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@wb9ddf: thank you for reinforcing my point with more detailed explanation. To be fair to the authors, there may be some value-added uses cases (perhaps industrial ones) in controlling lux-level threshold but its case hasn't been made adequately in the article.
About 10 or 12 years ago I built a lighting control system with similar function for an office building I own. I used a timer and photocell from the local home improvement store. The photocell was wired in series with the timer switch contacts. The result is that the lights come on at sunset, shut off at 11:00pm, come on at 5:00am and shut off again at sunrise. The clock is mechanical so it is adjusted the old fashioned way and the photocell sensitivity is adjusted with a little black tape partially blocking the sensor. Not as sophisticated as your micro-controller but it has worked for years with little maintenance other than new light bulbs and resetting the clock after a power failure.
Seems like the value added from a utility perspective is little in comparison to many solutions that already exist there (many solar lights for gardens and walkways switch on automatically, albeit without a real time clock). If cost of adding ALS changes the lighting solution cost, it may not be worth it. I can get a timer for multiple circuits and control on-off times (the XMas tree controllers for example).
NASA's Orion Flight Software Production Systems Manager Darrel G. Raines joins Planet Analog Editor Steve Taranovich and Embedded.com Editor Max Maxfield to talk about embedded flight software used in Orion Spacecraft, part of NASA's Mars mission. Live radio show and live chat. Get your questions ready.
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