Products > Test Equipment

finding short on motherboards with a shorty (with display)

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Mikka:
Hello guys, Hello Kripton,  :)
Is there any progress with device or code ?
Just collecting all necessary components to build one "shorty" also, so would like to know if you guys found some flaws or problems or you can suggest some improvements. Thank you.  :)

kripton2035:
sorry lots of work with other projects. this shorty has been put on the side for some time now...

slbender:

--- Quote from: kripton2035 on June 17, 2022, 07:50:35 am ---sorry lots of work with other projects. this shorty has been put on the side for some time now...

--- End quote ---

Somehow I think there is a market of at least 100 units for over 300 people have viewed a lot of the photos posted.  Myself, I would just want something that either I can solder and complete in less than two hours, to a working product, or a complete wired unit with both audio and display.

Being hard of hearing since a child, the audible part may be of little use for me, but the display should have as much resolution as possible.  I have an older 2 digit “Dick Smith” ESR meter, and a “Cap Wizard” analog meter, these shorty implementations seem to serve a whole other set of needs, just as a function generator, a frequency counter, and an oscilloscope work in conjunction.  I would think these “shorty” units as much like a cross between the $20. Chinese transistor L/C/R tester’s, and a poor man’s Huntron Component Tracer/Curve Tracer.

Obviously several people have done interesting and excellent work on this over the past 18 months, so there are likely a few units gathering dust in a pile, or falling off the edge of a workbench, that could well serve the purpose of someone with half a dozen Windows X86 notebooks and MacBooks in assorted states of failure and decline, as well as other items in need of repair.  So while working on your later and greater versions and revisions, LMK of a working unit either listed on evil bay, or ready to ship out to New York, thanks!

Steven

FlightMech:
I am also interested in purchasing two of the  PCB's or the gerber file to have some made as you discussed as a possible option.

A version with SMD's would be wonderful.  Nicely designed.

I like your coding style. Elegant!

jdobry:
Hi all!

I want to refresh this toppic, because I am trying to redesign this tool. Replace Arduino by STM32G030F6P6, replace power source from 9V battery to 2*AAA, make it handy like a pen with wire tail, completely in SMD. It also have electronic power switch with ability to power off on inactivity.
It could be powered from anything between 0.9V~3.3V (2*AAA is perfect compromise. Small enough and will not have problem to provide ~50mA for measure current)
Pen like case will be 3D printed.
Now I have working prototype with incomplete SW (for ex it not have propper beeper).
This is something like reques for comments, I plan to publish it in 1-2 months.

Video demonstration https://youtu.be/Kq8dAxyf5MA (sorry for the czech comment, but it not need any comment. It just works)

Schematics https://drive.google.com/file/d/1Hv3r33Petv981_9jP7f_VT0lKGmp4XNd/view?usp=sharing

And some pictures https://photos.app.goo.gl/9pkDtEAfapqZDasC6

Note about battery state measurement. On scematic there are two options.

* R26 - direct connection to battery. This design have minor problem with current leak thru R26 into pin of unpowered MCU
* U7+R24 to cut-off battery from MCU completely
After tests I am using option 1. (R26). Current from battery on power-off state is ~0.5uA (whole device). It is acceptable. Measure error caused by high impedance of R26 is ~3.5% and it could be compensated by SW. It is more than enough for battery indicator.

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