Breaking News
Comments
Newest First | Oldest First | Threaded View
anne-francoise.pele
User Rank
CEO
re: Intelligent lighting controller measures ambient light and tracks time
anne-francoise.pele   7/16/2012 3:25:01 PM
NO RATINGS
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
User Rank
Blogger
re: Intelligent lighting controller measures ambient light and tracks time
DrFPGA   3/19/2012 4:15:05 PM
NO RATINGS
Seems like connection with the security system might be a more important feature and where some digital control/sensing would be useful.

docdivakar
User Rank
Manager
re: Intelligent lighting controller measures ambient light and tracks time
docdivakar   3/16/2012 7:08:13 AM
NO RATINGS
@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
User Rank
Rookie
re: Intelligent lighting controller measures ambient light and tracks time
wb9ddf   3/15/2012 6:51:15 PM
NO RATINGS
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
User Rank
Manager
re: Intelligent lighting controller measures ambient light and tracks time
docdivakar   3/14/2012 2:17:29 PM
NO RATINGS
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



Flash Poll
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Fist Bumps & the Zombie Apocalypse
Max Maxfield
24 comments
Are you concerned about the possibility of a Zombie Apocalypse or do you scoff at the thought of such an eventuality? If the latter, would you be surprised to hear that the US military has ...

Rishabh N. Mahajani, High School Senior and Future Engineer

Future Engineers: Don’t 'Trip Up' on Your College Road Trip
Rishabh N. Mahajani, High School Senior and Future Engineer
8 comments
A future engineer shares his impressions of a recent tour of top schools and offers advice on making the most of the time-honored tradition of the college road trip.

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
41 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Karen Field

July Cartoon Caption Contest: Let's Talk Some Trash
Karen Field
151 comments
Steve Jobs allegedly got his start by dumpster diving with the Computer Club at Homestead High in the early 1970s.

Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)