The best Hacker News stories from Show from the past day
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Show HN: Homemade rocketship treehouse – hardware to custom OS
(This was previously submitted as <a href="https://news.ycombinator.com/item?id=2246856" rel="nofollow">https://news.ycombinator.com/item?id=2246856</a>)<p>The Ravenna Ultra-Low-Altitude Vehicle is a backyard rocketship treehouse nestled in the Seattle neighborhood of Ravenna. Click the link to see a demo video (<a href="http://rocket.jonh.net" rel="nofollow">http://rocket.jonh.net</a>).<p>The hexagonal treehouse is about 6.5 feet (2 meters) across at its widest point. The frame is welded mild steel with riveted aluminum siding. It contains nearly 800 LEDs forming dozens of numeric displays spread across 14 control panels, each with an acrylic face laser-cut and etched with labels such as "Lunar Distance" and "Hydraulic Pressure". The pilot controls the rocket using a joystick and panels full of working switches, knobs and buttons. Underneath the capsule are three "thrusters" that shoot plumes of water and compressed air under the control of the pilot's joystick, simulating real positioning thrusters. Takeoff and docking sequences are augmented by a paint-shaker that simulates the vibration of a rocket engine. Sound effects complete the illusion, with a powered subwoofer that gives the rocket a satisfying rumble.<p>When it was built in 2011, rocket operations were controlled by three Atmega328 microprocessors on custom-fabricated printed circuit boards, running a small operating system, RULOS, built just for this project. A trench running from the house to the rocket carries 12VDC power for the lighting and electronics, water for the thrusters, compressed air, and several data signals.<p>Since 2011, the two-person team has upgraded it, here is a recent update from the makers:<p>One of the most visible changes is replacing the primary 4-line display with a slicker 6-line display (i.e., 6 rows of 8 columns of 7-segment LEDs). The audio synthesizer has been upgraded to a PCB that can generate 50khz, 16-bit audio. The interconnection bus, which had been flat IDC cable carrying individual on/off lines, was upgraded to a true I2C-based networked distributed system with over a dozen individually addressable targets, all interconnected by standard cat5 cable that carries both our I2C protocol and power. We also moved much of the electronics from 8-bit atmega328s to newer, 32-bit STM32F3's. RULOS has been expanded into a pretty general purpose embedded systems platform ported to 5 major lines of CPU (atmega, attiny, stm32, nxp lpc, and esp32). We've used it for dozens of other projects in the last 12 years, including a nanosecond-accurate timestamper, a GPS datalogger, an air quality sensor, various little electronic control boards for toys (e.g. these, and this), and an autonomous boat (that sank). It is all available on Github: <a href="https://github.com/jelson/rulos">https://github.com/jelson/rulos</a>.
Show HN: Homemade rocketship treehouse – hardware to custom OS
(This was previously submitted as <a href="https://news.ycombinator.com/item?id=2246856" rel="nofollow">https://news.ycombinator.com/item?id=2246856</a>)<p>The Ravenna Ultra-Low-Altitude Vehicle is a backyard rocketship treehouse nestled in the Seattle neighborhood of Ravenna. Click the link to see a demo video (<a href="http://rocket.jonh.net" rel="nofollow">http://rocket.jonh.net</a>).<p>The hexagonal treehouse is about 6.5 feet (2 meters) across at its widest point. The frame is welded mild steel with riveted aluminum siding. It contains nearly 800 LEDs forming dozens of numeric displays spread across 14 control panels, each with an acrylic face laser-cut and etched with labels such as "Lunar Distance" and "Hydraulic Pressure". The pilot controls the rocket using a joystick and panels full of working switches, knobs and buttons. Underneath the capsule are three "thrusters" that shoot plumes of water and compressed air under the control of the pilot's joystick, simulating real positioning thrusters. Takeoff and docking sequences are augmented by a paint-shaker that simulates the vibration of a rocket engine. Sound effects complete the illusion, with a powered subwoofer that gives the rocket a satisfying rumble.<p>When it was built in 2011, rocket operations were controlled by three Atmega328 microprocessors on custom-fabricated printed circuit boards, running a small operating system, RULOS, built just for this project. A trench running from the house to the rocket carries 12VDC power for the lighting and electronics, water for the thrusters, compressed air, and several data signals.<p>Since 2011, the two-person team has upgraded it, here is a recent update from the makers:<p>One of the most visible changes is replacing the primary 4-line display with a slicker 6-line display (i.e., 6 rows of 8 columns of 7-segment LEDs). The audio synthesizer has been upgraded to a PCB that can generate 50khz, 16-bit audio. The interconnection bus, which had been flat IDC cable carrying individual on/off lines, was upgraded to a true I2C-based networked distributed system with over a dozen individually addressable targets, all interconnected by standard cat5 cable that carries both our I2C protocol and power. We also moved much of the electronics from 8-bit atmega328s to newer, 32-bit STM32F3's. RULOS has been expanded into a pretty general purpose embedded systems platform ported to 5 major lines of CPU (atmega, attiny, stm32, nxp lpc, and esp32). We've used it for dozens of other projects in the last 12 years, including a nanosecond-accurate timestamper, a GPS datalogger, an air quality sensor, various little electronic control boards for toys (e.g. these, and this), and an autonomous boat (that sank). It is all available on Github: <a href="https://github.com/jelson/rulos">https://github.com/jelson/rulos</a>.
Show HN: I made a website with musical exercises for beginner musicians
Show HN: I was frustrated with pricing of PagerDuty et al., so made one myself
Show HN: I was frustrated with pricing of PagerDuty et al., so made one myself
Show HN: Build AI DAGs with Memory; Run and Validate LLM Tools in Containers
I am working on a modular open source framework called Griptape that allows Python developers to create LLM pipelines and DAGs for complex workflows that use rules and memory.<p>Griptape can be thought of as "Airflow for LLMs," providing an alternative to the agent-based LangChain approach.<p>Developers can also build reusable LLM tools with explicit JSON schemas that can be executed in any environment (local, containerized, cloud, etc.) and integrated into Griptape workflows. They can also be easily converted into ChatGPT Plugin APIs and LangChain tools via adapters.<p>Tools can be thought of as any executable code that allows LLMs to interact with the outside world (via ReAct and Toolformer techniques): email, docs, spreadsheets, Jira tickets, web pages/search, etc.<p>The best part about tools is that they can be executed in isolated environments, significantly reducing potential security risks associated with running LLM-generated code and API calls.<p>What do you think? What are some of the use cases that you have in mind for reusable tools?
Show HN: Build AI DAGs with Memory; Run and Validate LLM Tools in Containers
I am working on a modular open source framework called Griptape that allows Python developers to create LLM pipelines and DAGs for complex workflows that use rules and memory.<p>Griptape can be thought of as "Airflow for LLMs," providing an alternative to the agent-based LangChain approach.<p>Developers can also build reusable LLM tools with explicit JSON schemas that can be executed in any environment (local, containerized, cloud, etc.) and integrated into Griptape workflows. They can also be easily converted into ChatGPT Plugin APIs and LangChain tools via adapters.<p>Tools can be thought of as any executable code that allows LLMs to interact with the outside world (via ReAct and Toolformer techniques): email, docs, spreadsheets, Jira tickets, web pages/search, etc.<p>The best part about tools is that they can be executed in isolated environments, significantly reducing potential security risks associated with running LLM-generated code and API calls.<p>What do you think? What are some of the use cases that you have in mind for reusable tools?
Show HN: Gsubpy, an interpreter for subset of Python, written in Go
Recently, I write an interpreter for subset of Python using Go. I haven't seen source code of CPython, all is just written according to my understanding of Python so there may be some unusual things. Hope you can play fun with it. Any suggestion is welcome, glad to get some feedback.
Show HN: DontBore – Accessible, fast, low-footprint Login sharing for the masses
Show HN: DontBore – Accessible, fast, low-footprint Login sharing for the masses
Show HN: DontBore – Accessible, fast, low-footprint Login sharing for the masses
Show HN: I made a SQL game to help people learn / challenge their skills
Show HN: I made a SQL game to help people learn / challenge their skills
Show HN: I made a SQL game to help people learn / challenge their skills
Show HN: I made a SQL game to help people learn / challenge their skills
Show HN: Uptrace – open-source APM (alternative to Datadog, NewRelic)
Show HN: Uptrace – open-source APM (alternative to Datadog, NewRelic)
Show HN: Chrome extension to hide AI/GPT related submissions from HN
Hi All, since I am consistently overwhelmed with all the all the ai/gpt news on the hn front page I built this simple extension to filter out such articles and show them on the extension popup if I'm in the mood to read. I am interested in the topic but just tired of reading the similar discussions (local models, llama on mac, ai taking away our jobs, etc) all the time. Every few days I search for topics on hn.algolia.com and go over any exciting development.<p>Ironically, since this was the first time I built an extension chat-gpt helped build 90% of the extension since . Also once installed, this show hn will disappear from your feed too :)<p>Firefox : <a href="https://addons.mozilla.org/en-US/firefox/addon/hacker-news-filter/" rel="nofollow">https://addons.mozilla.org/en-US/firefox/addon/hacker-news-f...</a><p>Github : <a href="https://github.com/prashantkhurana/Hacker-News-Filter-AI">https://github.com/prashantkhurana/Hacker-News-Filter-AI</a>
Show HN: Automatic prompt optimizer for LLMs
Show HN: Automatic prompt optimizer for LLMs