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anne-francoise.pele
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re: Intelligent lighting controller measures ambient light and tracks time
anne-francoise.pele   7/16/2012 3:25:01 PM
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Click on the link below to check out the collection of Design Articles, Case Studies, Product How-To articles, Teardowns, etc... that have been published on Smart Energy Designline. Check back frequently. The list will be updated as new articles arrive. http://www.eetimes.com/design/smart-energy-design/4371743/LED-Focus

DrFPGA
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re: Intelligent lighting controller measures ambient light and tracks time
DrFPGA   3/19/2012 4:15:05 PM
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Seems like connection with the security system might be a more important feature and where some digital control/sensing would be useful.

docdivakar
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re: Intelligent lighting controller measures ambient light and tracks time
docdivakar   3/16/2012 7:08:13 AM
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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. MP Divakar

wb9ddf
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re: Intelligent lighting controller measures ambient light and tracks time
wb9ddf   3/15/2012 6:51:15 PM
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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. Fred Johnson

docdivakar
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re: Intelligent lighting controller measures ambient light and tracks time
docdivakar   3/14/2012 2:17:29 PM
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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). MP Divakar



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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