Author: Zoe Skyforest

3645 Articles

App Detects Parkinsons Disease And COVID-19 Via Audio

November 28, 2022 by 20 Comments

One of the challenges of diagnosing diseases is identifying them early. At this stage, signs may be vague or confusing, or difficult to identify. Early diagnosis is often tied to the best possible treatment outcomes, so there’s plenty of incentives to improve methods in this way.

A new voice-based method of diagnosing disease could prove fruitful in this regard. It relies on machine learning techniques to detect when patients may be suffering from certain conditions.

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EV Chargers Could Be A Serious Target For Hackers

November 28, 2022 by 56 Comments

Computers! They’re in everything these days. Everything from thermostats to fridges and even window blinds are now on the Internet, and that makes them all ripe for hacking.

Electric vehicle chargers are becoming a part of regular life. They too are connected devices, and thus pose a security risk if not designed and maintained properly. As with so many other devices on the Internet of Things, the truth is anything but. 

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Spoofing LIDAR Could Blind Autonomous Vehicles To Obstacles

November 22, 2022 by 74 Comments

Humans manage to drive in an acceptable fashion using just two eyes and two ears to sense the world around them. Autonomous vehicles are kitted out with sensor packages altogether more complex. They typically rely on radar, lidar, ultrasonic sensors, or cameras all working in concert to detect the road conditions ahead.

While humans are pretty wily and difficult to fool, our robot driving friends are less robust. Some researchers are concerned that LiDAR sensors could be spoofed, hiding obstacles and tricking driverless cars into crashes, or worse.

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Real Minecraft Furnace Generates Electricity From Coal

November 18, 2022 by 22 Comments

There’s a furnace in Minecraft that is used to power all kinds of things in the game. [Joel] of Joel Creates decided he wanted to build a real-world replica, and did exactly that.

The furnace consists of a 30 cm aluminium cube, inside which the coal is burned. Thermoelectric generators (TEGs) are then placed on the sides of the furnace to turn the heat into useful electricity. The TEGs are installed in a sandwich of aluminium plates designed to maximize heat transfer through the TEGs themselves. They’re fitted with heatsinks to help create the maximum thermal gradient for greater power output. The entire setup is housed in a larger aluminium cube that’s finished to look like the Minecraft furnace — achieved by using a CNC machine to draw on the aluminium with high-temperature Sharpies.

With the coal a-burning inside, the furnace was able to generate enough power to run its own cooling and exhaust fans. It even had a little power left over to charge a phone. Overall though, [Joel] hopes that with some improvement, it can one day power his Minecraft car replica up to its top speed of 25 mph.

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Tiny RC Truck And Trailer Motors Around Tabletop

November 18, 2022 by 17 Comments

Most RC cars replicate real-world race cars or fantastical off-road buggies for outdoor escapades. [diorama111] is an expert at building tiny desk-roaming models, though, and built this exquisite micro semi-truck and trailer.

Based on a 1/150 scale truck and trailer model, the build starts with the tractor unit. It’s disassembled, and its plastic wheels are machined on a tiny lathe so they can be fitted with grippy rubber tires carved out of O-ring material. The front wheels are given hubs and mounted to a motor-driven screw-type steering assembly. A photodetector is used to aid in self-centering. The rear axle is fitted with a geared drivetrain, running off a small DC motor. Multiple gear stages are used to give the build plenty of torque for pulling the trailer. Remote control of the model is achieved over Bluetooth, with an ATtiny3217 tucked inside with motor drivers to run the show.

The microcontroller also runs a full set of driving, tail, and indicator lights. The trailer is fitted with an infrared receiver and a battery of its own. It receives signals from an infrared LED on the tractor unit, which tell the trailer when to turn on the taillights and indicators.

There aren’t too many modelers working in the RC space at the 1:150 scale. [diorama111] has form here, though, and we’ve featured a previous Toyota Crown build before.

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Building A LEGO Pneumatic Engine

November 17, 2022 by 6 Comments

Pneumatic engines aren’t something we use every day, but they’re compelling things to see working in practice. [Nico71] built an eye-catching example out of LEGO Technic, and it’s remarkably fully-featured.

The build relies on a single pneumatic cylinder driving a flywheel. Flow to the cylinder is determined by camshaft-controlled valves. The valves themselves are custom-built, composed of hose loops that are kinked to shut off flow. In addition to the basic operating components, the engine also features a throttle valve which uses the same kinked-hose principle. The main control valves are installed in a housing that can be rotated relative to the engine’s frame to vary the timing of the valves relative to the flywheel’s rotation. A gear system allows fine adjustment of the timing. The throttle and timing controls are accessible on a tidy control panel complete with a idle-adjust mechanism.

Those wishing to build one themselves can rejoice, for [Nico71] provides instructions for a small fee. We’ve seen other air engines before, too, often of the 3D-printed variety.

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Amphibious Dragster Drives On Water

November 17, 2022 by No comments

Dragsters are typically about peak performance on a tarmac drag strip. [Engineering After Hours] took a different tack, though, building a radio-controlled amphibious dragster intended to cross small bodies of water.

The build is based on a Traxxas Raptor RC car. However, it’s been heavily reworked from a pickup-like design to become a dragster with a motor mounted in the rear. It’s also been fitted with a foam underbody to allow it to float when stationary. The rear tires have been replaced with 3D-printed versions with large paddles, which provide propulsion in the water.

Initial tests showed the car struggled to make progress in the water, as the paddle tires tended to drag the rear end deeper under water. The tiny dragster tires up front didn’t help it steer, in water either. Large foam discs were added to the front tires to enable them to act as better rudders.

Fitted with its water tires and foam floatation aids, the car can only drive slowly on land, but [Engineering After Hours] points out this is enough to call it amphibious. It does a better job at skittering around on water, and it was able to cross a local pond at low speed.

We’ve seen some other creative techniques for making amphibious vehicles, like these crazy star-shaped wheels. Video after the break.

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