Jun 29, 2026, 8:57 PMBlurry picture of the PCB.
Very minimal: a couple resistors and caps, an anonymous 14-pin microcontroller, two little mosfets, and a 433 oscillator. So this thing is a 433mhz remote
- Jun 29, 2026, 8:57 PM
Replies
- Jun 29, 2026, 9:00 PM
It looks like those mosfets are for the oscillator and the antenna trace, not the LED. Makes sense I guess, whatever MCU this is can handle a low-power LED just fine
- Jun 29, 2026, 9:13 PM
If I'm using this SDR properly (dubious), it looks like it's using 433mhz channel 36, at 433.950khz
- Jun 29, 2026, 9:32 PM
I don't think I can decode or replay the messages it's sending with this specific SDR, I'll have to borrow a different one from my sister for that
- Jun 29, 2026, 9:44 PM
I googled it and found a couple other cases of people running into this kind of remote and getting confused because they're trying to decode the IR or replicate it and THERE IS NO IR, IT IS LIES
- Jun 29, 2026, 9:48 PM
it seems to be a clone of FCC ID 2AUSN-LXZK1021: LXZK-TX1021, a remote for lights, licensed in 2019
- Jun 29, 2026, 9:50 PM
has anyone hacked the FCC and leaked all their confidential PDFs yet?
I'm not saying anyone SHOULD do that, or that I'm eagerly awaiting the collapse of the US government so that I can pick through the wreckage, but it would be nice for us reverse-engineers if someone would leak all these FCC PDFs that explain how shit works
llewellyllewelly@sauropods.winJun 29, 2026, 9:12 PM@foone technically speaking, 433 mhz radio waves are also below red in frequency ... on the other hand, I suppose an antenna and a diode are a bit different ... and red isn't infrared. I guess 1 of 3 is the best you can expect these days. But wait ... does 433 mhz make it a ham sandwich?
Analog Alex πBriarheart@eldritch.cafeJun 29, 2026, 9:22 PM@foone oh you have a Malahit dsp2 :0
Why i am not surprised ? X)
(Was eyeing it and the tecsun for dipping my toes in radio listening).- Jun 29, 2026, 9:23 PM
@Briarheart It's actually my sister's, I'm just borrowing it
- Analog Alex πBriarheart@eldritch.cafeJun 29, 2026, 9:35 PM
@foone that explain what you said earlier x)
Well, wish you luck : I'll warm up the (metaphorical) popcorn.
Jun 29, 2026, 10:42 PM@foone @Briarheart
You clearly have a very cool sister :)
Poul-Henning Kampphloggen@expressional.socialJun 29, 2026, 9:26 PM434 (and 868) MHz a re unlicensed bands in Europe.
endrift 🏳️⚧️endrift@treehouse.systemsJun 29, 2026, 9:46 PM@foone There is no IR, only Zuul
- endrift 🏳️⚧️endrift@treehouse.systemsJun 29, 2026, 9:47 PM
@foone sorry I'm not Gen X I'm trying to delete it
Jun 29, 2026, 9:48 PM- endrift 🏳️⚧️endrift@treehouse.systemsJun 29, 2026, 11:29 PM
Jun 29, 2026, 9:52 PM@foone it would be nice, having the internal photos is certainly nice but oftentimes they're unconscionably bad and you can't make out the markings on chips
a.k.a. Odiegreen@forgi.socialJun 29, 2026, 10:28 PM@foone they often leak it on their own. I've seen confidential PDFs in test reports open to the public...
ThatHumanBeingThatHumanBeing@vivaldi.netJul 1, 2026, 12:33 AM@foone if you were given control of a federal agency of your choice what would it be, and why would it be the FCC?
- Jul 1, 2026, 1:03 AM
@ThatHumanBeing actually I've already answered this one before, and my answer was the United States Mint, because I have Ideas about how I'd fix the currency & coinage. well, "fix" is a strong word... "change" maybe.
https://bsky.app/profile/alice.averlong.com/post/3mowi7ucanc23
- ThatHumanBeingThatHumanBeing@vivaldi.netJul 1, 2026, 2:27 AM
@foone I forgot about your Mint ideas, I was thinking about you like to take advantage of the airwaves whenever the FCC can’t get mad because of a government shutdown
elektrobierelektrobier@mastodon.socialJul 1, 2026, 9:13 AM@foone we recently ran into a pair of dimmable switches used for USB lights. The remotes have a working IR LED but use radio too. The receiver itself is not even capable of receiving anything optical. We just found out, when we noticed one light turned on when we switched the other, couple rooms apart.
Jun 30, 2026, 12:01 AM@foone a flipper might be able to decode it.
Kerry Bentonkerrybenton@ioc.exchangeJun 30, 2026, 12:46 AM@foone I bought some lights similar to this and also went looking for ways to decode and replicate the remote & it looked spotty but maybe possible. I’ll admit, I was also mad that it wasn’t IR -_-
Jun 29, 2026, 10:00 PM@foone I made an RFLink adapter for my homeassistant setup and it listens for and can emulate a lot of remotes in 433Hz, though actual reception/transmission can be hit or miss.
I've captured and replayed several with my flipper zero as well.
keithkeithpjolley@discuss.systemsJun 29, 2026, 10:55 PM@foone i'm not seeing how to non-destructively open the case to see if this is the same board, if not must be a close relative of your remote. tested it's IR by holding my finger over it too.
Jun 30, 2026, 2:24 AM@foone That is, BTW, likely not an MCU. IR-Remotes tend to have tiny ASICS for the job. After all all it does is determine what button in a matrix is pressed and then send a data-word in one of the few standard formats like RC5 or NEC something.
Jun 29, 2026, 9:00 PM@foone what surprises me there is a real chip instead of an epoxy blob even if the identifying material has been lasered off
Jun 29, 2026, 9:05 PM@foone It seems like the sort of thing one does when one has already told everyone it's an IR remote, but got a really good deal on these RF components that yielded a better ROI, and didn't want to waste perfectly good marketing materials.
Henning Paul DC4HPhennichodernich@radiosocial.deJun 29, 2026, 9:07 PM@foone 433MHz crystals don't exist, looks more like a 433MHz SAW band pass filter to me.
Persephonemindpersephone@spookygirl.booJun 30, 2026, 6:02 AM@foone ee gads the hand made circuit board. rivet vias, giant blobs of solder. Some poor fucker with a soldering iron made that abomination. Probably next to a bowl of acid to do the board etching too. :|
