[ot][spam][crazy] The Trials of Controlling a Programmer

Undiscussed Horrific Abuse, One Victim of Many gmkarl at gmail.com
Thu Apr 7 13:32:34 PDT 2022


I tried a new cable on the dso nano and it works much better. So, flashing
the firmware of that is available now.

On Wed, Apr 6, 2022, 3:23 PM Undiscussed Horrific Abuse, One Victim of Many
<gmkarl at gmail.com> wrote:

> I asked in the old rtlsdr chat regarding this and learned about buffering,
> and electrical engineering concept.
>
> Without sorting buffering out, I did find I have an optoisolator, a
> potentiometer, and a few transistors from the nyansat kit. I wired the
> potentiometer in and just judging it visually, it kind of looks like there
> is a weak association between value and voltage from 0V-1V and then a very
> strong association from around 1V-1.4V or something like that. It reminded
> me a little of the shunt resistor diagram from the laptop. (I also saw
> different, less distinctive, behavior when reverse polarized).
>
> I recall there were also strong spikes seen when tuned to a frequency,
> when the voltage changed.
>
> So basically this isn't going to be an oscilloscope quickly, but would
> indeed work as a quick and messy logic probe.
>
> I'm thinking I might just kind of move forward on logging data from the
> lines in any adhoc manner that can be correlated.
>
> The rtlsdr maybe has more utility than the oscilloscope here, because it
> has an api I can wire to data storage and event information. Even if the
> signal is heavily transformed by shoddy circuitry.
>
> I do not have anything visual at this time. I am just looking at scrolling
> numbers.
>
> Assuming I can work through the double inhibitions, logging multiple
> event-synchronised signals and plotting them would be a good step for me.
>
> Maybe in c/c++ so the code would be easily portable to a more embedded
> device that might be capable of bitbanged probing.
>
>
>
>
>
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