From 5f59059302562398ba67ec63dc4db860259b0f44 Mon Sep 17 00:00:00 2001 From: Peter Tanner Date: Mon, 5 Aug 2024 02:32:22 +0800 Subject: [PATCH] New content for S2 intake UWAA --- _posts/2024-03-05-UWAA-project-briefs-2024.md | 112 +++++++++++++++++- _posts/2024-03-06-UWAA-starter-guide.md | 19 +-- 2 files changed, 123 insertions(+), 8 deletions(-) diff --git a/_posts/2024-03-05-UWAA-project-briefs-2024.md b/_posts/2024-03-05-UWAA-project-briefs-2024.md index 23199d4..95a069f 100644 --- a/_posts/2024-03-05-UWAA-project-briefs-2024.md +++ b/_posts/2024-03-05-UWAA-project-briefs-2024.md @@ -42,6 +42,116 @@ The Telemetrum's Teledongle ground station is out of stock everywhere. We should - Make this a module card which can go into a standalone battery powered ground station which does not need a laptop to use. This can be helpful if our laptops run out of energy and there are no generators. +# WiFi-based video transmitter + +SAC now has a some award for the best live video downlink from a rocket. I think the best way in terms of quality would be to use WiFi equipment and transmit the video down using some directional antenna. This is a very ambitious project. + +## Success criteria + +- Milestone 1: Receive data at a rate of 4000 kbit/s over a distance of 10kft, LOS. +- Milestone 2: ??? + +## Scope + +- Video transmitter on the rocket and receiver on the ground + +## Hints and notes + +- You should check this project out [wifibroadcast](https://befinitiv.wordpress.com/wifibroadcast-analog-like-transmission-of-live-video-data/)... looks exactly what we need, it's designed for FPV drone applications. +- Make a comparison of cost vs data rate? +- This project is very ambitious and we will probably have to keep this text updated +- Laptops have PCIe NIC cards, check if an SDIO-based NIC is available which can be used on a raspberry pi +- An option is to use a COTS laptop and temporarily bring out the coax to a big antenna? + +# HPIB/GPIB to USB adapter for HP8560A + +We have an [old spectrum analyzer](https://www.petertanner.dev/posts/HP-8560A-spectrum-analyzer-as-a-frequency-generator/) which outputs data over [IEEE-488, or GPIB/HPIB](https://en.wikipedia.org/wiki/GPIB?&useskin=vector). We'd like to connect the spectrum analyzer to a laptop over USB. + +## Success criteria + +- Create one plot on your PC connected to the spectrum analyzer over your GPIB adapter, use [this software](http://www.ke5fx.com/gpib/7470.htm) to receive the plot. + +## Hints and notes + +- GPIB uses 5V so you may need to [level shift](https://en.wikipedia.org/wiki/Level_shifter?&useskin=vector) depending on the maximum GPIO voltage of your chosen microcontroller +- You may choose to pick a microcontroller with USB transceiver built in, or a microcontroller combined with a UART-USB bridge IC. +- You are meant to use these [bus transceivers](https://www.ti.com/product/SN75160B), but some designs have gotten away with not using them for single-device applications. It is up to you whether you want your adapter to be compatible with GPIB and accept multiple devices, or only for adapting one device to one usb. +- Search up "GPIB to USB" for other existing designs floating around on GitHub. +- You'll probably need to watch a video on choosing components. I have recorded slides that I've presented last semester, but any video online will do. + +## Milestones + +1. Choose your parts (microcontroller mainly, and other major parts such as interface ICs or level translators) +1. Create a schematic (Once you get to this stage let me know so I can give you Altium training) +1. Create a PCB (Once you get to this stage let me know so I can give you Altium training) +1. Request design review and get the PCB made +1. Program the PCB (Should be simple since it's just adapting protocols, since this project is more about the PCB side than programming you can rip off some GPIB library code) + +# Flight Computer programming + +While the hardware will be different, the concept of a flight computer doesn't really change. I will set you up with some breakout boards and you will program a flight computer on an STM32 microcontroller. + +## Success criteria + +- Program a flight computer which can: + - Set off a pyrotechnic charge using a basic relay when apogee and a set alittude is released + - Log information from all sensors to an SD card +- Extension: Maintain a radio downlink + +## Hints and notes + +- The standard IDE is STM32CubeIDE, but if you hate Eclipse-based IDEs like me you can use the "Embedded tools" VSCode extension + - To use this extension you should install STM32CubeMX, STM32CubeCLT and STM32CubeProgrammer. +- Use STM32CubeMX for configuring the GPIO pins/Alternate functions +- You can also use STM32CubeMX to include a real time operating system (RTOS), which will make your life easier since it allows you to have threads which can allow for some "concurrency" (actually multitasking). +- You may use C or C++, although I don't find many C++ features useful in this context. +- Look up libraries for your sensor part number to rip off. ST provides "platform independent drivers (PIDs)" which may be useful (you just need to implement the read/write function stubs by populating it with the appropriate code to call HAL functions) +- Please don't hesitate to ask me questions, programming microcontrollers are quite fiddly. + +# Squib driver demo board + +Squib drivers are used in automotive applications to safely deploy airbags, which use e-matches just like in our avionics. The current avionics uses a current-sense amplifier and analog-to-digital converter. When an ADC interrupt is triggered, the microcontroller switches off the channel momentarily. This system is quite convoluted and failure prone, and having an automotive-certified part would remove this risk even if 10x more expensive. + +## Success criteria + +- Create a board of "any" size (it can be larger than normal, up to `100 mm * 100 mm`) which can accomodate an automotive squib driver. Ensure you use terminal blocks or some high-current connector for the pins that connect the driver to the squib/e-match. +- Make sure every other pin is accessible through a pin header +- Follow the application note/eval board design if one exists +- Look up parts on mouser or digikey, search squib driver +- Also see if any of these parts are available on JLCPCB directly for cheaper +- Put LEDs and stuff on the board to indicate visually! +- Some parameters to consider are the cost, how many channels are available per IC, the minimum voltage and firing current for example? + +## Milestones + +1. Choose your parts (Make a comparison table based on the parameters I suggested?) +1. Create a schematic (Once you get to this stage let me know so I can give you Altium training) +1. Create a PCB (Once you get to this stage let me know so I can give you Altium training) +1. Request design review and get the PCB made + +# ESP32 development board + +We typically use STM32 microcontrollers for flight computers, but ESP32 may be a good alternative since it has support for WiFi and BLE, which may simplify interfacing with the flight computer. One example of this is the Blue Raven flight computer, which has a mobile phone application. + +## Success criteria + +- Make an ESP32 dev board with basics such as voltage regulator, USB connection. Also include a WiFi antenna on the board (either integrated into the PCB or using a pre-made sheet metal stamp antenna, ask me when you get to this stage) +- Make sure it has headers spaced correctly so we can use it on a standard breadboard +- Look at arduinos for design ideas. + +## Hints/notes + +- I'm not too sure what the ESP32 ecosystem is like, I think it would be good to start off by doing a comparison of each of the parts (flash, ram, peripherals, pin count, cost...) and then we can decide which part to use. +- Ask me when you get to the antenna design stage which is in the PCB design phase (after schematics) + +## Milestones + +1. Choose your parts (Make a comparison table based on the parameters I suggested?) +1. Create a schematic (Once you get to this stage let me know so I can give you Altium training) +1. Create a PCB (Once you get to this stage let me know so I can give you Altium training) +1. Request design review and get the PCB made + +