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.
GitSyncPad is a small, programmable keypad designed to streamline common Git actions. By pressing dedicated keys, users can perform tasks like adding files, committing changes, pushing to remote repositories, and pulling updates, eliminating the need for typing commands in the terminal. It's customizable, allowing users to configure key mappings for their specific workflows and integrate with various Git providers like GitHub, GitLab, and Bitbucket. The device connects via USB and aims to increase efficiency for developers who frequently interact with Git.
HN commenters generally express skepticism about the GitSyncPad's practicality. Some question the value proposition of a dedicated physical device for common Git commands, arguing that keyboard shortcuts and shell scripts are faster and more flexible. Concerns are raised about context switching and the limited functionality offered compared to a full terminal. A few express mild interest, particularly for educational or accessibility purposes, but overall the response is lukewarm, with many suggesting that the project seems like a solution in search of a problem. One commenter points out a similar existing project called Git remote.
The author describes creating a DNS sinkhole using an ESP32 microcontroller to combat doomscrolling. By intercepting DNS requests on their local network and redirecting specific domains (like social media sites) to a local web server, they effectively block access to these sites. The ESP32 runs a custom DNS server that returns a pre-defined IP address for targeted domains, leading devices to a blank webpage hosted on the ESP32 itself. This allows the author to curtail time spent on distracting websites without relying on browser extensions or more complex network configurations.
Hacker News users generally praised the project's simplicity and effectiveness for blocking distracting websites. Several commenters suggested improvements, such as using a pre-built DNS sinkhole list or implementing a local DNS server for better performance. Some discussed the ethics and potential downsides of blocking websites, particularly for families or in situations where access is necessary. Others offered alternative solutions, like using Pi-hole or modifying the hosts file. A few pointed out potential issues with the ESP32's limited resources and the importance of using a reliable power supply. The overall sentiment was positive, viewing the project as a clever, albeit somewhat limited, solution to a common problem.
This post details how to access the Qualcomm Quectel BG96 modem embedded within the RAK5010 WisBlock Core module via USB. The BG96 exposes multiple serial ports over USB, but only one is typically configured for user interaction. The post explains how to use minicom to interact with the modem on its default port and outlines the process of switching to other ports, specifically the diagnostic port, using AT commands. This access allows for deeper interaction with the modem, enabling activities like firmware updates and more granular control, which are not possible through the default port. The author emphasizes the importance of switching back to the default port after completing tasks on the diagnostic port to restore normal functionality.
Several commenters on Hacker News discussed practical aspects of using the RAK5010 and similar devices. Some questioned the practicality of USB tethering for IoT applications, citing power consumption concerns and suggesting alternative solutions like direct TCP/IP connections over cellular. Others shared personal experiences and insights, including one commenter who detailed their success using the RAK7200 with a Quectel modem and another who noted the complexities and lack of clear documentation around AT command interactions for specific modem features. A few comments also touched upon the security implications of exposing the modem via USB, particularly in commercial deployments. The overall sentiment reflected interest in the technical details but also a pragmatic awareness of the challenges involved in this approach.
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.
Espargos is an open-source project developing a modular, expandable, and affordable WiFi sensing array based on ESP32 microcontrollers. Each node in the array passively monitors surrounding WiFi signals, and through techniques like Channel State Information (CSI) analysis, can detect subtle changes in the environment. These changes can then be interpreted for various applications like gesture recognition, presence detection, and even material identification. The project emphasizes ease of use and customization, allowing users to build arrays of varying sizes and configurations tailored to specific needs. The software platform provides tools for data collection, processing, and visualization, enabling experimentation and development of novel sensing applications using the collected WiFi data.
Hacker News users discussed the Espargos project, primarily focusing on its potential applications and limitations. Some saw promise in using it for security, like detecting intruders or monitoring elderly relatives, while others suggested applications in smart home automation or scientific research like analyzing crowd movement. Concerns were raised regarding privacy implications, the practicality of calibration, and the limited range of the ESP32's WiFi sensing. The reliance on signal strength as the primary metric was also questioned, with some suggesting incorporating time-of-flight measurements for improved accuracy. A few commenters expressed interest in the project's open-source nature and potential for customization. There was some debate on the best use cases, with some arguing its value lay more in research and experimentation than in robust, real-world applications.
The Flea-Scope is a low-cost, open-source USB oscilloscope, logic analyzer, and arbitrary waveform generator. Designed with affordability and accessibility in mind, it utilizes a Cypress FX2LP microcontroller and features a minimalist design detailed in a comprehensive, publicly available PDF. The document covers hardware schematics, firmware, software, and usage instructions, enabling users to build, modify, and understand the device completely. The Flea-Scope aims to be a practical tool for hobbyists, students, and professionals seeking a basic, yet versatile electronic test instrument.
Commenters on Hacker News generally praised the Flea-Scope for its affordability and open-source nature, finding it a compelling option for hobbyists and those needing a basic tool. Several pointed out its limitations compared to professional equipment, particularly regarding bandwidth and sample rate. Some discussed potential improvements, including using a faster microcontroller and enhancing the software. The project's use of a Cypress FX2 chip was highlighted, with some expressing nostalgia for it. A few users shared personal experiences using similar DIY oscilloscopes, and others questioned the practicality of its low bandwidth for certain applications. The overall sentiment was positive, viewing the Flea-Scope as a valuable educational tool and a testament to what can be achieved with limited resources.
Motivated by the lack of a suitable smartwatch solution for managing his son's Type 1 diabetes, a father embarked on building a custom smartwatch from scratch. Using off-the-shelf hardware components like a PineTime smartwatch and a Nightscout-compatible continuous glucose monitor (CGM), he developed software to display real-time blood glucose data directly on the watch face. This DIY project aimed to provide a discreet and readily accessible way for his son to monitor his blood sugar levels, addressing concerns like bulky existing solutions and social stigma associated with medical devices. The resulting smartwatch displays glucose levels, trend arrows, and alerts for high or low readings, offering a more user-friendly and age-appropriate interface than traditional diabetes management tools.
Hacker News commenters largely praised the author's dedication and ingenuity in creating a smartwatch for his son with Type 1 diabetes. Several expressed admiration for his willingness to dive into hardware and software development to address a specific need. Some discussed the challenges of closed-loop systems and the potential benefits and risks of DIY medical devices. A few commenters with diabetes shared their personal experiences and offered suggestions for improvement, such as incorporating existing open-source projects or considering different hardware platforms. Others raised concerns about the regulatory hurdles and safety implications of using a homemade device for managing a serious medical condition. There was also some discussion about the potential for commercializing the project.
Hannah Ilea built a physical rendition of Steve Reich's "Clapping Music" using two flip-disc displays. These displays, commonly found in old train station departure boards, create a visual and auditory representation of the piece. One display plays a steady, repeating 12-beat pattern while the other shifts by one beat after every 12 cycles. The clicking sounds of the flipping discs, combined with the visual pattern changes, mimic the rhythmic structure of the original composition. The project showcases a unique intersection of music, visual art, and vintage technology.
HN commenters generally enjoyed the project, praising the creator's ingenuity and the pleasing visual/auditory result. Several noted the clever use of readily available hardware and appreciated the clear explanation of the build process. Some discussed the potential for extending the project, suggesting using more complex rhythms or different types of displays. One commenter linked to a similar project using split-flap displays, while another pointed out the similarity to a "flip clock" art piece they had encountered. A few users expressed interest in the code and hardware specifics, leading to a brief discussion of microcontroller choices and potential improvements to the driving circuitry.
Summary of Comments ( 14 )
https://news.ycombinator.com/item?id=43230821
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 Hacker News post titled "Raspberry Pi Pico audio player" (linking to http://lucstechblog.blogspot.com/2025/02/raspberry-pi-pico-audio-player.html) has several comments discussing various aspects of the project and its potential.
One commenter points out the interesting choice of using a DAC for audio output, contrasting it with the more common PWM (Pulse Width Modulation) approach typically used with the RP2040 microcontroller found on the Pico. They express curiosity about the reasoning behind this decision, speculating about potential advantages in terms of audio quality or resource usage. The commenter also raises the question of whether using the DMA (Direct Memory Access) controller alongside the DAC might free up the CPU for other tasks, which could be beneficial for more complex projects.
Another commenter focuses on the user interface aspect, suggesting improvements to the described button-based control system. They propose using a rotary encoder instead of individual buttons, highlighting its more intuitive and user-friendly nature for tasks like volume adjustment and track selection. This suggestion reflects a focus on enhancing the overall user experience of the audio player.
Further discussion delves into the technical details of audio playback on microcontrollers. One comment mentions the RP2040's PIO (Programmable Input/Output) state machines as a potential alternative for audio output, comparing its capabilities to the DAC and PWM methods. This introduces a more advanced technical perspective, suggesting that different hardware resources within the RP2040 can be leveraged for audio generation depending on the specific requirements of the project.
The practicality of the project is also questioned, with one commenter expressing skepticism about using a microcontroller-based system for playing larger audio files due to limited storage capacity. They suggest that streaming audio from a separate device might be a more realistic approach for extensive music libraries. This comment brings up the limitations inherent in using a resource-constrained device like the Raspberry Pi Pico for certain applications.
Finally, a comment praises the project's simplicity and accessibility, noting the clear and concise nature of the blog post and its potential to inspire others to explore similar projects. This highlights the educational value of the project and its contribution to the maker community.