Author: Lewin Day

3367 Articles

Smart Temp Sensors Helps You Nail Your Cooking

July 4, 2025 by 21 Comments

Cooking is all about temperature control: too cold isn’t good enough, and too hot can ruin everything. To aid in this regard, [Printerforge] created a smart temperature alarm to keep them aware of exactly what’s going on in the pot.

The device is simple — it uses an Arduino Nano hooked up to a thermistor to measure the temperature of fluid in a pot. The microcontroller displays the current temperature and the target temperature on a simple 16×2 character LCD. Upon the fluid reaching the target temperature, the alarm is sounded, indicating that the cooking has reached a given stage or must otherwise be seen to. The whole build is wrapped up in a simple 3D printed case, along with a lithium-ion cell with charging managed via a TP4056 module.

If you’re regularly letting your pasta overcook or your stews burn in the pot, this kind of tool could be useful for you. Similarly, if you’ve ever wanted to pursue the 64-degree egg, this could be a way to do it.  The trick is to make sure you build it safely—ensuring that any parts that come into contact with the food are rated as food safe for your given application.

If this build has you contemplating the possibilities of machine-assisted cooking, you might like to go even further. How about getting involved in the world of sous vide? Meanwhile, if you’ve got any kitchen hacks of your own, don’t hesitate to let us know on the tipsline!

Pez Blaster Shoots Candy Dangerously Fast

July 3, 2025 by 3 Comments

You could use a little pocket-sized Pez dispenser if you’re a humble, reserved person. Or, you could follow the example of [Backhaul Studios], and build a dangerously powerful blaster that shoots Pez fast enough to shatter them into pieces. Just don’t aim it at your own mouth.

As the video explains, Pez is really the perfect candy for this application. It’s compact, hard, and already designed to be dispensed via a magazine. It’s thus not a big stretch to set it up to be fired out of a pistol-like blaster. The build is of the flywheel type, where a pair of counter-rotating wheels fling the candy out at great speed. The wheels themselves are spun up to high speed with a pair of small brushless motors, running off hobby speed controllers and lithium-ion batteries. A simple trigger mechanism dispenses the rectangular candies into the wheel mechanism, sending them flying out of the blaster at will. It’s all 3D-printed, designed specifically for the purpose of high-speed candy delivery.

The video goes into great detail on the design, from the development of the TPU treads on the flywheels and other details that helped improve the effectiveness of the design. The final build shoots Pez fast enough that they practically detonate upon hitting a surface.

We’ve featured some innovative work in this space from [Backhaul Studios] before—the condiment cannon was really quite something. Video after the break.

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Smart Mjolnir Makes Questionable Judgement Call On Your Worthiness

July 3, 2025 by 3 Comments

Mjolnir, also known as Thor’s hammer, is a discerning thing, at least if you believe the modern Marvel canon. [alemanjir] decided to build a semi-functional replica that makes judgement calls of its own, though they’re perhaps a little less thought-out than the storied hammer of legend.

The build consists of a 3D-printed hammer prop, inside of which is a Raspberry Pi Pico microcontroller running the show. It’s hooked up to a MPR121 touch sensor that detects when someone grips the handle of the hammer. At this point, the Pico makes a pseudorandom “worthiness check” as to whether the holder is righteous enough to wield the hammer. If they are pure of heart, it unlocks a magnet which frees the hammer from whatever metallic surface it might be stuck to. [alemanjir] also included a little additional functionality, with the hammer playing various sounds when swung thanks to a speaker and a ADXL345 accelerometer secreted inside.

One wonders whether the electromagnet inside is strong enough to hold out against an unworthy person lifting it from the ground. While it’s perhaps not as powerful or as decisive as the mythical object, it’s nonetheless a fun learning project that likely taught [alemanja] some useful basics of embedded development.

We’ve featured some terrifying takes of the Mjolnir prop before, too, like this shockingly high voltage version. Video after the break.

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OpenMIDIStomper Makes Sure Your Gear Does What Your Foot Says

July 3, 2025 by 1 Comment

If you’re a solo musician, you probably have lots of gear you’d like to control, but you don’t have enough hands. You can enlist your feet, but your gear might not have foot-suitable interfaces as standard. For situations like these, [Nerd Musician] created the OpenMIDIStomper.

The concept is simple enough—the hardy Hammond enclosure contains a bunch of foot switches and ports for external expression pedals. These are all read by an Arduino Pro Micro, which is responsible for turning these inputs into distinct MIDI outputs to control outboard gear or software. It handles this via MIDI over USB. The MIDI commands sent for each button can be configured via a webpage. Once you’ve defined all the messages you want to send, you can export your configuration from the webpage by cutting and pasting it into the Arduino IDE and flashing it to the device itself.

We’ve featured some great MIDI controllers over the years, like this impressive parts bin build.

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Smallest Gaming Mouse Has Crazy Fast Polling Rate And Resolution

July 2, 2025 by 11 Comments

[juskim] wanted to build a tiny mouse, but it couldn’t just be any mouse. It had to be a high-tech gaming mouse that could compete with the best on raw performance. The results are impressive, even if the final build is perhaps less than ideal for pro-level gameplay.

The build riffs on an earlier build from [juskim] that used little more than a PCB and a 3D-printed housing to make a barebones skeleton mouse. However, this one ups the sophistication level. At the heart of the build is the nRF54L15 microcontroller, which is paired with a PAW3395 mouse sensor which is commonly used in high-end gaming mice. It offers resolution up to 26K DPI for accurate tracking, speeds up to 650 ips, and 8 kHz sampling rates. Long story short, if you want fine twitch control, this is the sensor you’re looking for. The sensor and microcontroller are laced together on a custom PCB with a couple of buttons, a battery, and a charging circuit, and installed in a barebones 3D-printed housing to make the final build as small as possible.

The only real thing letting the design down is the mouse’s key feature—the size. There’s very little body to grab on to and it’s hard to imagine being able to play most fast-paced games at a high level with such a tiny device. Nevertheless, the specs are hardcore and capable, even if the enclosure isn’t.

[juskim] loves building tiny peripherals; we’ve featured his fine work before, too. Video after the break.

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South Korea Brought High-Rise Fire Escape Solutions To The Masses

July 2, 2025 by 44 Comments

When a fire breaks out in a high-rise building, conventional wisdom is that stairwells are the only way out. Lifts are verboten in such scenarios, while sheer height typically prevents any other viable route of egress from tall modern buildings. If the stairs are impassable, or you can’t reach them, you’re in dire peril.

In South Korea, though, there’s another option for escape. The answer involves strapping on a harness and descending down ropes hanging off the side of the building, just like in an action movie. It might sound terrifying, but these descending lifeline devices have become a common part of fire safety infrastructure across the country.

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Why The Latest Linux Kernel Won’t Run On Your 486 And 586 Anymore

July 2, 2025 by 107 Comments

Some time ago, Linus Torvalds made a throwaway comment that sent ripples through the Linux world. Was it perhaps time to abandon support for the now-ancient Intel 486? Developers had already abandoned the 386 in 2012, and Torvalds openly mused if the time was right to make further cuts for the benefit of modernity.

It would take three long years, but that eventuality finally came to pass. As of version 6.15, the Linux kernel will no longer support chips running the 80486 architecture, along with a gaggle of early “586” chips as well. It’s all down to some housekeeping and precise technical changes that will make the new code inoperable with the machines of the past.

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