source: http://www.techlib.com/files/backup.pdf

Be the first to comment - What do you think? Posted by admin - June 25, 2008 at 10:33 am

Categories: Electronic Control, Lighting, Switching power supply Tags: light control, light switch, lighting senser

Dark-Detecting LED

Here’s a simple problem: “How do you make an LED turn on when it gets dark?” You might call it the “nightlight problem,” but the same sort of question comes up in a lot of familiar situations– emergency lights, street lights, silly computer keyboard backlights, and the list goes on.

Source: http://www.evilmadscientist.com/article.php/nightlight
Thank you.