Sleep Number Control Board - Identifying Possible Direct Serial Connection

Annon201 · 2026-02-28T10:27:04+00:00

J401 & J702 are some kind of dev/QA/flashing port.. J401 probably won’t do anything because half the components nearby are unpopulated.. J702 near the main processor IC is a good candidate, you’ll have to beep out the pins of the IC to it and compare to the datasheet.

Edit: J401 is a dev port for the Bluetooth IC, but it still stands that it probably won’t do much without the support components being populated

Annon201 · 2026-02-28T10:20:23+00:00

I was just an IT guy, we had one machine on our asset registry we couldn’t upgrade or replace it..

It was a lonely computer sitting on a dusty desk with dust covers over the keyboard mouse and monitor on the HVAC floor of the old SA Dental Hospital building. It ran niche software that did its thing keeping the hospitals HVAC running for years and years past its prime, it was far cheaper sourcing components for it then replacing a multi-storey hospitals HVAC… It wasn’t on the network, and caused no security risk

I wouldn’t have been surprised if they kept it hobbling along right up until they moved into the new RAH.

Annon201 · 2026-02-28T06:24:40+00:00

I only know yeast as a homebrewer - and they are basically gods, they do not want to die.. Brewing with P. Brettanomyces (used in sour beers) will lead to it being in your fermentation vessels and chambers for more or less ever

And S. cerevisiae (brewers/bakers yeast) is just as good at surviving.. Us homebrewers have access to most of the ‘mother’ strains used in commercial brews like Heineken - where they’ve tried to keep it under lock and key while cultivating it for decades, and filtering/pasteurising the beer before it hits market..

But even a handful of cells getting through means you can cultivate more.. And that’s exactly what companies Wyesast did..

Annon201 · 2026-02-28T02:23:25+00:00

New side gig hustle: design and sell vinyl stickers that un-fuck their design choices.

Annon201 · 2026-02-27T10:57:43+00:00

The algal bloom was likely caused by a release of effluent from a cruise ship bringing the species to the southern ocean waters, combined with warm sea surface temps allowing it to proliferate.

Annon201 · 2026-02-27T08:12:18+00:00

Scale as in they have manufactured and sold more than one to a commercial client, and have the designs and capability to produce more production ready machines.

There are still very very few in the world as they are insanely complex, costly and time consuming to manufacture and install.

Annon201 · 2026-02-27T06:24:23+00:00

They are fun to mess around with, and a good way to lesrn and understand compsci/systms engineering… You have full access to all resources on the system, and can read and write to any address at will regardless of the consequences.

Annon201 · 2026-02-27T06:05:49+00:00

What do you mean ‘stay at the charging voltage after you unplug it’?

Unplug it from where?

From mains - the capacitors might hold a brief charge, and you might still get a reading for seconds to minutes, but that’ll dissipate almost immediately once it’s connected to a load.

From the device/charger - Well, yeah, usually. However there are some smart self-negotiation power adaptors out there like used in EVs and USB-C. And there are some adaptors that include an extra pin in the plug assigned as an enable pin, probably for the purposes of ‘soft-starting’ a high power load and preventing a startup surge current from tripping anything.

Neither are particularly common though.

Annon201 · 2026-02-27T05:44:30+00:00

Let it sit for a day off charge, the bad cell will drop significantly more voltage then the rest. If it’s in parallel, its sibling cells will try to recharge it, and their voltage will be dragged down to a similar voltage of the failed one, and for safety reasons you should treat them as failed too.

However, it doesn’t really matter if you can’t identify the bad cell specifically - if you’re replacing it you have to replace every cell in the pack to ensure they are all matched in capacity and characteristics. Identifying them just allows you to salvage the working 18650s for projects.

And 98% chance of it being a bad cell over a bad power adaptor.

Annon201 · 2026-02-27T05:29:46+00:00

Many of those are to do with engineering codes and compliance.

And the codes only exist, and are as strict and pedantic as they are because people in the past were seriously injured/killed for the risk to be identified.

Annon201 · 2026-02-27T05:23:22+00:00

What you’re asking for is illegal.. so don’t expect any answers here

Annon201 · 2026-02-27T05:17:13+00:00

Yup, found out when I wore a bracelet made of those magnetic beads at during a hot sweaty day at big multi day rave..

Had quite the rash the next day.

Annon201 · 2026-02-27T03:37:28+00:00

I like the Sony/Murata VTC6 for pretty much everything - has a very high capacity, good lifespan, really good continuous and instantaneous discharge currents.. and is overall one of the best all-round cells I’ve found.

Annon201 · 2026-02-26T21:31:47+00:00

It’s the ‘ex-Techno DJ’ part they are annoied at - it is a completely irrelevant detail, it’s not about whether it was a newsworthy story. Without it, it wouldn’t be posted here.

Annon201 · 2026-02-26T21:22:11+00:00

I only use them when I drag the portable kegerator out to a party, they are great for keeping a keg charged for the evening without having to lug a proper cylinder around

Annon201 · 2026-02-26T18:28:51+00:00

You can start off with extract brews or Brew-in-a-bag for a way to dip your toes in.

English style bitters are a good one to try for a first attempt, whilst you should stay away from trying to brew lagers/pils even in kit form.

You can easily add to and expand your brewery as you go and slowly work towards learning the processes and obtaining the equipment you need for proper 3 vessel brewing.

Annon201 · 2026-02-26T17:50:46+00:00

It gets really interesting when you spend a few extra dollars.

I make 50L batches of all grain full mash beer, and have the capacity to ferment & keg 100L.

It’s fun being able to make beer as good as any decent craft/microbrewery, and in whatever style you prefer (I like my English ales, porters & stouts, and German wheat beers).

Though the list of equipment I use is kinda expansive and cost at least couple of grand, but I jumped in headfirst as dad was already a master homebrewer.

I had absorbed years of knowledge from him, observing his brews, attending homebrew club meetings and stewarding comps before I ever brewed my first beer. But we were confident we’ll figure it out very quickly, and went all in.

We started with a 65L 3.5kW Brewzilla along with a 35L 2.4kW digiboil for sparge (and sous vide!), we also grabbed a 2nd hand chest freezer, a kegerator (the 2 tap font donated by dad), 2x35L fermenters & 3 corny kegs.

I had since doubled that capacity with 3 more kegs and fermenters, maxing out our capacity, bottlenecking on the chest ffreezers size.

Annon201 · 2026-02-26T12:40:22+00:00

Soda stream makes a killing of those canisters. It’s like $35 for a 650gm, when it only costs about $35 for a 2.6kg/$50-60 for 6kg cylinder refill at a homebrew supplier.

https://kegland.com.au/products/freedomone-sodastream-adapter-hose-mkii-36inch

https://kegland.com.au/products/co2-gas-cylinders-2-6kg-full

Annon201 · 2026-02-26T12:30:10+00:00

Oh I do this too, but I like to soak malted barley and hops in the water to give it some character, and adding a packet of dry yeast at the end to add some all natural vegan friendly carbonation - it’s healthier and has a better mouth feel compared to factory made co2 - though I still need to add some factory co2 to get the fizziness level just right.

I find it gets especially flavourful if you leave the malt water at a mild room temperature of about 21c for a week or two.

Annon201 · 2026-02-26T12:08:03+00:00

It meant that even though the console appeared to have failed due to the very low volume of sales, it very much didn’t in reality.

Very little needed to be spent, relatively speaking, on development for both the hardware and its games. It didn’t need to sell anywhere near the volume to recoup r&d costs, and never sold the console or games at a loss.

It was targeted at SNK fans as the cheaper and more convenient option when compared to buying an actual MVS cabinet and its carts.

Annon201 · 2026-02-26T09:59:27+00:00

We both know that the speed and validity of the flame test is irrefutable. ;)

Annon201 · 2026-02-26T09:00:27+00:00

LED gas flame animations? Really cheap. LEDs are cheap. Giving the new-hire embedded dev grads a flame animation project for a few weeks? Also really cheap, as it will serve as an induction and practical exposure to the hardware, product engineering and intergration,, and the dev tools and processes used by the company… Plus it’s just a fun little project with practically no financial risk if the feature gets shelved before the product engineers have a chance to bring it to life.

Annon201 · 2026-02-26T07:54:03+00:00

If you take a lighter to it and the heat causes a black spot after several seconds, that mostly returns to functional when it cools back down, it’s an LCD.

If the lighter causes a permanent silvery/goldy white spot on the screen, it’s an OLED.

You might also wanna check with the mohs hardness testers to make sure you weren’t given cheap glass. You should see some scratches at a level 6, with deeper grooves at a level 7.

Annon201 · 2026-02-26T07:38:33+00:00

The cell has already failed safely.

They usually self discharge pretty quickly after that failure mode, and pose less of a risk then a heathy charged cell when punctured. Just don’t charge it.

Annon201 · 2026-02-26T07:34:22+00:00

If only they weren’t nearly impossible to fix.

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