Electronics > Projects, Designs, and Technical Stuff
uSupply Custom LCD
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IanB:
Consider an alternative view though. Many people really like the older test equipment from HP and other manufacturers because they have available full schematics and service manuals. This means that people have a chance to repair and maintain the equipment long after it was made.

Now consider that a problem with custom manufactured parts is that if they fail and need to be replaced an original replacement may not be available. However, even if the actual part cannot be obtained, a documented interface spec may at least permit some kind of equivalent to be constructed.

So my comment is not about OSHW any more than classic items of test equipment were OSHW. My comment is about maintenance and repair by future owners.
EEVblog:

--- Quote from: wilfred on October 29, 2017, 09:23:37 am ---Dave said in post #66
"and right down the bottom:
5) Think about were OSHW comes into it."
This thread is not supposed to be a place for OSHW discussion (post #94) so it might help if it wasn't referred to as an open design since that is a right down the bottom of the list consideration. And possibly an unwelcome distraction.

--- End quote ---

Why don't you drop it Wilfred?
The design will be open, just because it's not in a way you approve of doesn't mean others should drop it.
wilfred:

--- Quote from: EEVblog on October 29, 2017, 10:29:57 am ---
--- Quote from: wilfred on October 29, 2017, 09:23:37 am ---Dave said in post #66
"and right down the bottom:
5) Think about were OSHW comes into it."
This thread is not supposed to be a place for OSHW discussion (post #94) so it might help if it wasn't referred to as an open design since that is a right down the bottom of the list consideration. And possibly an unwelcome distraction.

--- End quote ---

Why don't you drop it Wilfred?
The design will be open, just because it's not in a way you approve of doesn't mean others should drop it.

--- End quote ---
Did I say drop it or move it to another thread?  This part of my post that you conveniently left off said:
"If you want to start a discussion on OSHW in another thread people might be interested in considering custom components as part of the equation. "

If anyone does want to discuss the definition of OSHW that I approve of then start up another thread. I haven't made up my own definition. I just use this one here https://www.oshwa.org/definition/
"Open source hardware is hardware whose design is made publicly available so that anyone can study, modify, distribute, make, and sell the design or hardware based on that design."

But I'm not particularly interested in a specific discussion about whether this project is or is not OSHW. It would be hypothetical until the design files are published.
xani:

--- Quote from: IanB on October 28, 2017, 11:20:14 pm ---Having just waded through this long thread from beginning to end, it seems nobody made the observation that seems important to me:

Regardless of the physical design and layout of the display, the important thing for an open design is that the information to be displayed and the interface to communicate that information is documented. As long as the interface is well defined, the use of a custom manufactured part is no longer a major problem. Anyone with knowledge of the interface can design a replacement for the display using any technology they like.

That's the key thing about systems design: modules and interfaces. Once you define the interfaces, you can redesign and replace any module with a different implementation as long as it preserves the same interfaces.

--- End quote ---

That's a software engineer perspective. Power supply is not just software.

If device has a form factor with a certain display in  mind you can't "just replace it" unless you find one in same size and connector (or possibly smaller). Especially if you are replacing a custom LCD.

So it does make hacking a much less interesting perspective. Now amount of people who hack will probably be pretty small. Like you might get 5% which will install custom firmware, maybe 0.1% which will actually modify code. But the moment you need to fuck around with replacing display you might as well re-do the hardware.


--- Quote from: Mr. Scram on October 28, 2017, 03:37:31 pm ---
--- Quote from: xani on October 28, 2017, 02:07:35 am ---Yes, that sub 1Hz refresh rate, really fucking amazing for power supply display. And that >40mA current when updating, also really fucking awesome for battery powered projects  |O

--- End quote ---
It can easily be more than 1 Hz. People even play console emulators on their Nooks. Also, zero consumption when not updating and partial update is available.

I'm not saying it should be e-ink, but let's be factual :)

--- End quote ---
Hey I just read that off datasheet from your own link to a product, 100% facts here. E-ink would just be a novel(and have obvious problems that are not that easy to solve unless you buy ready-made one, like backlight), LCD is just much better fit for the job
fcb:
Some of the e-ink demos I have seen do a full page refresh each time.  I'm not 100% sure if you can easily do a partial refresh (I stand to be corrected) - so lovely quality to the text but not appropriate for a PSU.

When I looked at them for a project they were very expensive, so I didn't bother looking more deeply into the technology.

+1 for a custom LCD
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