This article details a fascinating project where a researcher successfully used signals from the NISAR radar-imaging satellite to create a passive radar system. By utilizing the satellite's L-band chirp signal, reflected off the landscape, and comparing it to a direct signal, a topographical image could be generated. The setup involved using GNSS antennas and an SDR (Software Defined Radio) with a Raspberry Pi to record and process the signals. While not producing high-resolution images, the experiment successfully demonstrated the feasibility of using satellite signals for passive radar, even with relatively simple and inexpensive equipment.
This Hackaday article details a DIY passive radar system built to track aircraft by analyzing existing radio wave reflections. Unlike traditional radar, this system doesn't emit its own signal, instead relying on signals already present in the environment, specifically those used for ADS-B transmissions. The system uses a nine-element Yagi antenna to capture these reflections and a computer program to compare the direct and reflected signals, identifying aircraft.
This article explores the question of whether we've reached a point of diminishing returns in computing power. It notes historical mispredictions about computer demand and highlights the rapid increase in processing capabilities, comparing modern smartphones to 1980s supercomputers. The author discusses how software engineers will always utilize available resources and questions if the continued pursuit of ever-increasing compute power is truly beneficial. It suggests that for many personal projects, existing hardware is more than sufficient, and that the "enough" threshold is highly dependent on individual needs and tasks.
zclaw is a personal AI assistant running on an ESP32, backed by Anthropic, OpenAI, or OpenRouter. It allows for monitoring and control of connected devices via Telegram, scheduling tasks, and creating custom tools, all within an 888KB footprint.
This article details a project to create an atomic clock using a cheap wall clock movement, an ESP8266 processor, and an EERAM chip. The project involves gutting the clock movement, controlling the hands with pulses sent to the motor, synchronizing with an NTP server, and using EERAM to store the current time for accurate timekeeping even after power loss. The author also explores potential artistic applications beyond simply telling time.
Rafael Ben-Ari has created AI-generated newspapers, including a tech news feed and a retrocomputing paper based on SimCity 2000, using a suite of LLM agents for reporting and editing. This allows for highly niche publications tailored to specific interests.
This Hackaday article discusses the historical significance of the Atari 800 and 400 computers, released in 1979, and their impact on the early home computer market. It highlights how the Atari 800, with its music synthesizer, bit-mapped graphics, and sprites, compared favorably to competitors like the Apple II, Commodore PET, and TRS-80.
John McNelly developed ADSBee, an open source ADS-B receiver based around an RP2040, to decode aircraft monitoring signals. It supports both 1090 MHz ADS-B and 978 MHz UAT protocols and is available in various form factors.
Brow6el is a terminal web browser that uses sixel graphics to display a fully graphical web browser within a terminal. It renders webpages headless using the Chromium Embedded Framework and converts the output to sixels.
An article discussing the microphone found on the Sipeed NanoKVM, explaining it's presence due to the board being based on an existing development board and how it could be useful for troubleshooting.
