Recently [shraiwi] decided to have a bit of good nerdy fun and implement the FAST machine vision algorithm on an ESP32-S3 using its SIMD ISA. This involves using the assembly instructions for the ISA, making for an exciting opportunity to become familiar with this part of this Xtensa Lx7-based twin-core MCU.

The Features from Accelerated Segment Test (FAST) algorithm is a corner detection method that can determine with reasonable accuracy and in real-time whether a given input frame contains said corners which thus may correspond to objects and other characteristics worthy of note. This is essential for machine vision, with machine learning able to bump up its recognition accuracy even more.

Implementing this algorithm on the ESP32-S3 proved to be a bit of a challenge due to somewhat limited SIMD ISA. Missing instructions included things like comparisons between unsigned byte values, and there is no support for direct misaligned reads.

All of these required some creative coding to work around, but in the end the ESP32-S3 running at 240 MHz was able to process a VGA stream in real-time at 30 FPS. This means about a 2x speed-up over a naive implementation using only non-SIMD instructions.

If you want to play along at home, the Platform IO project is made available on GitHub.

We’re big fans of pushing hardware into situations it wasn’t designed for here at Hackaday, but sometimes you’ve got to appreciate a nicely designed gadget doing more or less exactly what it was intended for — especially when it’s courtesy of code that’s freely available for you to run and hack on however you like.

That’s precisely what [mircemk] has done with their “Universal Timer” project. The 2.1 inch CrowPanel “Rotary Display” at the heart of the build combines an ESP32-S3 with a 480×480 round touch screen display and a rotary encoder.

The all-in-one device — clearly meant to be reminiscent of the Nest thermostat and similar commercial offerings — is technically all you need, but in this case it’s been joined by a PCF8574 I2C I/O expander which in turn is used to drive a buzzer that provides a bit of audio feedback at the end of the countdown.

With the code [mircemk] has provided flashed onto the board, the rotary encoder ring built into the housing makes for an exceptionally intuitive input for setting the desired time. It’s a bit like a high-tech version of the classic kitchen timer, as shown in the video below, you simply twist the ring and the graphics on the display rotate accordingly. Unlike grandma’s clockwork timer of old however, this one can change color as it nears zero, which makes it easier to estimate how much time remains from across the room.

As the popularity of smartwatches has brought the cost of these circular displays down, we’ve started to see some very slick projects utilizing them. The various efforts to turn them into desktop “radar” displays for nearby flights are a particular favorite.

These days, it’s common to give even very young children a mobile device loaded up with educational software that aims to improve everything from basic motor skills to reading and arithmetic. But even the cheapest phone or tablet isn’t the kind of thing most parents would like to see get destroyed, and there’s always a concern about giving children a device that’s capable of connecting to the Internet.

Which is where Braino! from [Ankush Pandit] comes in. This suite of applications can be easily flashed to a common Cheap Yellow Display to turn it into a legitimate educational tool. Combined with a 3D printed case, the total cost of the build is low enough that you don’t have to feel bad about handing it off to even the roughest of youngsters.

[Ankush] makes it clear that this project isn’t trying to sell you anything. You’re responsible for picking up a compatible CYD and installing Braino via the web flashing application. The software is released under the GPLv3 license, and it contains no ads, user accounts, or cloud connectivity. We know not everyone is thrilled with how much time young kids spend staring at screens these days, but opinions on modern parenting aside, it’s hard to find fault with the way things have been implemented here.

When the parent sets up Braino they can pick which of the 40 games can be accessed, allowing the experience to be tailored to the individual child’s age and ability. Should you decide to enable Bluetooth, some of the games even support wireless multiplayer between devices.

The commonality of the Cheap Yellow Display is one of its best features, and Braino does an excellent job of showing why that’s so important. Trying to develop a project like this without a standardized platform of some type would be a non-starter, but when anyone can get a CYD sent to their house from Amazon and flash it right from the browser, it’s makes the whole thing far more accessible.

Generally the DVB-S and -S2 standards require a satellite somewhere in Earth orbit to provide a signal to receive, but you can also transmit your own DVB-S2 stream with any RF transmitter if you’re so inclined. Courtesy of recent breakthroughs in using the RF hardware of the ESP32 on a raw level, [SP8ESA] has created the ESP32-DATV project using which you can broadcast a DVB-S2 signal using an ESP32-C3.

While a host PC side application handles the heavy lifting of turning the input video signal into a DVB-S(2) compliant signal, it is the ESP32-C3 that prepares the samples for transmission before sending them off to its RF block, with no external hardware needed.

If this brings to mind the idea of using an off-the-shelf DVB-S2 receiver to play back the signal, the frequency range for DVB-S2 is 10.7 – 12.7 GHz, while the ESP32-C3 is limited to roughly 2.4 GHz courtesy of it targeting only 2.4 GHz Wi-Fi and Bluetooth signals.

Using the ESP32 to transmit is already heating up.

Thanks to [ftg] for the tip.

When id Software released DOOM back in 1993 it helped define the genre, but it was hardly the only hit first-person shooter of that decade. There was also 3D Realms’ 1996 Duke Nukem 3D, a game which added some humor to the genre. Here’s [PicoPlus-devel], with pico-duke3D. It’s Duke Nukem 3D, on an RP2350.

Before reaching the conclusion that this might be obvious and easy, the three years between the two releases saw quite significant movements in the world of gaming PCs. DOOM’s minimum spec in 1993 was a 386 and 4 MB of memory, and would have been playable on a basic VGA card in an ISA slot. By contrast three years later Duke Nukem 3D required at least a 486DX2 and 8 MB, which would inevitably have had VESA local bus or PCI graphics. It’s a Quake competitor rather than a DOOM competitor, thus the power required to run it has stepped up a notch or two.

The RP2350 then is up to the job, and runs the game on a DVI equipped Pico clone. It can be controlled via either SNES or USB controllers given the right hardware, making it the perfect one-game console. The shareware game works, as does the full version if you own a copy. Having been around in the ’90s then, we’re curious. Could it be made to run Shadow Warrior as well? You no mess with Lo Wang!

Although the demise of the Zilog Z80 processor has long been predicted, it would seem that this moment has finally arrived. The owner of the Zilog name – Littelfuse – recently sent out PCN ZAC26-0074, notifying customers that they will be taking final orders for the eZ80 and all other microcontroller lines that they currently own.

Over at Mouser, eZ80 parts have correspondingly all been marked as “End of Life”. This comes a few years after the original Z80 and its peripherals were discontinued, with the eZ80 still being an alternative until now.

Any potential sellers will have to put in their orders today, with orders still accepted until December 21 2026, with final deliveries taking place throughout 2027 as Littelfuse winds down its MCU manufacturing. This means that for commercial customers are least this is pretty much the end of the road for any circuit that still uses the eZ80 or similar.

Many of us have fondness for the Z80, which also has led to a potential way that the Z80 can live on. This includes both the many open source cores that are compatible with the Z80, as well as real silicon courtesy of the TinyTapeout project.

Thanks to [Techokami] for the tip.

Before HDMI and DVI there was VGA, and before that? TTL RGB, in which instead of analogue voltages, the connector carried TTL logic voltages. TTL monitors used to be ten a penny because nobody wanted them in the VGA era, but the decades have not been kind to the TTL video aficionado. Stuck with a TTL card and no compatible monitor? Never fear, for [Charlysan] has your back with a TTL-to-DVI converter using an RP2350. The PIOs are used to sample the TTL input to a framebuffer, and the rest of the 2350 does the DVI magic using PicoDVI.

It requires a bit of level shifting hardware, which at minimum can be a set of resistors, and it targets the Waveshare RP2350-PiZero which comes with a handy ready-made HDMI socket. There’s a USB serial terminal to manage the thing, for which there’s even a TK GUI script.

This is the type of project which may never be center stage, yet performs such a vital function that it becomes indispensable. It’s not the first such project we’ve seen, a previous one did the same for VGA.

We’ve seen the GeekMagic SmallTV line of devices before — these cheap gadgets combine a microcontroller and a display in a little plastic case that can be used to show the time or weather. Powered by either an ESP8266 or an ESP32, the things could easily pass for a hobby build if it wasn’t for their professionally produced enclosures. In fact, we wouldn’t be surprised if GeekMagic lifted the idea from an existing DIY project.

As you might expect we’ve seen several hacks for these devices already, which usually involves replacing the stock firmware. But this latest approach is unique in that you don’t need to mess with the stock software, nor do you need to break out the soldering iron. By leveraging a built-in photo viewer function of the SmallTV [Yongha Kim] shows how you can get the gadget to display pretty much whatever you want.

The trick here is that the image is being generated by a machine on the network, say your desktop or server, and being pushed over to the SmallTV over HTTP. In this example the image is being generated in Python with the Pillow library, and [Yongha] has it showing Claude and Codex usage data, but you could really approach this however you wish.

All you need to do is create a 240×240 image and shoot it over to the device, so you’re free to come up with whatever sort of visuals you’d like. It even supports GIF if you’d like to work animation into it. The content can of course be whatever information you’re interested in showing, and it can be generated by whatever programming language or tool you’re most comfortable with. It’s a fascinating proof of concept, and now that the method has been demonstrated we’re interested to see where the community can take it.

If this all sounds a little too easy for your tastes, don’t worry. There’s a plenty deep rabbit hole you can dive into should you elect to replace the device’s firmware entirely.