Electronics > Repair
HP 34401a DMM with leaking segments
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qu1ck:
The SSD1322 based OLED display came in the mail today.
Started reading up on the docs to figure out connections and protocol. Should be fairly simple to adapt my ili9481 code to it, except for the 4 pixels per column addressing. To write individual pixel you have to either read gram, modify and write or keep a frame buffer in sram.
Ugh.

On the bright side documentation is really good (kudos to buydisplay.com). Even though driver chip datasheet that they have on their page is preproduction version with huge watermarks and some TBDs in important characteristics (wanna know timing generator frequency? TBD, supply current? TBD, segment output current? tough cookies! TBD!) full final version is easily googleable. Other docs like their panel characteristics and code example are useful. Sadly no electric diagram of the panel. I'll email them just in case, maybe they will share it.

I'll try to code support for this screen in the upcoming days.

Also I have a great idea to enhance the usefulness of this mod, won't spoil it just yet ;) (I don't know if it will work out).
bitseeker:
Oh, the suspense! :popcorn:
coromonadalix:
maybe this datasheet may help : https://www.newhavendisplay.com/app_notes/SSD1322.pdf
qu1ck:
coromonadalix thanks, found that link as well.

Seller replied, no schematic for us :--
But it's easy to identify the switching IC (sot23-5, top marking looks like 1b3gc, could not find anything in online smt code databases). It has a big tantalum and an inductor next to it. I think just ripping that one out and supplying 12v directly will do fine. But that's a later step, for debug and prototyping simply powering everything from external usb works fine.
coromonadalix:
an future competitor to the 6 1/2 digit meter thread here  lolll
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