cross-posted from: https://discuss.tchncs.de/post/69696447

Have you ever been to Tibet?

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[–] 12 points 2 weeks ago* (1 child)

Now let's talk about LED displays. Can we talk about LED displays, please, Mac? I've been dying to talk about LED displays with you all day, OK? "Charlieplexing" this name keeps coming up over and over again. Every day Charlieplexing is getting sent back to me. Charlieplexing! Charlieplexing! I look in the LED display, and this whole pinset is Charlieplexed! So I say to myself, "I gotta find this protocol! I go to wikipedia and to look up how to connect to the LED display with my goddamn hands! Otherwise, I'm never going to get this LED working and I'm going to keep coming back to this same display." So I go to the Charlieplexing page and what do I find out, Mac? What do I find out?! There is no Charlieplexing. It's not even real protocol, okay? So I decide, "Oh shit, buddy, I gotta dig a little deeper." There's no Charlieplexing? You gotta be kidding me! I got whole boxes full of LED displays! All right. So I start marchin' my way through the voltages on my multimeter and I tap the contact pins on the board and I say, "Vooltage.... vooolltage! I gotta talk to you about Charlieplexing." And when I test the contact pins what do I find? There's not a single goddamn line of continuity on that board! There...are...no...Voltages on the board. Mac, half the pins on the chip go straight to earth. This circuit is a goddamn ghost town!

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