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Air Con: $1697 for an on/off switch

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Re: Air Con: $1697 for an on/off switch

#111
post #70

OMFG; I am in Perth, I have the same system, the very same problem and solved it almost the same way and was in the process of writing it up. The system uses RS422, with a base64 encoded AES key in the aaservice binary, and I was contemplating building an esp32 based open source implementation of the controller. That's a crazy weird coincidence.

For a small place there's a lot of sandgropers on HN somehow

Re: Air Con: $1697 for an on/off switch

#112
post #70

OMFG; I am in Perth, I have the same system, the very same problem and solved it almost the same way and was in the process of writing it up. The system uses RS422, with a base64 encoded AES key in the aaservice binary, and I was contemplating building an esp32 based open source implementation of the controller. That's a crazy weird coincidence.

Almost like all the tablets fail around the same time because they're made in the same shoddy way, forcing system replacements every so many years...

Re: Air Con: $1697 for an on/off switch

#113
Ranebo, post step by step instructions and full source code. Post full photos of circuit board and interconnects. Go fucking wild.

I’m contemplating writing an end-to-end manual for a set of laser machines I maintain, including missing schematics, gerber/eagle/fusion files and binaries for the MCU, how to flash it etc. Some parts which are required for servicing are only handed to manufacturer-employed technicians (I obtained those too from retired people). It’s been a riot to get everything and to learn how to disassemble, troubleshoot, fix, reassemble these machines.

But am I ever pissed at the manufacturer and the aftermarket for screwing people over. The markups on simple items are insane and they remove tags and IDs so you don’t know what the parts are. At this point I don’t care what’s proprietary information and what isn’t.

Re: Air Con: $1697 for an on/off switch

#114
post #4

> For whatever reason (I suspect some sort of storage failure) everyone’s tablets die around the same time. What a fun, completely coincidental quirk that that time appears to fall outside the warranty window, hey?

> What a fun, completely coincidental quirk that that time appears to fall outside the warranty window, hey? Isn't that the point of the warranty? They tell you they think the product will last for X years, and then it lasts about X years, just like they warranted.

HVAC systems are usually advertised as lasting at least a decade, but the warranty is usually only a year or two.

Honestly, I think something needs to be done so that companies are held liable for expensive products failing and needing expensive repairs after a year or two.

Re: Air Con: $1697 for an on/off switch

#115
post #77
post #71

Earlier quoted context omitted.

Incidentally, if you root your tablet you can just change the build.MODEL to "MyAir5" and everything will work on a third party tablet.

Oh, and you just need one of these and a TTL to RS422 converter off aliexpress to replicate the interface: https://www.aliexpress.com/item/1005005918675239.html The connectors on the small RJ45 daughter board are JST-SH 1.0 The yellow lead puts out 4.2v to replicate a Li-Ion battery (as far as I can tell). You can ignore this. Red is positive Black is negative Green is usb d+ Blue is usb d-

This is all fantastic info. I have included the details and a link to these comments at the bottom of the post. Great work!

Re: Air Con: $1697 for an on/off switch

#116
post #70

OMFG; I am in Perth, I have the same system, the very same problem and solved it almost the same way and was in the process of writing it up. The system uses RS422, with a base64 encoded AES key in the aaservice binary, and I was contemplating building an esp32 based open source implementation of the controller. That's a crazy weird coincidence.

sounds like the memory storage is failing on some sort of logging systems for these to be going down at the same time-ish (same number of logs per day written etc over cheap flash).

Shame on this manufacturer.

Re: Air Con: $1697 for an on/off switch

#117
post #70

OMFG; I am in Perth, I have the same system, the very same problem and solved it almost the same way and was in the process of writing it up. The system uses RS422, with a base64 encoded AES key in the aaservice binary, and I was contemplating building an esp32 based open source implementation of the controller. That's a crazy weird coincidence.

For a small place there's a lot of sandgropers on HN somehow

For those also wondering:

https://www.quora.com/Why-are-West-Australians-called-sandgr...

Re: Air Con: $1697 for an on/off switch

#118

Earlier quoted context omitted.

There's an easy hack for the contact lens (and maybe glasses?) situation. There is a consumer protection law meant to ensure eye doctors can't stop you from using any retailer you want (otherwise they'd essentially make themselves your retailer), and it works like this: You place an order with the retailer (online retailers typically allow you to simply type in your prescription values when adding lenses to your onli…

This sounds too good to be true. Having to get a prescription to get contacts is insane…

But how would you know what to order if you don’t have a prescription?

Trial and error? I guess that might work if you have a simple correction (no astigmatism).

Re: Air Con: $1697 for an on/off switch

#119

Earlier quoted context omitted.

Reminds me how, in USA, it’s the only civilized nation I’ve been to where you must have a prescription to purchase contacts and glasses. Everywhere else I’ve been will just sell you whatever magnification you need at the pharmacy. Obviously there is some acceptable line here, but I think the States handles this decently well enough. In Austin where I live you can get what is called a “homeowners permit” in a lot of c…

There's an easy hack for the contact lens (and maybe glasses?) situation. There is a consumer protection law meant to ensure eye doctors can't stop you from using any retailer you want (otherwise they'd essentially make themselves your retailer), and it works like this: You place an order with the retailer (online retailers typically allow you to simply type in your prescription values when adding lenses to your onli…

US based online contact vendors reject orders without a signed prescription. The doctors intentionally don't sign them. The workaround is to order them from Canada

Re: Air Con: $1697 for an on/off switch

#120
post #98

Ugh. The whole "smart aircon" industry needs a good-sized asteroid wiping them out of the existence. There is a very real need for modern variable-speed units, and vendors just keep fucking it up by using proprietary protocols locked into their ecosystem. TRANE in the US is similar. And this is really annoying because variable-speed pumps solve all the problems with short cycling and oversized systems.

You think this is bad? Try swimming pool equipment.

I think home EV charging equipment is heading in the same direction as well. Very few have local and open APIs and instead depend on the vendors cloud service for control.
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