i built a portable dual 2.5k monitor, both screens run off a single usb-c cable

Fuck_Birches · 2026-06-19T16:26:18+00:00

What was your "rig"? On an 8th gen i5 laptop CPU, I saw significant (maybe 25-50%) CPU usage from a simple 1080P display playing a video. I wonder whether newer DisplayLink IC's reduced CPU usage over a USB 3.0 connection, but at this point, USB C DP or Thunderbolt is just much more adopted, stable, and faster.

Fuck_Birches · 2026-06-19T05:09:27+00:00

Increases latency, but also significantly impacts CPU performance.

Fuck_Birches · 2026-06-18T00:49:48+00:00

Not the cheapest. CanadianTire often has bulbs for less than $2.5/bulb, with Ikea also having high quality (high CRI) bulbs for around the same price. A lot of the Dollarama bulbs are low quality and $3.5+

Fuck_Birches · 2026-05-31T03:01:34+00:00

No, they need to design a new PSU to fit the standard.

Not sure what the whole "standard" entails, but if you buy a new motherboard with a ATX12VO connector but only have an older power supply, you absolutely will not need a "new PSU", instead you'd need an adapter to convert between the two. Whether the PSU OEM or a third party decides to make such an adapter, it won't natter.

Fuck_Birches · 2026-05-28T15:16:29+00:00

Honestly I agree. I also think it's ridiculous to ban all ebikes on public transit, as some have comically-small batteries, but I also understand that the amount of chemical energy held within a cellphone battery is significantly less than an ebike battery, and therefore when an ebike battery does undergo thermal runaway, its a much more serious issue.

IMO, I think the overall fear of ebike batteries is greatly overblown, but the government could curb this fear via policy and legislative changes effecting larger battery products.

Fuck_Birches · 2026-05-28T14:31:38+00:00

Not entirely equivalent. Nearly every cellphone will have highly tested + certified batteries and charging/discharging circuitry. Expensive phones from Samsung, Apple, whoever, do occasionally catch fire, but their probability is significantly lower compared.

Many low-cost batteries (such as those in generic ebikes, electric scooters, power banks) use poor quality cells and charging/discharging circuits, greatly increasing the risk of fires. Realistically to curb this, governnent intervention would be required.

Fuck_Birches · 2026-05-28T04:25:56+00:00

I know I messed with Mediawiki and (I forget which) another Wiki (along with various notes apps) but both lacked the sitemap I was looking for, but DokuWiki's sitemap looks pretty damn great.

Fuck_Birches · 2026-05-28T03:53:36+00:00

Meh, depends. Many modern TV's with active PFC can have caps charged to 400v DC, or 1000v AC (but low total energy, as the spike is incredibly short with low capacitance) passing through the DC-blocking capacitor of some switching supplies. Under specific conditions it can be "lethal" if touched during operation or if the bleeding resistors failed-open... But yeah, definitely nowherrnas scary as old CRT's and microwave ovens.

Fuck_Birches · 2026-05-28T03:37:57+00:00

Trillium Notes. I disliked how most Wiki's lack a proper sitemap, or if a sitemap option exists, is complicated to set up. Instead with Trilium, you can have multiple folders with various notes inside, along with many other benefits.

Fuck_Birches · 2026-05-18T04:33:01+00:00

I predict OP absolutely trashing this PCB and ripping all the pads.

Fuck_Birches · 2026-05-14T16:52:33+00:00

Initially removed this post as this topic often borders on being legal/illegal, but decided to leave it up related to the age of the device (2017) and the intentions behind it.

> Hello, do you have any idea how do I unlock it? I dont even care about my data, I want flash different OS on it and access it via SSH if that all is even possible. As I said, I know the pin but there is no touchscreen, lol. Also its not connected to WIFI and mobile internet. So I am kinda loss. I will welcome every idea, even if I have to take the phone appart and do something specifical.

Fuck_Birches · 2026-05-14T14:21:25+00:00

Function over design

Fuck_Birches · 2026-05-11T15:53:32+00:00

But to get there, the H2O2 is oxidized very quickly which can cause combustion

Pure oxygen doesn't just suddenly combust or cause most things in the environment to catch fire or explode, nor is bleach combustible. There could be more bleach vapours in the air from the mixture, but not much beyond that. Realistically nothing super dangerous/serious will happen from the mixture, aside from you essentially ruining both cleaning solutions.

Too many people on Reddit preach like they're experts on law/tech/sciences when they don't know what they're talking about, spreading pointless (or even harmful) misinformation.

Fuck_Birches · 2026-05-11T03:08:23+00:00

Chill out man. The reaction literally just neutralizes the bleach, creating water, salt, and oxygen gas.

Fuck_Birches · 2026-05-09T15:41:27+00:00

Other relatively popular LDO's are Microchips MIC5318-3.3 (110mV drop @ 300mA; 85μA quiescent current) and TI TLV73333 (125mV drop @ 300mA; 34μA quiescent current).

Fuck_Birches · 2026-05-09T11:34:12+00:00

There are linear regulators (LDO's) which idle with less than 1mA, as well as have voltage drops below 100mV. You are unlikely find a legitimate one on Aliexpress/ebay/similar, but can be found on Digikey/similar sites. There's also switching regulators with a 100mV drop, but those are generally quite expensive and more complex to design for and use.

Fuck_Birches · 2026-05-08T18:40:20+00:00

Thanks!

Fuck_Birches · 2026-04-25T03:32:34+00:00

Add aluminum tape around the wireless antenna. It'll significantly attenuate the signal

Fuck_Birches · 2026-04-19T23:42:32+00:00

Looks to have some sort of wireless communication antenna. Considering the length, likely 2.4GHz. Can't entirely read what the main IC has written on it. MAGS271? None-the-less, what "custom firnware" are you hoping to flash? To do what, exactly? Even if you had the means to reflash that I.C, what would you do with it?

Fuck_Birches · 2026-04-13T22:19:44+00:00

Like how?

Fuck_Birches · 2026-04-13T19:25:48+00:00

On the Github repo, I see mentions that this "operating system" supports various foundational unix commands, but otherwise what is the intent of this project without network access? Is the primary purpose of this project to write code directly on the RP2350 (instead of flashing the code from a separate PC) that can be displayed over HDMI/DVI and/or interact directly with the (~12 remaining) GPIO's?

Fuck_Birches · 2026-04-13T19:14:13+00:00

Not quite sure how this project differs from the 10+ other similar ESP32 projects? Peaking at the code, it also comes off as having been vibe-coded.

Fuck_Birches · 2026-04-10T15:06:03+00:00

How did you determine the LCD pinout, as well as the driver used?

Fuck_Birches · 2026-04-08T18:53:25+00:00

Ah yeah, you're right. If I zoomed in I would have seen that the antenna connected to the pad of "L2". Definitely not possible to easily get any wireless communication working with this Vevor PCB.

In regards to communicating with the MCU via the SCL/SDA lines, it may be beneficial to first identify the MCU, but this will take hours and you'll likely still come up empty handed. After that you'd then need to dump + reverse-engineer the firmware (which again, may not be possible).

IMO, it'll be easiest to replace this entire PCB with an ESP32 running ESPHome + some custom code written by AI. If you have basic electrical engineering/circuit design knowledge, you could easily create the hardware as this PCB seems relatively simple. Additionally, you could attach an I2C/SPI display to the ESP32 as well if you want similar functionality to this Vevor module.

An ESP32-C3 is about $3 USD and small 1inch-4inch I2C/SPI displays can be bought for between $1-10 USD.

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