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December 15, 2008
about 3 weeks ago
The FTDI chip is also capable of higher data rates (I have a project that pushes 2mbps to an Arduino Duemilanove) but this board is sadly hampered by the lack of headers that go to the FTDI’s flow control pins. Seems like an easy thing for Sparkfun to add, but so far it hasn’t been done.
about a month ago
Has anyone who has purchased one of these successfully signed up with their forums? This product looks interesting but the documentation is only available to customers with an invoice from a distributer. I’m not sure they will consider Sparkfun to be a distributer.
about 2 months ago
I imagine the circuit diagram looks exactly like a WS2812B LED strip. It’s just a chain of WS2812Bs with each DIN connected to the DOUT of another LED. According to the WS2812B datasheet, it’s 390-420 mcd per red LED, 660-720 mcd per green LED, and 180-200 mcd per blue LED. No idea about cooling.
The WS2812s act like a giant shift register. There’s no explicit addressing, so no potential address conflicts when chaining multiple displays together. You’re mainly limited by how fast you can update the display – longer chains take longer to update. I wouldn’t daisy-chain power, though.
Er, watt? 51W max/60 LEDs doesn’t make any sense. The WS2812s take up to 60 mA per LED (20 mA for each color). 5V * 60 mA * 60 LEDs = 18W. With 256 LEDs, this display could potentially take ~77W. I suppose 51W could be some sort of thermal limit that you shouldn’t exceed, but the “per 60 LEDs” spec still makes no sense.
If you’re wanting something portable, I’ve been able to drive a strip of 144 WS2812 LEDs (and an Arduino to control them!) directly off of a nominal 3.7v LiPo battery – no voltage boost required. YMMV.
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Arrrgghhh! The hardware flow control pins on the FTDI STILL aren’t brought out like they are on the Duemilanove!
News - Fluke, we love you but yo…
about a year ago
Reading the US ITC’s exclusion order, it sounds like Fluke can authorize imports. I hate seeing useful things be destroyed, especially an an environment cost. It would be nice if Fluke permitted Sparkfun to import these meters on the condition that 1) they are donated, and possibly 2) that they are modified (e.g. by a quick paint job) to not infringe on Fluke’s trade dress.
From the letter, it sounds like you can export them anywhere that Fluke does not have that particular trademark claim. Throw them up on eBay?
about a year ago
It would be nice if there was a thin version of this that would reliably work with DIP ICs… If that’s even possible.
No public wish lists :(
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