Electronics > Repair
HP 34401a DMM with leaking segments
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qu1ck:
Firmware and hardware is released.

I only have mechanical considerations left to resolve I think. I.e. how to mount the display.
qu1ck:
As luck would have it the metal shroud of the old screen fits new screen pretty much perfectly.
Even existing small flaps that used to hold the glass panel can now hold the display pcb eliminating need for any screws!



On the left the pcb slightly leans on the big fat MCU, in the middle shroud flaps are over it and at the far right end shroud flaps are under it. That creates small tension in pcb which is enough to hold it in place pretty well.



This is how it looks like in the panel:



And the satisfying conclusion to this endeavor:





One thing that is not ideal is the front glass being quite thick requires a usb cable with long connector end, your standard phone cables will not click in.

But while this is a conclusion for the project it's not the end for firmware. I still have not utilized the onboard eeprom, which I plan to store settings in.
Changing contrast on the fly, displaying a label in place of the bar graph, custom fonts and ability to display bigger digits at the expense of bar graph are on my radar.
You can follow the firmware github repo for future updates.
bitseeker:
Amazing how well all the new bits fit in place. Congrats on a very cool and successful display upgrade.
mlefe:
Excellent work!!  :-+ :clap:
qu1ck:
Thanks

Now I have 10 boards I can send out and 1 mostly working VFD screen :D
Anyone who wants a board can pm me, we will exchange addresses and I will send you a board in exchange for a fridge magnet. I like fridge magnets :)
Doesn't have to be a big one, something that can be send with ordinary mail is fine. if it's connected to your local landmark that would be great, but anything will do.
I don't expect to receive a lot of requests, but in case I do priority will go to users who posted in this thread.
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