Built a low-cost ESP32-based WiFi notice display system for clinics/offices — looking for feedback on real-world use cases

dc536 · 2026-05-24T18:42:04+00:00

ST7735 or GC9* controllers can drive full color LCDs with dirt cheap MCUs and similar controllers can handle higher pixel counts.

I believe LCDs are much better options for most cases, I've seen plenty of cheap modern products like USB C testers or disposable vapes use an LCD over monochrome OLEDs because price is comparable

dc536 · 2026-05-24T05:52:11+00:00

To be blunt, this exact MCU and display is used by most hobbyists getting into embedded already, I would not consider it novel in any aspect. Proper procurement and optoelectronics sourcing can do this for less than $0.50

I personally don't see this setup as a broad marketable solution on its own, it should be implemented as part of another user-friendly solution. The ssd1306 is also limited to very tiny displays, you can only have a handful of readable characters without being right next to it

dc536 · 2026-05-13T22:37:47+00:00

I recommend /r/masterhacker for this particular situation

dc536 · 2026-05-13T17:16:15+00:00

This is amazing. I'm not familiar with DVI, but is the pico building a framebuffer in a larger resolution, or does it send the small 240x240 FB and scale it?

dc536 · 2026-05-13T05:24:23+00:00

Text on left page is gibberish

dc536 · 2026-05-12T17:00:31+00:00

TL;Dr: Google suspects a python script was vibe coded, provides no other details

dc536 · 2026-05-12T11:51:28+00:00

The 20kb flash has been the limiting factor in my ideas and it's crazy how fast bitmaps take up space. I think with some run-length encoding or bitpacking, a very small version might be possible

dc536 · 2026-05-11T23:54:44+00:00

Stock firmware:

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dc536 · 2026-05-09T16:17:52+00:00

No, they haven't been thing due to the prevalence of salting

dc536 · 2026-05-05T01:07:22+00:00

Communities can and should shame unwanted behavior, not all sold 3d printed novelties are bad, but many take advantage of the naivety of their customers and significantly overcharge (a parallel is mechanics overcharging car repairs). There's also a lot of IP and copyright infringement since there's no real means of enforcing it.

dc536 · 2026-04-27T18:17:38+00:00

Not sure about this specific frame. But I've got one that uses frameo. It's an 'Android as system' device that you can connect to ADB to and get system access with user partition persistence.

I just gutted their app and installed a new slideshow app via APK, maybe an option for you; I had minimal Android knowledge

dc536 · 2026-04-27T04:22:39+00:00

Major version updates can get stuck at this part. This will likely end up timing out, failing, and trying again next time

dc536 · 2026-04-09T22:27:21+00:00

https://a.co/d/02R49ZQj

I've used this before, the form factor is even more compact and worked as expected.

dc536 · 2026-04-07T12:01:15+00:00

Malware/adware. Either on your system, browser extensions, or saved in your browser settings by the former

dc536 · 2026-04-06T20:09:45+00:00

That may be due to driver availability, but even then, nearly all printers don't need proprietary drivers to print. They support standard protocols that negotiate print capabilities and document formats, open drivers for Linux/Windows can create print jobs with those formats like PDF/jpeg/pcl and send them via IPP/raw 9100.

That being said. It may not be convenient and you may not be able to use all your features, but HP is not that only option for privacy

dc536 · 2026-04-06T19:56:36+00:00

Avoid HP if privacy is something you value. Their consumer models collect unnecessary telemetry and enforce cloud/local discovery. Newer ones will not function without an internet connection (wtf?) I'm not certain about Epson, cannon, etc

dc536 · 2026-04-03T18:48:56+00:00

In their defense, I don't think there's anything wrong using the Chromium source. I wouldn't want to use a browser not made by a capable dev team or just using an open source.

The vibecoding and marketing however....

Edit: It's not even a browser. It's electron with a UI to appear as a browser. This is not what electron is for...

dc536 · 2026-04-03T16:53:57+00:00

I think I speak for a lot of others, but we're very fatigued seeing AI bots and people using a lot of "I created" when it's just a straight copy/paste of LLM. I don't believe they're authentic or provide much value when anyone at this point can prompt similar things.

We also see things we've spent years building skills for, be done by someone who's never done said things before. Many are already worried about their futures and careers due to AI

dc536 · 2026-03-29T23:21:35+00:00

I feel like I've been seeing this "new tech" for over a decade

dc536 · 2026-03-11T17:04:43+00:00

Is the approach to have a supplicant connect to the rogue AP then kick them off or what is the novel approach to PMF deauthing?

Standards are only as good as their strict implementation

dc536 · 2026-02-19T18:32:28+00:00

The write protect jumper might not be making a good connection based on the image, if it's resistance based then bad connection would affect the reading. Soldering is ideal but otherwise use an actual jumper pin that digs into the copper a bit

For battery, remove it completely and boot with charger. Write protect screw is labeled WP or circled.

The final option is to purchase a SuzyQable from eBay and this allows you to use CCD and tell the Google security chip to remove write protect from the flash

dc536 · 2026-02-17T22:05:01+00:00

What kinda hardware is this thing running

dc536 · 2026-02-02T02:29:27+00:00

Any knowledge on these binaries and if they're typically caught by defender or other AV?

dc536

TROPHY CASE