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October 17, 2012
News - Pride, Inclusion and Make…
Every usage of that emoticon that I’ve seen is as a heart. Rotate it 90° counter-clockwise and you should see the heart. I see what you are trying to do (it took me a couple reads to get it tho because you didn’t specify which direction to rotate the emoticon…), but I think it is attributing the wrong intent to NPoole’s post.
Regarding the term “queer”, Wikipedia actually has a pretty good history of the word (until someone changes it…) from the origin of the word in the 16th century just meaning “strange” or “odd”, to it’s use as a pejorative in the late 19th to mid 20th century, to the reclamation of the term by organizations like Queer Nation in the ‘80s up to now.
OOps, forgot to include the link (though It should be easy to independantly find): https://en.wikipedia.org/wiki/Queer#Etymology
I was first introduced to the Queer Nation when I went to college in ‘90 in western Massachusetts. I always thought of them as loud and obnoxious, but recognized that was a smart tactic at that point in time just to get on the social consciousness of the general population of which I was a part. The LGB (they were only using 3 letters at that time) Student Organization (or did they call themselves an Alliance, I’ve forgotten that detail) always put on the best campus dances.
about 6 days ago
I was just looking at the datasheet (again) and noticed for the first time the color specifications… About mid-way down the 2nd page in small text to fit lots of characters in a small table cell I find the following information:
W:6000-7000K / WW:2700-3000K / Amber:1800-2000K
But I don’t see any explicit mention of data order for communications. (I.E. how to map W, WW, and Amber onto RGB.) I guess figuring that out empirically is necessary.
News - The Web of Things Kit
The link for the two free chapters is broken. Looks like the page is encoding it as a local link instead of a remote link. https://www.sparkfun.com/news/bit.ly/wotbook
News - T³: Heated Blanket Teard…
Or is H1 to H2 the heater loop and SE1 to SE2 is some sort of sensor/feedback loop?
I’m not convinced that burned resistor is for the neon lamp. Following the traces for the neon bulb makes me think that the surface mount R12 (47k) is the ballast resistor.
It’s difficult to tell in the photo where the burnt resistor passes through the board, but I think it is attached to the SE1 wire. (The return for the H1 loop of the blanket?) Maybe the blanket only half works with that resistor blown. What blew that resistor? Maybe the H1 loop of the blanket is suspect? (Suspect electric blankets are fire-hazards, not something I would want to sleep under.)
Definitely a neon bulb. I’m not sure what life span, but as Member #134773 says they generally only work above 70-80V (depending on the specific model). What is interesting about them is with DC only one of the two electrodes inside will glow. Reverse the DC polarity and the other electrode will glow. I forget which one, but it might be the negative/ground side as electrons would be flying off that end and colliding with the neon atoms causing them to glow. (I could have my reasoning backwards though.)
If you have a variable DC supply that can supply up to 100VDC you can test this for yourself. Connect the legs of a loose (known working) neon lamp to your supply. Set the output to zero and then turn the supply on. Slowly raise the voltage until you see a little glow on one of the electrodes. Turn off the supply, and switch the lamp around and then turn it back on. The other electrode should glow. Be careful though. With too much voltage you could push too much current through the bulb. This will heat up the gas inside, and if the gas gets too hot it may cause the glass envelope to fail showering the surrounding area with glass fragments. So wear your safety glasses and/or do the testing inside a clear plastic bottle that would contain any glass shrapnel. This happened to a classmate of mine when we were doing a lab on inductive kick. She hooked her circuit up wrong and got a huge kick. Burned up the momentary switch and exploded her neon bulb with a bright flash. We teased her that her shadow was etched on the wall behind her. ;-)
With AC, each positive and negative peak cause the two electrodes to glow alternately. Persistence of vision causes us simple humans to think both are lit at the same time. (Remember, the DC voltage that causes the lamp to glow would be the AC Peak voltage. That’s why the AC and DC ratings for these types of lamps are different on DigiKey.)
I found this page with a Google search for “neon lamp failure modes”. Apparently the normal failure of these lamps is an increasing firing voltage, which translates to a higher resistance. Not something that would trip the fuse, so don’t be too confident that you found the source of the fuse failing.
about 3 weeks ago
Under-cabinet lighting idea. Setup motion sensors laid out alongside the strips. Program each sensor to control only certain sections of the strip. Normal lighting as amber, but under “activated” sensors have the strip white at a dial-configurable color temperature. Spot task lighting that follows you as you move side-to-side on the counter.
As a work-around, why not use local variables “cool”, “warm”, and “amber” to pass into the SK6812 control function in the correct order? FWIW functions really don’t care what you call the variables that you pass to them. And unless you are actually modifying/maintaining the function, why should us normal peons care what the function calls the values internally? C variable scope keeps one from interfering with the other.
Duh… I finished reading your comment… Sounds like a library that translates degrees K to pseudo RGB values and then passes the result to one of the existing SK6812 control libraries should be fairly trivial for someone who is versed in writing libraries.
News - Who You Gonna Call?
It’s really impressive how well Sparkfun seeded the brand new forum with what appears to be legitimate content. It’s almost as if it was already around… Oh… Wait… ;-D
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