The Raspberry Pi RP2040 microcontroller is now available as a standalone chip, the RP2350, allowing manufacturers to integrate it into their own designs. This dual-core Cortex-M0+ processor with 264KB of SRAM is offered in two package variants: a QFN-56 and a future LGA package with stacked external flash memory. The QFN-56 is available for immediate purchase, offering a cost-effective solution for diverse embedded applications. The stacked memory variant promises simplified design and reduced board space, though pricing and availability for that package are yet to be announced.
This blog post details how to create a simple WAV file audio player using a Raspberry Pi Pico and a VS1053B audio decoder chip. The author outlines the hardware connections, provides the necessary MicroPython code, and explains the process of converting WAV files to a suitable format for the VS1053B using a provided Python script. The code initializes the SPI bus, sets up communication with the VS1053B, and then reads and sends the WAV file data to the decoder for playback. The project offers a straightforward method for adding audio capabilities to Pico projects.
Hacker News users discussed the practicality and limitations of the Raspberry Pi Pico as an audio player. Several commenters pointed out the Pico's limited storage, suggesting SD card solutions or alternative microcontrollers like the ESP32 with built-in flash. Others questioned the need for code to handle WAV file parsing, advocating for simpler PCM data streaming. Some users expressed interest in using the project for specific applications like playing short notification sounds or chiptune music. The discussion also touched upon the Pico's suitability for audio synthesis and the potential of the RP2040 chip.
The blog post "A vending machine, on the internet" explores the concept of building a virtual vending machine using readily available web technologies. It details the author's project, which combines a physical interface (buttons and a display) with a web backend to simulate a real-world vending machine experience. The project uses a Raspberry Pi to control the physical components and communicates with a web server to manage inventory, process transactions, and deliver virtual "goods" like access codes or digital downloads. The post highlights the simplicity and accessibility of building such a project with tools like HTML, CSS, JavaScript, and Python, showcasing a fun and practical application of web development beyond traditional websites.
Hacker News users generally expressed enthusiasm for the internet-connected vending machine project. Several praised the creator's ingenuity and the "whimsical" nature of the project. Some commenters discussed the technical aspects, focusing on the use of a Raspberry Pi and the potential vulnerabilities of exposing such a device to the internet. Others shared similar personal projects, like controlling Christmas lights remotely. A few raised concerns about security and the practicality of the setup, questioning the real-world use cases beyond a fun experiment. There was also a short discussion about the cost-effectiveness of the hardware choices.
Pi-hole v6.0 is a significant update focusing on enhanced user experience and maintainability. It features a redesigned web interface with improved navigation, accessibility, and dark mode support. Under the hood, the admin console now uses Vue 3 and the API utilizes PHP 8.1, modernizing the codebase for future development. FTL, the DNS engine, also received updates improving performance and security, including DNSSEC validation enhancements and optimized memory management. While this version brings no major new features, the focus is on refining the existing Pi-hole experience and laying the groundwork for future innovation.
Hacker News users generally expressed excitement about Pi-hole v6, praising its improved interface and easier setup, particularly for IPv6. Some users questioned the necessity of blocking ads at the DNS level, citing browser-based solutions and the potential for breakage of legitimate content. Others discussed alternative solutions like NextDNS, highlighting its cloud-based nature and advanced features, while some defended Pi-hole's local control and privacy benefits. A few users raised technical points, including discussions of DHCPv6 and unique privacy addresses. Some expressed concerns about the increasing complexity of Pi-hole, hoping it wouldn't become bloated with features. Finally, there was some debate about the ethics and effectiveness of ad blocking in general.
A hobbyist built a low-cost, DIY plane spotting system using a Raspberry Pi, a software-defined radio (SDR), and a homemade antenna. This setup receives ADS-B signals broadcast by aircraft, allowing him to track planes in real-time and display their information on a local map. The project, called "PiLane," leverages readily available and affordable components, making it accessible to other enthusiasts. The website details the build process, software used, and provides links to the project's source code.
HN commenters generally praised the project's ingenuity and execution. Several appreciated the detailed blog post explaining the hardware and software choices. Some questioned the legality of publicly sharing ADS-B data, particularly decoded Mode S messages containing identifying information. Others offered suggestions for improvement, including using a Raspberry Pi for lower power consumption, exploring different antenna designs, and contributing to existing open-source projects like ADSBexchange. The discussion also touched on data filtering techniques, the range of the system, and the possibility of integrating ML for aircraft identification. A few commenters shared their own experiences with similar projects and related technologies.
This guide provides a comprehensive introduction to BCPL programming on the Raspberry Pi. It covers setting up a BCPL environment, basic syntax and data types, control flow, procedures, and input/output operations. The guide also delves into more advanced topics like separate compilation, creating libraries, and interfacing with the operating system. It includes numerous examples and exercises, making it suitable for both beginners and those with prior programming experience looking to explore BCPL. The document emphasizes BCPL's simplicity and efficiency, particularly its suitability for low-level programming tasks on resource-constrained systems like the Raspberry Pi.
HN commenters expressed interest in BCPL due to its historical significance as a predecessor to C and its influence on Go. Some recalled using BCPL in the past, highlighting its simplicity and speed, and contrasting its design with C. A few users discussed specific aspects of the document, such as the choice of Raspberry Pi and the use of pre-built binaries, while others lamented the lack of easily accessible BCPL resources today. Several pointed out the educational value of the guide, particularly for understanding compiler construction and the evolution of programming languages. Overall, the comments reflected a mix of nostalgia, curiosity, and appreciation for BCPL's role in computing history.
Summary of Comments ( 16 )
https://news.ycombinator.com/item?id=43388221
Hacker News users generally expressed excitement about the RP2350's availability and potential, particularly its low cost and the possibilities opened by the stacked memory variant. Several commenters discussed the chip's suitability for specific applications, including robotics, industrial control, and amateur radio. Some expressed skepticism about the real-world performance impact of the stacked memory, wanting to see benchmarks. Others debated the merits of the RP2350 compared to other microcontrollers like the ESP32, highlighting trade-offs in processing power, memory, and peripheral options. A few users also mentioned challenges they've faced with Raspberry Pi availability in the past, hoping this release would be smoother.
The Hacker News comments section for the post "Raspberry Pi RP2350 Now Available for Purchase, Stacked Memory Variant Coming" contains several interesting discussions. Many commenters focus on the potential applications and implications of this new chip.
Several users express excitement about the RP2350's potential for embedded systems, particularly in industrial control and robotics. They highlight the chip's real-time capabilities and its ability to handle demanding tasks. Some anticipate it being a strong contender against existing industrial microcontrollers. The relatively low cost compared to other industrial-grade solutions is mentioned repeatedly as a major advantage.
A significant thread discusses the stacked memory variant and its benefits. Commenters anticipate that this will simplify designs and reduce board space, making it even more attractive for compact embedded systems. Some speculate about potential performance improvements from having the memory closer to the processor.
Another thread explores the availability and pricing of the RP2350. Some users express concern about potential supply chain issues, drawing parallels with the difficulties encountered with other Raspberry Pi products. Others discuss the different purchasing options and the potential markups from resellers.
A few comments delve into the technical specifications of the RP2350, comparing it to other microcontrollers and discussing the implications of its architecture. There's some discussion of the development tools available for the RP2350 and how easy it will be to integrate into existing projects.
Several commenters share their own project ideas and potential use cases for the RP2350, ranging from simple control systems to more complex robotic applications. This demonstrates the enthusiasm and creative potential within the community surrounding this new chip.
Finally, some users comment on the wider implications of the RP2350 for the microcontroller market. Some speculate that it could disrupt the existing landscape and put pressure on established players to lower their prices. Others predict a surge in innovation and new applications as developers explore the possibilities of this new platform.