A Custom Outdoor Cooking Station For City Life

July 11, 2022 by Dave Rowntree 13 Comments

[shoobs] relocated from Australia to Luxembourg, and was really missing the whole outdoor cooking scene that is apparently very common in those parts. Now living in a modest apartment building in the city, he had no easy way to recreate some of his favorite cooking methods — specifically that of Wok Hei (breath of a wok) — the art of Cantonese stir-frying which uses searing heat and a lot of flinging around of the food to mix it up with the burning oil. This results in a complex set of reactions utilizing smoking, caramelization, and Maillard reactions to produce the classic Cantonese smoky flavor. Not wanting an off-the-shelf solution [shoobs] took it on himself to build a balcony cooking station capable of the temperatures needed for Wok Hei, and documented it for our viewing pleasure.

Nice custom laser cut details on the regulator mounting

The build started with sourcing a free-standing burner unit from Alibaba, which proved to be a little less powerful (at 30 kW) than ideal, but still sufficient. After locating a matching regulator and pressure gauge capable of the needed flow rate to feed the hungry burner, the next task was to construct a sturdy enough bench to mount it all. This was constructed from Douglas fir slabs, butt-jointed using a 3D printed drilling jig for ease of construction.

Using a flatbed scanner, the existing burner base was digitized in order to make a model suitable for laser-cutting a new mounting plate from steel. [Shoobs] isn’t lucky enough to have access to a metal-capable laser cutter — he sent his cad files off to a cutting service.

A second plate was mounted below with a sufficient gap above the bench to act as a heat shield. This keeps the wooden worktop safe from the heat. Whilst he was laser cutting steel, [shoobs] took the opportunity to design a few other custom parts to mount the regulator and other bits, because, why wouldn’t you? We reckon the end result is pretty nice, in a minimalist and understated way.

We’re no strangers to neat cooking hacks ’round these parts, here’s a nice double-sausage burner for those emergency situations and if you need a custom BBQ burner, then look no further.

Automate The Freight: The Convenience Store That Comes To Your Door

June 20, 2022 by Dan Maloney 45 Comments

For as popular as they became during the COVID-19 lockdowns, grocery delivery services like InstaCart rely on a basic assumption to work: that customers know exactly what they want when they order. Once that hurdle is overcome, the transaction is simple — the driver accepts the job, drives to the store to pick up the order, and takes it to the customer. It requires the use of a fair amount of technology to coordinate everything, but by and large it works, and customers are generally willing to pay for the convenience.

But what if you could cut out that step where the driver goes to pick up your order? What if instead of paying someone to pick and pack your order and bring it to your front step, you just ordered up the whole store instead? That’s the idea behind Robomart, which seeks to deploy a fleet of mobile stores for when the convenience store isn’t quite convenient enough. And the way the company is choosing to roll out its service, not to mention the business model itself, may hold key lessons for other delivery automation platforms.

Continue reading “Automate The Freight: The Convenience Store That Comes To Your Door” →

Revolving Doors Aren’t Just Annoying, They’re Energy Saving Too

June 9, 2022 by Lewin Day 43 Comments

While most of us have been content with swing and sliding doors for the vast majority of our needs around the home, the revolving door remains popular in a wide variety of contexts.

It’s a confounding contraption that always feels ready to snatch and ensnare the unwary user. However, these doors do have certain benefits that have allowed them to retain popularity in many public buildings around the world. Let’s dive in to why below.

Continue reading “Revolving Doors Aren’t Just Annoying, They’re Energy Saving Too” →

3D Printed Protection Against “Under-Door” Attacks

June 2, 2022 by Donald Papp 44 Comments

“Under-door” style attacks are when an attacker slides a tool through the gap underneath a door, hooks the interior handle from below, and opens the door by pulling the handle downward. This kind of attack works on the sort of doors and locks commonly found in hotels, where turning the handle from the inside always results in an open door. [Michal Jirků] found himself in a hotel room with a particularly large gap underneath the door, and decided to quickly design and print a door guard to protect against just such an attack.

It’s a simple object, and twenty minutes of printing and a little double-sided tape is all it takes to deploy. Because an attacker performs an under-door attack with a sizable mechanical disadvantage, it doesn’t take much to frustrate the attempt, and that’s exactly what the object does. Physical security in hotels is especially important, after all, and crooks have been known to exploit known flaws like the face-palmingly bad Onity key card lock exploit.

If you’re having trouble picturing how it all works, this video demonstrates an under-door attack in action, so you can see how blocking the space by the handle would easily prevent the tool from getting where it needs to go.

2022 Sci-Fi Contest: A Very Star Wars Door

April 22, 2022 by Lewin Day No comments

Every fan of the original Star Wars trilogy knows the plight of Han Solo, who was so cruelly frozen in carbonite by Imperial forces. [erv.plecter] came into possession of a replica Solo, this time frozen in polyurethane, and set about using it as the door for a home theater setup.

Just like in the movie, there are a series of controls and lights on the side of the door, clearly intended to represent the state of the carbonite block and the smuggler trapped within. This was achieved with the use of a SAMD51 microcontroller, which controls five meters of WS2812B LED strip along with a small OLED display.

There’s also an amazing little smoke effect, built using a vape inhaler. These devices have proved popular for all kinds of theme builds and costumes, as it turns out. They’re a great way to produce a visible fog or smoke in a tiny, compact package.

[erv.plecter] was kind enough to share plenty of details on the build, including how the polyurethane cast was assembled into the door. The final result looks remarkably authentic, and would surely prove a hit at any Star Wars movie night. Just don’t spoil things by forcing everyone to sit through Revenge of the Sith. Video after the break. Continue reading “2022 Sci-Fi Contest: A Very Star Wars Door” →

Tech In Plain Sight: Car Doors

March 24, 2022 by Al Williams 54 Comments

There are a lot of common phrases that no longer mean what they used to. For example, you may have used the term “turn on the lights.” What are you actually turning? Where does this come from? Old gas lights had a valve that you did physically turn, and the phrase simply stuck around. Kids of the 90s have no idea why they “dial” a phone number. What about “roll up the car window”? You don’t often encounter old-fashioned car doors with manual locks or a crank to roll up the window. These days it is all electronic. But have you ever wondered what’s going on inside there?

Let’s take a look at car doors, how they keep you safe, and how that sheet of glass slides into place, sealing against wind, rain, and noise. Of course, there are fancy car doors like suicide doors or sexy-but-impractical gull wing doors. At least one concept car even has a door that disappears under the vehicle when it opens; check out the video below. But even garden-variety doors are marvels of mechanical engineering. A compact structure that is secure and — mostly — reliable. Let’s look at how they do that.

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Sensor Playground Keeps Track Of Indoor Air Quality Through The Cloud

March 19, 2022 by Robin Kearey 8 Comments

When [tdw] wasn’t feeling well one day, his wife suggested that it might be due to poor air quality in their home. While an ordinary person could have simply opened a window after hearing such an idea, [tdw] instead showed his true hacker spirit and set about measuring the indoor air quality. He began by designing a simple PCB to measure CO2 and volatile organic compound (VOC) levels, but eventually broadened his scope to end up with the Sensor Playground: a plug-and-play platform to read out various sensors and store the results in the cloud.

Deliberately designed to be easy to assemble with minimal soldering skills, the Sensor Playground consists of a big two-layer PCB onto which various modules can be plugged. It supports either an ESP32 DevKit or an Adafruit Feather module to provide processing power, and provides sockets for a bunch of sensors, conveniently wired with power and SPI or I2C. It also provides a rotary encoder and two buttons for user input. All source files are available on [tdw]’s GitHub page, ready to be applied to any kind of sensing task.

[tdw] set up his Sensor Playground with sensors measuring CO2, VOC, PM2.5 (particulate matter), as well as temperature and relative humidity. A web interface allows anyone to track these measurements in real-time. The open and modular design should make it easy to extend this system with various other sensor types: we can imagine that things like solar irradiation, outside temperature and wind speed would also add useful data to the mix. Perhaps even a Geiger counter to keep track of radiation levels?

As indoor air quality sensors go, this one is definitely comprehensive and easy to use. We’ve featured other air quality sensors before, some of which also link their data to the cloud.