bigclive
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Addressable LED "resin blob" string
🕑 Added 2024-11-06 04:57:38 +0000 UTCThis was sent to me as being faulty, but I'm wondering if it had a software glitch or was maybe in timer mode.
But it's a great opportunity to explore the way the WS2812B addressable LEDs work, and how they are so data intensive that they have their own microcontroller just to send the data fast enough without worrying about other tasks like infrared remote control and the sleep timer.
Comments
Mike Page
If you use DMA you have no worries about timing. Of course you won't be using an 8 bit PIC! But Cortex M0 will do nicely. Maybe some of the new small RISC-V parts can do it. Just checked and it looks like CH32V003 - a $0.10 chip - can be programmed to do what's needed. I must get into those. Although the programming cost could be more than 10c !!
Mike Page
Unlike the WS2815, the WS2812B has no redundant data pin. A single dry joint can wipe out the whole downstream.
Big Clive
It sounds like they may have been pushing the timing to the edge.
Georg Zitzlsberger
I've had a related issue with some of these "controller integrated in the USB plug" devices related to temperature. Fairy lights over the window with a USB power bank (an hence the controller) sitting on the sill. In winter, after opening the window the temperature drop caused flickering... in a very reproducible fashion.
Big Clive
Ice machine dropping a load.
Charles Bruckner
what was going on at 06:28 sounded like she one knocking frantically LOL
Mike Hughes
Have you tried a generic remote control pad on it, to see if the IR is live? Then a rogue signal from Andy's home cannot be ruled out if it is working.
