@LeoDJ@chaos.social
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LeoDJ

@LeoDJ@chaos.social

Programmer, Tinkerer, Nerd | likes everything from hardware over firmware up to software | active at https://chaos.social/@cfhn

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LeoDJ, to random
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Latest project in the category "Is it actually useful or just an elaborate ?": !

It's a fully self-contained, USB-C-powered, 2-channel DAC + 5W Class-D amplifier inside a connector.

Use it to connect your phone / laptop to any passive loudspeaker and enjoy surprisingly loud music (probably enough to host a room party)

(GitHub link for the interested: https://github.com/RainbowLabsDE/USB2Speakon )

A USB A->C cable plugged into the USB2Speakon. It also works like that. But it just looks wrong :D
The USB2Speakon plugged into the back of a subwoofer with pass-through and a connected yellow USB-C cable leaving the image.
The finished test setup. A loudspeaker on top of a subwoofer to which the USB2Speakon is connected. A Framework laptop is connected to the other end, providing the power and audio signal. There is nothing else connected to the speakers other than the USB2Speakon and laptop.

LeoDJ, to random German
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Schaufensterpuppe wird getragen, Kopf fällt dabei versehentlich ab und dotzt mehrfach auf den Boden

$Franzose: "Sorry, französischer Reflex"

LeoDJ, to random
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Bosch/Siemens: How should we name our proprietary data bus inside washing machines etc.?
Nobody:
B/S: Yeah, let's call it D-Bus!
https://github.com/hn/bsh-home-appliances?tab=readme-ov-file#d-bus

cato, (edited ) to random
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RS-485 transceiver of choice

LeoDJ,
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@cato
<anything>3485

18+ LeoDJ, to random
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Provided without context...

LeoDJ,
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@manawyrm
I am :3

cato, to random
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"I just need to implement a bootloader" he said, unaware of the fact that the Cortex M0 core lacks a vector table offset register, making switching between two user programs a lot harder 🫠

LeoDJ,
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@cato
Is it wasted if you learned something new / gained some new insight?

cato, to random
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Just noticed that I have a docker-compose.yml for one service which uses the "latest" tag 🤢 time to fix that. Ugh, the thought of non-deliberate updates is just gross

LeoDJ,
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@cato
not on restart, but on the next docker-compose up, e.g. if you updated some minor config thing

LeoDJ,
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@cato
Yes, but iirc it recreates the container (and thus pulls the new image) if you made a change to the yaml (like e.g. change a port or something other small).
But maybe I'm misremembering or it changed ^^"

LeoDJ, to random
@LeoDJ@chaos.social avatar

I'm currently in the process of designing an for my new .

I need the (lower latency), but don't want it sticking out and losing a whole slot.

So I'm going to throw a USB hub and the peeled dongle on a PCB and hope it all works out :D

As a further experiment, I routed the USB A SS lines past the hub (USB 2 D+/D- connected to port 1 of the hub).
Not sure if this will play nice with USB drivers, but it's worth a try.

A 3D render of the custom PCB

cato, to random
@cato@chaos.social avatar

"why is my nextcloud not responding"

photoprism fucked up and hogged the CPU

you can see the energy consumption at home dropping as soon as I killed it lmao

Grafana graph showing power consumption dropping from about 130W to about 100W

LeoDJ,
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@cato
Can you correlate the behaviour to logs?
It should log (or have a setting to log) every file it finds e.g.

LeoDJ, to random
@LeoDJ@chaos.social avatar

Anybody got some recommendations for a low-pain USB PD stack / MCU?
It has to support PD3.1, especially EPR.

I have skimmed the offerings from Cypress (Infineon), STM and WCH, but none have yet convinced me to any significant degree...

Are there some stacks/libraries that are commonly used on that make it easier to get started?
Maybe some example code for an EPR source?

:BoostOK:

cato, to random
@cato@chaos.social avatar

I updated my WLED controller yesterday and ever since, one of the two segments (part of the same WS2812 chain) reacts with a few seconds of delay when commanded from home assistant. What the heck

LeoDJ,
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@cato
Simple: Just never update xPP

18+ cato, (edited ) to random German
@cato@chaos.social avatar

So was dummes. Jetzt kann ich hier auch Sonntags nicht mehr im Mini-Supermarkt (ohne Personal!) einkaufen, weil es ja ein TaG dEr RuHe UnD sEeLiScHeN eNtSpAnNuNg ist. Ja fickt euch doch und den ganzen dummen religiösen Bullshit, der die Scheiße verursacht!

https://osthessen-news.de/n11754858/oeffnung-der-kleinen-sb-shops-an-sonn-und-feiertagen-gerichtlich-untersagt.html

LeoDJ,
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@cato
orrrrrrrr wtf ey

LeoDJ, to random
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Now introducing: !

1.7 kW worth of raw USB-C PD power.

24x USB-C ports.
4x 100W, 20x 65W.
(4x USB A, but we don't talk about those :P)

I never did a post of the project that @techbeard and I did last-minute before , so here you go.
Build log in the thread below.

Back view. The back consists of another milled PCB that holds the Powercon True1 power input socket, the XT60 24V power output plug and a large OLED screen.
View of the OLED screen in action at the Geekend Aalen '23. It mainly shows (a rough approximation) of the overall power draw and some internal stats.
The being utilized pretty heavily at the Unterland village at CCCamp23

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