rulos
nanoMODBUS
rulos | nanoMODBUS | |
---|---|---|
6 | 4 | |
16 | 207 | |
- | - | |
6.2 | 7.3 | |
15 days ago | 3 days ago | |
C | C | |
GNU General Public License v3.0 only | MIT License |
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Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
rulos
- Show HN: Homemade rocketship treehouse – hardware to custom OS
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Homemade rocketship treehouse, from hardware to custom OS [2011-2023]
(This was previously submitted as https://news.ycombinator.com/item?id=2246856)
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://github.com/jelson/rulos).
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I2C trace routing on multiple boards that connect together. I am unsure how what i need to consider.
Master Control Board, based on stm32f303. This is different than the others because it feeds 12 power into the RJ45 connector. It also regulates input power down to 10v for the bus driver.
nanoMODBUS
What are some alternatives?
Super-Simple-Tasker - Event-driven, preemptive, priority-based, hardware RTOS for ARM Cortex-M.
Mongoose - Embedded Web Server
nanopb - Protocol Buffers with small code size
libcurl - A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
zephyr - Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
Proxygen - A collection of C++ HTTP libraries including an easy to use HTTP server.
qpc - QP/C Real-Time Embedded Framework/RTOS for embedded systems based on active objects (actors) and hierarchical state machines
libwebsockets - canonical libwebsockets.org networking library
libhydrogen - A lightweight, secure, easy-to-use crypto library suitable for constrained environments.
KCP - :zap: KCP - A Fast and Reliable ARQ Protocol
C++ REST SDK - The C++ REST SDK is a Microsoft project for cloud-based client-server communication in native code using a modern asynchronous C++ API design. This project aims to help C++ developers connect to and interact with services.
RakNet - RakNet is a cross platform, open source, C++ networking engine for game programmers.