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Open Hardware: Librem and Arduino Projects

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  • Librem 5 USA At Shipping Parity: New Orders Ship Within 10 Business Days – Purism

    For anyone who is new to the product, the Librem 5 USA is our premium phone that shares the same hardware design and features as our mass-produced Librem 5, but with electronics we make in the USA using a separate electronics supply chain that sources from US suppliers whenever possible. This results in a tighter, more secure supply chain for the Librem 5 USA. The Librem 5 USA uses the same PureOS as our other computers and so it runs the same desktop Linux applications you might be used to, just on a small screen. PureOS on the Librem 5 USA demonstrates real convergence, where the device becomes more than just a phone, it becomes a full-featured pocket-sized computer that can act like a desktop when connected to a monitor, keyboard and mouse, or even a laptop (or tablet!) when connected to a laptop docking station. All of your files and all of your software remains the same and follows you where you go. Applications just morph from the smaller screen to the larger screen when docked, just like connecting a external monitor to a laptop.

  • LEGO-firing turret targets tender tootsies | Arduino Blog

    Stepping on LEGO bricks is a meme for a reason: it really @#$%&! hurts. LEGO brick design is ingenious, but the engineers did not consider the ramifications of their minimalist construction system. We’ve seen people do crazy things for Internet points, such as walk across a bed of LEGO like they’re hot coals — or in Adam Beedle’s case, build a LEGO-firing turret specifically to shoot plastic bricks under a person’s feet.

    This project consists of two distinct sub-systems: the mechanical turret that launches the LEGO bricks and the targeting system that recognizes feet. For the former, Beedle devised a clever rubber band-based mechanism that cranks into position with a rack and pinion. An Arduino Uno rotates the pinion with a continuous-rotation servo motor. The pinion gear has a few teeth missing, so it releases the rubber bands and flings the loaded LEGO brick after a few rotations. Another brick then drops down from a hopper and the cycle repeats, resulting in automatic firing.

  • Reducing automotive fuel consumption with an Arduino | Arduino Blog

    Every car sold in the last few decades is equipped with an engine control unit, or ECU for short. Its job is to control nearly every aspect about the vehicle’s performance by reading various sensors and acting upon those inputs accordingly. However, some older rides aren’t nearly as performant as they could be, which is why YouTuber Robot Cantina wanted to modify their 1997 Saturn coupe for better fuel efficiency.

    To accomplish this goal, Robot Cantina created a lean burn system that works by making the ECU think the engine is burning more fuel than the actual amount, thus decreasing fuel consumption. They took a cheap air/fuel mixture sensor and connected its input to the engine’s manifold. Due to how it outputs a wideband, linear voltage, the signal had to be converted with an Arduino Uno into a narrow, lower voltage range via a lookup table.

  • Over-engineered robotic scalp scratcher knows all the moves | Arduino Blog

    Those cheap wire-arm head massagers are great at giving your scalp a nice, relaxing rub. But they’re handheld implements that force the user to either manipulate the massager themselves or talk a partner into performing the task. David McDaid decided that the experience would be much more pleasant if a robot took care of the hard work, so he built this Stewart platform head massager.

    A Stewart platform is a dexterous manipulator often used with robotic end effectors or for orienting equipment. The standard setup requires six linear actuators, each with universal joints on both ends. The actuators mount between two plates in an arrangement that gives the top plate six degrees of freedom (DoF): pitch, roll, yaw, and linear movement in each of the three spatial axes. A Stewart platform is perfect for this application, because it lets the robot move the head massager in a variety of different ways that mimic manual movement.

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  • Will the IndieWeb Ever Become Mainstream?

    This is an interesting question, thanks for asking it, Jeremy. I do have some history with the IndieWeb, and some opinions, so let’s dive in.

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  • How to Install CUPS Print Server on Ubuntu 22.04

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Open Hardware: XON/XOFF and Raspberry Pi Pico

  • From XON/XOFF to Forward Incremental Search

    In the olden days of computing, software flow control with control codes XON and XOFF was a necessary feature that dumb terminals needed to support. When a terminal received more data than it could display, there needed to be a way for the terminal to tell the remote host to pause sending more data. The control code 19 was chosen for this. The control code 17 was chosen to tell the remote host to resume transmission of data.

  • Raspberry Pi Pico Used in Plug and Play System Monitor | Tom's Hardware

    Dmytro Panin is at it again, creating a teeny system monitor for his MacBook from scratch with help from our favorite microcontroller, the Raspberry Pi Pico. This plug-and-play system monitor (opens in new tab) lets him keep a close eye on resource usage without having to close any windows or launch any third-party programs. The device is Pico-powered and plugs right into the MacBook to function. It has a display screen that showcases a custom GUI featuring four bar graphs that update in real-time to show the performance of different components, including the CPU, GPU, memory, and SSD usage. It makes it possible to see how hard your PC is running at a glance.

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