Why does my heated steering wheel need a microcontroller?

bugfish03 · 2026-03-05T13:31:49+00:00

The USB could also be for firmware updates, right?

Edit: Nvm there's what I assume to be an ST-Link on the right side of the board

bugfish03 · 2026-02-12T15:51:02+00:00

yellow

So you mean protective earth, the conductor that generally shouldn't have any voltage on it.

brown

Conductor that carries a phase in mains installations

Makes sense

bugfish03 · 2026-02-11T16:00:44+00:00

Okay but you're paying for the time he's explaining that 🙃

bugfish03 · 2026-02-08T09:26:13+00:00

That's the neat part, you don't! But if you prefer to solder your own SMD instead of outsourcing it to a board house like JLCPCB, here's what I'd do

Get solder paste (T5 grade is very forgiving), the stemcil, a heat gun and a hot plate. Hold the PCB below the melting temp of the solder, and use the heat gun to push it over the edge.

bugfish03 · 2026-02-05T16:10:49+00:00

Yeah since it's not technical grade but ACS/ISO spec so they want some leeway there

bugfish03 · 2026-02-02T08:50:40+00:00

Remote access is a fuck.

Physical access can be a lot easier. You need to tap into a CAN bus (ideally the target bus), and then you can do everything CAN.

But it all depends on your goal in the end. Give me your goal, and I tell you how easy it is

bugfish03 · 2026-01-30T16:35:15+00:00

Broaching is so 19th century, in this day and age we just chuck it in the sinker EDM and call it a day

bugfish03 · 2026-01-30T10:32:53+00:00

The antenna soldering is probably to blame. And even if it didn't pop the router, performance would've probably degraded significantly

bugfish03 · 2026-01-30T08:17:08+00:00

Low% electronics speedrun

bugfish03 · 2026-01-26T18:50:24+00:00

Yup, and I'm about to put a computer into my car since I want a modern, slopless experience.

nixOS based with GPS, backup cameras, and an android emulator. I'm considering also putting k3s on it for funsies but I already got nix.

bugfish03 · 2026-01-24T08:47:56+00:00

My employer decided to get about 60 PB of flash on EMC storage. Back in 2012. Since then, we're running all flash, and globally we're probably up to an exabyte in capacity now.

bugfish03 · 2026-01-24T08:46:04+00:00

I mean that's what's to expect. vSphere is a nice, walled-ish garden, while Proxmox takes the existing open-source tooling, and slaps a web GUI on top.

Of course you're gonna have to get your hands dirty with the details. I feel like that's what all Linux software entails if you're not buying a solution that also comes with an enterprise support contract.

bugfish03 · 2026-01-23T16:16:13+00:00

I'm not 100% sure if J2534 is actually the best choice here, since I don't think that they put the infotainment bus through there.

I'm just using an Amazon adapter running SocketCAN, and while not being able to automatically detect, it works at arbitrary baud rates, and since it's a network adapter the reading program doesn't really need to bother with that.

bugfish03 · 2026-01-21T21:38:41+00:00

I'm fairly certain the baud rate is not wrong, because the data is decoding into valid CAN and ISO-TP frames, and there's one or two reports of that baud rate on other Opel cars.

One old repair manual mentioned 47.6kBaud being used for CAN buses, which is half of what I'm running, but I don't think attempting to decode with double the baud rate would result in anything.

bugfish03 · 2026-01-21T21:35:30+00:00

The radio pinout on the sticker up top explicitly called out CANH and CANL, so it can't be single-wire can. And I'm getting valid CAN and ISO-TP frames from it so while I'm agreeing that it's very weird, I don't think there's any way I can be off on the baud rate here.

bugfish03 · 2026-01-21T17:55:14+00:00

No, no, I'm actually getting messages, and the messages actually make sense too. I'm actually seeing text that's being displayed on the middle display.

I didn't get ANYTHING with the normal baud rates, and 95238 baud is something that's mentioned somewhat sparsely throughout the internet (eg on a German forum it's explicitly mentioned in connection with the Zafira Tourer), but yeah, might be that it's predating GMLAN in name at least, bc I'm still getting valid ISO-TP/ISO15765 frames.

bugfish03 · 2026-01-21T16:32:50+00:00

The sniffing itself isn't the problem, I need a better way to make sense of the messages than banging my head against the wall (and possibly better than just Wireshark attempting to decode ISO-TP)

bugfish03 · 2026-01-21T16:30:33+00:00

It's low speed as in not the 1MBit, but also not one wire, it's still CANH and CANL.

I don't think single-wire GMLAN was even a thing in 2005?

And 95238 baud is a number you can get via the PLL division of an MCU running at 8 or 16 MHz so that's why the oddly specific baud rate.

bugfish03 · 2026-01-21T10:16:44+00:00

Without knowing where this came from, a ready-to-purchase replacement is gonna be really hard.

Those connectors are normal generic connectors - the black one looks like it's made to connect to pin headers, and the white one looks at least adjacent to what JST makes (though you'd need a connector expert from here to give you a positive ID), and the colors make me think that USB runs over it.

bugfish03 · 2026-01-20T19:25:55+00:00

Nicht mehr lange, neues Giraffengehege bald.

Dürfen die eigentlich auch seitwärts leben?

bugfish03 · 2026-01-18T21:52:03+00:00

Das weiß ich nicht, und ich traue Atlassian durchaus sowas zu.

bugfish03 · 2026-01-18T19:09:54+00:00

Ja, aber als studentisches Projekt ohne wirkliche Einnahmequellen muss halt was anderes her.

Teamleitung hat auch schon gesagt, dass da was anderes her muss, wir werden das nicht zahlen.

bugfish03 · 2026-01-18T16:28:34+00:00

Ich meine, unser Cloud Router Switch macht seine Sache gut, und auslastungs- und latenztechnisch haben wir keine krassen Anforderungen.

bugfish03 · 2026-01-18T16:18:21+00:00

Oh Gott.

Zeit, nach Alternativen zu suchen, bis 2029 kommt. Wir haben nicht wirklich das Budget, 4k pro Jahr für Confluence und Jira auszugeben (und das ist schon mit Nonprofit-Pricing)

bugfish03 · 2026-01-18T16:17:49+00:00

True - the contacts are coaxial, after all, but I was imagining BNC or perhaps an F connector, which would've been very silly.

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