B-Sides: Reading, Race, and “Robert’s Rules of Order”
3 by bryanrasmussen | 0 comments on Hacker News.
Sunday, April 30, 2023
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New top story on Hacker News: Show HN: Homemade rocketship treehouse, from hardware to custom OS (2011-2023)
Show HN: Homemade rocketship treehouse, from hardware to custom OS (2011-2023)
8 by david_elson | 1 comments on Hacker News.
(This was previously submitted as https://ift.tt/g5Iz83E ) 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. 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. 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. Since 2011, the two-person team has upgraded it, here is a recent update from the makers: 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]( https://ift.tt/BTNMyDJ ).
8 by david_elson | 1 comments on Hacker News.
(This was previously submitted as https://ift.tt/g5Iz83E ) 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. 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. 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. Since 2011, the two-person team has upgraded it, here is a recent update from the makers: 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]( https://ift.tt/BTNMyDJ ).
Sunday, April 23, 2023
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New top story on Hacker News: Show HN: Quorbo – a quick and quirky quest for the quote
Show HN: Quorbo – a quick and quirky quest for the quote
4 by projectsforlife | 2 comments on Hacker News.
Hey HN, Today I'm launching Quorbo (www.quorbo.com): a simple letter-revealing game (think Wheel of Fortune with some twists) where you get 6 turns to guess the day's quote! It's my first post-parenthood side project and first web game. Being a working dad has caused me (for the first time, believe it or not) to focus on simplicity. Up until about a year ago, endless free time secretly plagued me... because I love _building_, and more free time meant: more room to add complexity. Not anymore! Quorbo is the first of my initial batch of three simple word games, and I can't wait to make more. Let me know what you think! (improvements, bugs / quirky behavior / stumbling blocks, any and all feedback welcome!) Enjoy!
4 by projectsforlife | 2 comments on Hacker News.
Hey HN, Today I'm launching Quorbo (www.quorbo.com): a simple letter-revealing game (think Wheel of Fortune with some twists) where you get 6 turns to guess the day's quote! It's my first post-parenthood side project and first web game. Being a working dad has caused me (for the first time, believe it or not) to focus on simplicity. Up until about a year ago, endless free time secretly plagued me... because I love _building_, and more free time meant: more room to add complexity. Not anymore! Quorbo is the first of my initial batch of three simple word games, and I can't wait to make more. Let me know what you think! (improvements, bugs / quirky behavior / stumbling blocks, any and all feedback welcome!) Enjoy!
Sunday, April 16, 2023
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New top story on Hacker News: Show HN: Quadratic – Open-Source Spreadsheet with Python, AI (WASM and WebGL)
Show HN: Quadratic – Open-Source Spreadsheet with Python, AI (WASM and WebGL)
33 by davidkircos | 11 comments on Hacker News.
Hi, I am David Kircos. The Founder of Quadratic ( https://QuadraticHQ.com ), an open-source spreadsheet application that supports Python, SQL (coming soon), AI Prompts, and classic Formulas. Unlike other spreadsheets, Quadratic has an infinite canvas (like Figma). As a result, you can pinch and zoom to navigate large data sets, and everything renders smoothly at 60fps. Our vision is to build a place where your team can collaborate on data analysis. You can write Python, AI Prompts, and Formulas in one spreadsheet feeding each other data and updating automatically. Quadratic is built using WebGL and Rust WASM. To render a large grid of cells smoothly, we tile the spreadsheet similar to google maps. If you are interested in the technical details, check us out on GitHub ( https://ift.tt/6pYIbqr ) You can use AI to help you write Python and then run the code directly in Quadratic. Then, we feed the result back to the AI model so it can follow along, help you debug, and modify your existing code. AI can also be used to directly generate data onto the sheet with prompts. It knows the context of what's on the sheet and how the data it's inserting fits in. Try it out. SQL is coming soon... stay tuned!
33 by davidkircos | 11 comments on Hacker News.
Hi, I am David Kircos. The Founder of Quadratic ( https://QuadraticHQ.com ), an open-source spreadsheet application that supports Python, SQL (coming soon), AI Prompts, and classic Formulas. Unlike other spreadsheets, Quadratic has an infinite canvas (like Figma). As a result, you can pinch and zoom to navigate large data sets, and everything renders smoothly at 60fps. Our vision is to build a place where your team can collaborate on data analysis. You can write Python, AI Prompts, and Formulas in one spreadsheet feeding each other data and updating automatically. Quadratic is built using WebGL and Rust WASM. To render a large grid of cells smoothly, we tile the spreadsheet similar to google maps. If you are interested in the technical details, check us out on GitHub ( https://ift.tt/6pYIbqr ) You can use AI to help you write Python and then run the code directly in Quadratic. Then, we feed the result back to the AI model so it can follow along, help you debug, and modify your existing code. AI can also be used to directly generate data onto the sheet with prompts. It knows the context of what's on the sheet and how the data it's inserting fits in. Try it out. SQL is coming soon... stay tuned!
Tuesday, April 4, 2023
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