A Single Board Computer From A TV

November 14, 2022 by Jenny List 37 Comments

It is an annoyance for some members of our community, that it has become almost impossible to buy a TV that’s not a so-called “smart” TV. These units contain a computer as well as the display, and it boots into a locked-down OS with a user interface and a load of streaming apps. Can anything be done with them other than what their manufacturers intended? [Nina Kalinina] has managed it, taking the mainboard from a discarded LCD TV and liberating the ARM Linux board within.

On the board are all the inputs you’d expect from a TV, along with Ethernet, and a couple of extra USB ports hidden in the WiFi interface. There’s a UART available on the SCART connector, and accessing the U-boot menu is achieved by the unusual means of sending a character to the infrared port using a Palm Pilot. Surprisingly the device tree in the Flash was editable, so with the Linux OS accessed, the board was revealed as having a dual-core Novatek SoC.

This is reminiscent of the days when the new hotness was dragging a Linux box out of a home router, and just as those were quickly eclipsed by inexpensive boards such as the Raspberry Pi, so might these TV boards meet the same fate. If, however, they can be made to drive a screen with something more useful than the TV interface then that might change, as who wouldn’t want to make an old smart TV a bit more useful?

Pretty Petite Picolibc Powers Processors

November 14, 2022 by Al Williams 10 Comments

Many times when someone tells you that language X is “better” at something they really mean that it has better built-in libraries for that task. Java is a great example. The language isn’t all that different from C++ outside of garbage collection and multiple inheritance, but the standard libraries are super powerful, especially for networking. Even C relies on a library to provide a lot of functions people think of as part of the language — printf, for example. That’s not really part of the C language, but just part of the standard library. When you are writing for a tiny processor, the choice of library is critical and [Keith Packard] offers you one choice: picolibc.

The library has its genesis from two other diminutive libraries: Newlib and the AVR version of libc. It provides support for ARC, ARM, i386, m68k, MIPS, MSP430, Nios II, PPC, RISC-V, Sparc64, x86_64, and the ESP8266/ESP32.

Continue reading “Pretty Petite Picolibc Powers Processors” →

A Commodore SX-64 showing a six-digit code and a countdown timer

Generating Two-Factor Authentication Codes With A Commodore 64

November 14, 2022 by Robin Kearey 15 Comments

If you’ve used a corporate VPN or an online-banking system in the past fifteen years or so, chances are you’ve got a few of those little authenticator key fobs lying around, still displaying a new code every 30 seconds. Today such one-time codes are typically sent to you by text message or generated by a dedicated smartphone app, which is convenient but a bit boring. If you miss having a dedicated piece of hardware for your login codes, then we’ve got good news for you: [Cameron Kaiser] has managed to turn a Commodore SX-64 into a two-factor authenticator. Unlike a key fob that’s one gadget you’re not likely to lose, and any thief would probably need to spend quite some time figuring out how to operate it. Continue reading “Generating Two-Factor Authentication Codes With A Commodore 64” →

LEGO Race Car Simulator Is Like A Mechanical Arcade Game

November 14, 2022 by Lewin Day 6 Comments

We’ve all played some variant of that simple old racing video game. It’s the one that involves swerving around cars in front without crashing, as the pace steadily increases further. [Dr. Engine] has recreated that very game in the physical world, with the help of LEGO Technic.

The design uses what appears to be a LEGO tank tread to create a treadmill for a LEGO car. The initial design is hand-cranked, but [Dr. Engine] soon upgrades this with a motor. The wide treadmill is then fitted with a steering wheel. This steers the car laterally along the treadmill via a simple pulley system. From there, it was a simple job of adding gearbox to change the speed of the treadmill, and obstacles for the car to dodge. Double-sided table affixed small die-cast cars to the track to fit the theme of the build.

It’s great fun watching the car buck and weave over the undulating track, and we’d certainly love to compete with friends for the high score. We’ve seen similar builds before, too, like this all-LEGO suspension dyno. Video after the break.

Continue reading “LEGO Race Car Simulator Is Like A Mechanical Arcade Game” →

Automatic Lens Cover Helps Cameras Cover Space Launches

November 14, 2022 by Lewin Day 14 Comments

Shooting space launches often requires the use of remote cameras for safety reasons. However, that means there’s no photographer on hand to wipe lenses down if they happen to get condensation from the prevailing weather conditions. [Michael Baylor] was having issues with atmospheric moisture interfering with his launch shots, so built a custom automatic lens cap to help solve the issue.

The design is simple, consisting of a large shutter that pivots to cover the camera lens when photos aren’t being taken, controlled by an impressively-beefy servo. Not only does the automatic cap protect the lens from condensation prior to the moment of launch, it also closes to cover the lens as the rocket leaves the frame. This protects the lens from all the dust and debris flying its way, kicked up by the rocket exhaust on takeoff.

[Michael] found that the lens cap easily outperformed his usual anti-condensation solution. While his camera with the auto-cap shot mostly-clean pics, another camera fitted with 18-hour handwarmers suffered significantly from condensation. The plan is to add just a little heat to the auto-cap setup to stave off condensation for good, even when shooting at pads like Vandenburg, California.

Details on the build are slim, but the basic concept is all there. Throw together a servo with some 3D-printed components and a microcontroller and you can build a setup custom-tailored to your own rig and use case. If you find yourself needing a capable long-range camera remote, too, we’ve seen those before as well! Video after the break.

Continue reading “Automatic Lens Cover Helps Cameras Cover Space Launches” →

ColecoVision Barn Find Gets Wireless Makeover

November 14, 2022 by Robin Kearey No comments

Few things are more satisfying than finding an old, forgotten piece of technology somewhere and bringing it back to life. And while it’s great to see a rare sports car or an Apollo Flight Computer being restored, even not-very-successful game consoles from the 1980s can make for some great repair stories. Just look at how [Discreet Mayor] describes his restoration and modification efforts on a ColecoVision that he literally found in a barn.

Given that the ColecoVision was on the market between 1982 and 1985, we can assume that [Discreet Mayor]’s console had been sitting on a shelf for at least three decades, and the machine was definitely showing its age. Several components had failed due to corrosion, including the clock crystal, a 7400 series logic chip and a capacitor in the power supply, but since these are all standard components it was rather straightforward to replace them.

The controllers however were sadly beyond repair. Replacing them with standard joysticks wasn’t really an option because the ColecoVision controllers included a numeric keypad, which was mainly used to select game options. Making something completely new was the way to go, and [Discreet Mayor] decided to go for a wireless system while he was at it. After all, he had already developed a modular wireless IoT system based on the IEEE 802.15.4 standard, which turned out to be a perfect fit for this system.

[Discreet Mayor] built a simple joystick-plus-fire-button setup on a piece of MDF and equipped it with his IoT transmitter. Instead of adding a replacement numeric keypad he decided to use the joystick to simulate the most commonly-used buttons: “right” for “1”, “down” for “2” and so on. The receiver module uses digital switches to mimic keypresses to the console’s input port. The end result might look a bit hacky, but the console is fully functional again and runs its games just like it did over thirty years ago.

We’ve seen several projects that add wireless controllers to a variety of classic consoles. If you’ve got a ColecoVision that turns out to be beyond salvaging, you can always just build your own from scratch.

On Getting A Computer’s Attention And Striking Up A Conversation

November 14, 2022 by Maya Posch 17 Comments

With the rise in voice-driven virtual assistants over the years, the sight of people talking to various electrical devices in public and in private has become rather commonplace. While such voice-driven interfaces are decidedly useful for a range of situations, they also come with complications. One of these are the trigger phrases or wake words that voice assistants listen to when in standby. Much like in Star Trek, where uttering ‘Computer’ would get the computer’s attention, so do we have our ‘Siri’, ‘Cortana’ and a range of custom trigger phrases that enable the voice interface.

Unlike in Star Trek, however, our virtual assistants do not know when we really desire to interact. Unable to distinguish context, they’ll happily respond to someone on TV mentioning their trigger phrase. This possibly followed by a ludicrous purchase order or other mischief. The realization here is the complexity of voice-based interfaces, while still lacking any sense of self-awareness or intelligence.

Another issue is that the process of voice recognition itself is very resource-intensive, which limits the amount of processing that can be performed on the local device. This usually leads to the voice assistants like Siri, Alexa, Cortana and others processing recorded voices in a data center, with obvious privacy implications.

Continue reading “On Getting A Computer’s Attention And Striking Up A Conversation” →