vault backup: 2025-02-05 14:38:06

.stversions/OneNote/OSD/CarrierBoard/Baseboard Design~20250203-093657.md

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+## Requirements
+
+Mini-usb connector
+
+Power
+
+Camera connector
+
+Hdmi?
+
+Females for Coral SoM
+
+## How to connect to the cameras?
+
+* make internal usb-hub? 2 usb2.0 to usb3? [http://www.ti.com/product/TUSB8020B](http://www.ti.com/product/TUSB8020B)
+
+See files here [https://hackaday.io/project/20790-nanohub-tiny-usb-20-and-30-hubs](https://hackaday.io/project/20790-nanohub-tiny-usb-20-and-30-hubs)
+
+[https://github.com/ltomov/4-port-usb-hub](https://github.com/ltomov/4-port-usb-hub)
+
+[https://stackoverflow.com/questions/41642846/how-can-i-use-get-data-from-a-camera-using-the-i2c-and-arduino-or-raspberry-pi-3](https://stackoverflow.com/questions/41642846/how-can-i-use-get-data-from-a-camera-using-the-i2c-and-arduino-or-raspberry-pi-3)
+
+[https://www.microchip.com/design-centers/usb/usb-hubs-and-devices/products/usb-hubs](https://www.microchip.com/design-centers/usb/usb-hubs-and-devices/products/usb-hubs)
+
+[https://superuser.com/questions/1159167/usb-2-0-high-speed-on-all-ports](https://superuser.com/questions/1159167/usb-2-0-high-speed-on-all-ports)
+
+[https://superuser.com/questions/1234113/how-to-get-more-full-speed-usb-2-0-ports-on-a-modern-laptop](https://superuser.com/questions/1234113/how-to-get-more-full-speed-usb-2-0-ports-on-a-modern-laptop)
+
+  
+
+Maybe use other camera?

.stversions/OneNote/OSD/CarrierBoard/CAD - Software~20250203-063558.md

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+KiCad - Open Source
+
+What could be used to simulate a circuit?

.stversions/OneNote/OSD/CarrierBoard/Debugging V0.1.2~20250203-093646.md

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+Preparation
+
+- [x] How to integrate sara chip. Get LTE-M sim-cards.
+
+- [ ] Testing Protocol: Define exactly what tests are being done and why and write everything down.
+
+- [ ] How can I use JTAG?
+
+- [ ] Buy Heat camera
+
+**Todo Working Verification:**
+
+1. - [x] Visual Inspection. Are all parts at the right place?
+2. - [x] Power Inspection. Hook up 5V supply and test all power rails.
+3. - [ ] LED inspections. Are the LED's working as expected?  
+    No. Orange led is to weak. Blue led is always on, without network connection.
+4. - [x] See if coral works. Can I ssh into it?
+5. - [x] Test connectors. USB-A, USB-C
+6. - [ ] Test connection through UART-pins to flight controller
+7. - [x] Test fan: Does it work properly?
+8. - [ ] Test SARA-Chip. Does it boot? Can I communicate with coral? Read instructions carefully.
+9. - [ ] Test arducam with google coral: Is a custom driver needed?  
+    It has not worked so far.
+10. - [ ] Test Usb-cams with coral: does this work?  
+    Yes it worked without any problems.
+11. - [ ] Test both UART connections: do they send what you want?  
+    
+12. - [ ] Is I2C working properly?
+13. - [ ] Use JTAG to verify proper functionality:
+14. - [ ] Is WIFI and Bluetooth working properly, or is it interfering with something?
+
+**Todo Performance Testing:**
+
+1. Compare different antennas: All for the same SARA and then do bandwidth test in different conditions: Indoors, Outdoors, underneath trees, between skyscrapers, around glass, etc.
+2. Compare usb plugs on both sides: Is there a bandwith difference? Use iPerf for testing
+3. Test connection between corals through usb-c: does it work? What bandwitdth? Compare to 2 devboards.
+4. Measure current draw of the whole board
+5. Is airflow from drone enough? Measure temperature.
+6. Heat camera: look at thermal performance of pcb. Are there areas where it can be improved
+
+Possible fixes for problems:
+
+Quickly make intermediate board: double sided with coral connectors. Like that you can access the pins that are hidden.
+
+Questions:
+
+- [ ] Why is orange led so weak?

.stversions/OneNote/OSD/CarrierBoard/Design Rules Overview~20250203-063542.md

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+## MIPI design Rules
+
+Goal: 100 Ohm Impedance
+
+  
+
+Track width:
+
+Track spacing:
+
+  
+
+Via hole:
+
+Via size:
+
+Via spacing:
+
+  
+  
+
+## USB micro design Rules
+
+Goal: 90 Ohm differential Impedance and 90 ohm differential via impedance
+
+  
+
+Track width: 0.2032 mm
+
+Track spacing: 0.127mm
+
+Gives 89,886 Ohm
+
+  
+
+Via hole: 0.2
+
+Via size: 0,75
+
+Via spacing: 0,85
+
+Gives 89,834 Ohm

.stversions/OneNote/OSD/CarrierBoard/Design Rules~20250203-063554.md

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+## Controlled Impedance
+
+[http://design.iconnect007.com/index.php/article/62513/what-is-trace-impedance-and-why-do-we-care/62516/](http://design.iconnect007.com/index.php/article/62513/what-is-trace-impedance-and-why-do-we-care/62516/)
+
+  
+
+## Dont forget at end:
+
+- Double check impedance control
+    
+    - includes vias and removing of stubs (backdrilling of vias)
+- No traces at board edge
+- Many stitching vias everywhere

.stversions/OneNote/OSD/CarrierBoard/Electronic Topics to Learn~20250203-093659.md

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+[What are shunts?](https://en.wikipedia.org/wiki/Shunt_(electrical))
+
+Transmission Line Theory

.stversions/OneNote/OSD/CarrierBoard/Ethernet research~20250203-063559.md

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+Question stack exchange EE
+
+  
+
+Hello
+
+  
+
+My goal is to set up a high-speed network link between two identical processors (Qualcomm SOMs) that will be present on the same PCB. Since I have severe restrictions on weight I cannot use the standard ethernet way with an RJ45 and a cable to set this up. The two possible interfaces on the processors for the network link are PCIe 3.0 or a USB 3.1 GEN2 interface.
+
+  
+
+My current idea is to use an ethernet bridge IC like the [LAN7430 from microchip][1] at the PCIe-port on both processors and add a single ethernet transformer (e.g. [H5084NL from pulse electronics][2]) in between. This would set up an ethernet link 1000BASE-T between the two processors. According to [this][3] and [this question][4] the magnetics are recommended to provide a stable connection. They also mention the problem with connections that are shorter than 1m, which I don't know yet how to solve.
+
+  
+
+Is this the best solution for this problem? Since I do not have access to a MAC-port I cannot implement the direct MAC to MAC connection as proposed by [user dim in this question][4].
+
+  
+
+With this solution, using the PCIe port, I could achieve 1Gbit/s with the 1000BASE-T Ethernet. According to the USB specifications, the USB 3.1 GEN2 interface is capable of achieving up to 10 Gbit/s, which would be preferable for my application.
+
+  
+
+Is it possible to implement a reliable USB network without cable
+
+  
+  
+  
+
+[1]: [https://www.microchip.com/wwwproducts/en/LAN7430](https://www.microchip.com/wwwproducts/en/LAN7430)
+
+[2]: [https://productfinder.pulseeng.com/product/H5084NL](https://productfinder.pulseeng.com/product/H5084NL)
+
+[3]: [https://electronics.stackexchange.com/q/90330/255394](https://electronics.stackexchange.com/q/90330/255394)
+
+[4]: [https://electronics.stackexchange.com/q/378310/255394](https://electronics.stackexchange.com/q/378310/255394)
+
+  
+  
+
+[https://www.one-tab.com/page/pPYRBiErRWahS_zJR4kc7g](https://www.one-tab.com/page/pPYRBiErRWahS_zJR4kc7g)

.stversions/OneNote/OSD/CarrierBoard/Final Drone Implementation~20250203-093644.md

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+- Use strain relief for the antennas (see [here](https://learn.sparkfun.com/tutorials/three-quick-tips-about-using-ufl))

.stversions/OneNote/OSD/CarrierBoard/FlightController~20250203-093648.md

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+Partslist
+
+- [ ] Microprocessor F7
+
+- [ ] Gyro
+
+- [ ] 8MHz Oscillator
+
+- [ ] Voltage regulator 3.3V (linear vs switching or both?)
+
+- [ ] Usb connector (TX/RX) + 2x 22 Ohm R)
+
+- [ ] Shottky Diode (if 2 5V entries are there to, eliminates interference…)
+
+  
+
+Resistor sizes
+
+R: 0402
+
+C: 0805

.stversions/OneNote/OSD/CarrierBoard/IoT-CHIP~20250203-093645.md

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+Overview:[https://www.digikey.com/en/articles/5g-is-a-long-way-off-use-ready-made-lte-4g-modules-remote-iot-sensing](https://www.digikey.com/en/articles/5g-is-a-long-way-off-use-ready-made-lte-4g-modules-remote-iot-sensing)
+
+[https://www.iotforall.com/cellular-iot-explained-nb-iot-vs-lte-m/](https://www.iotforall.com/cellular-iot-explained-nb-iot-vs-lte-m/)
+
+  
+  
+
+UBlox
+
+[https://www.u-blox.com/en/cellular-modules](https://www.u-blox.com/en/cellular-modules)
+
+  
+
+Sierra Wireless
+
+[https://www.sierrawireless.com/products-and-solutions/embedded-solutions/](https://www.sierrawireless.com/products-and-solutions/embedded-solutions/)
+
+  
+
+## Questions ublox
+
+- combined gps and cellular vs both as standalone?
+- SARA-R4 vs R5 vs N3 vs UBX-R5

.stversions/OneNote/OSD/CarrierBoard/Learning from DJI Mavic Air~20250203-063553.md

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+[https://medium.com/amazing-hardware/mavic-air-2-dji-uav-disassembly-analysis-38783979b95a](https://medium.com/amazing-hardware/mavic-air-2-dji-uav-disassembly-analysis-38783979b95a)

.stversions/OneNote/OSD/CarrierBoard/Lessons V0.1.2~20250203-063554.md

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+Implement in next version:
+
+- [ ] Shunt resistor to measure current draw of coral or of the whole board.
+
+- [ ] Use the same gpiopin for fancontrol as the dev-board
+
+- [ ] Better label output pins.
+
+- [ ] Make connectors asymetrical for good connections.
+
+- [ ] All pins that eventually are needed should be exposed somehow (testpoint or connector)
+
+- [ ] Add LED's to GPIO pins to know their state
+
+- [ ] Add switches or jumpers to power only certain parts of the board
+
+- [ ] Connect Enable pins of Ic's to pin headers or gpios of the processor. In case it is needed it can be used. E.g power supply of SARA chip
+
+- [ ] Add via or tp for everything you eventually want to measure.
+
+- [ ] Place testpoint on vcc on last cap before entering ic.
+
+- [ ] Add gpio level shifter
+
+- [ ] Swap rx tx sara
+
+- [ ] If v0.2 is still mainly for debugging: add buttons for reset and pwr pins: as in [this open source project](https://cdn.sparkfun.com/assets/a/c/b/1/0/lte_cat_m1_shield_sara-r4_schematic.pdf)
+
+  
+
+- Implement HDMI in first version to be able to debug: Is it even booting up?
+- Make pin connectors for all essential pins: Boot pins, boot configure pins, reset pins, etc: Like this you have the possibility to measure the signal and overwrite it if necessary.
+- First version should just be the coral connectors + power and all necessary things to boot. All other accessories
+- Ask google before starting development what is the absolute minimum bare bones for a working base-board.

.stversions/OneNote/OSD/CarrierBoard/Overview~20250203-063558.md

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+Submodules
+
+- Power Distribution Board
+- Flight Controller
+- Coral SoM Footprint

.stversions/OneNote/OSD/CarrierBoard/Questions for Thundercomm~20250203-063557.md

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+- [ ] Will there be a document for registers? To reprogram the QUP?
+
+- [ ] What are the transmission line pulse (TLP) ESD ratings of the SOM?
+
+- [x] Are GPIOs configurable as Open-Drain? Or are all push-pull?
+
+- [x] Max current on gpio pins?
+
+- [ ] Can we use different UART for debugging? Normally set via device tree… how can it be done with the RB5?
+
+  
+
+## Cameras
+
+- [x] Can the same camera have 2 different I2C adresses? Or do I need to use 2 buses?
+
+- [x] MIPI-lines: length matching: are the lines the same length on the SOM?
+
+- [x] Für cameras: SPI oder Control pins GPIO. See cam1 vs cam2
+
+- [x] Ask about Masterclock pins that are connected to Strobe. What are they for?
+
+- [x] Camera datasheet und navigation mezzanine: not same schematics for camera connector.

.stversions/OneNote/OSD/CarrierBoard/TODO~20250203-063557.md

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+## Camera Interface
+
+- [ ] Check camera connectors once we decided on cameras. Do those mipi cameras have a reset or pwdn? update them...
+
+- [ ] Check I2C connection: --> what is it needed for?
+
+## General
+
+- [ ] Add Testpoints (TP) as in the dev-board to test circuits with multimeter/oscilloscope
+
+Do we need isolators to break ground loops?
+
+[https://www.ti.com/product/ISO7762](https://www.ti.com/product/ISO7762)
+
+  
+
+See:
+
+[https://docs.odriverobotics.com/ground-loops.html](https://docs.odriverobotics.com/ground-loops.html)

.stversions/OneNote/OSD/CarrierBoard/ToDo Carrier RB5~20250203-063557.md

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+# OneSec Monocopter 1
+
+- [ ] Fast working implementation of GNSS
+
+- [ ] Worldwide LTE-Chip (Quectel)
+
+- [ ] Power Distribution
+
+OneSec Monocopter 2
+
+- [ ] Night Vision Cameras & IR-Flashlights
+
+- [ ] Solar panels from [Flisom](https://www.flisom.com/wp-content/uploads/2017/08/Datasheet_ultra-light-CIGS-eFilm-solar-cell-material.pdf)
+
+- [ ] Better Motors (custom carbonfiber)
+
+- [ ] Snapdragon 888 or later generation
+
+- [ ] Regenerative breaking
+
+- [ ] Aerodynamic improvements
+
+- [ ] Graphene Batteries (removes necessity for battery swap)
+
+- [ ] Better propeller blades
+
+- [ ] High precision GNSS + Antenna

.stversions/OneNote/OSD/CarrierBoard/Todos for V0.2~20250203-063556.md

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+**GENERAL TODOS**
+
+  
+
+- [ ] Proper Power connector to connect with PDB
+
+- [ ] Our own gps module
+
+- [ ] Working heat-sink solution: --> place corals further apart from each other.
+
+- [ ] Make the board smaller! --> Weight saving, less expensive
+
+- [ ] Use both sides for components.
+
+- [ ] Put more LED's:
+
+- [ ] Make more pinouts if V0.2 is still a debug board.
+
+**Ideas:**
+
+Do we want to integrate more sensors onto the board? Temperature, pressure, gyro? #question
+
+How do we measure the position of the flaps/payload bay? #question
+
+Do we need more storage? Implement flash storage or sd-card? #question
+
+Buy sara board from [sparkfun](https://www.sparkfun.com/products/14997)?
+
+**To Decide before start:**
+
+- [ ] USB-C yes or no?
+
+- [ ] MIPI yes or no?
+
+- [x] Open drain pins: use own transistor or device tree approach? --> Open drain also for PWR_ON
+
+- [ ] DEBUG board: yes or no?
+
+- [ ] Stress test antenna sara.
+
+**Precise TODO's:**
+
+- [ ] Remap SARA Rx/Tx
+
+- [ ] Decide scope of board: still debugging?
+
+- [ ] Rewire orange coral status led: with datasheet decide current limiting resistor to have full power at steady on. --> allows to regulate dimness with pwm.
+
+- [ ] Use large size resistor for important settings: e.g. voltage regulators
+
+- [ ] Make single pin of gnd to attach oscilloscope crocodile clamp
+
+- [ ] Find Power connector to connect to PDB.
+
+- [ ] Remove 0-Ohm resistors where they are not needed anymore, but provide testpoints!
+
+- [ ] Don't use Testpoints: Use holes like jtag: you can later on add pins if needed.
+
+- [ ] Add LED to id-pin of cc-control of usb-c (it is a open drain pin) --> when pulled to gnd it should activate a transistor that connects the led to gnd.
+
+- [ ] Gpio link to do hard reset between corals.
+
+- [ ] Flight controller connectors:
+
+- [ ] 2x UART
+
+- [ ] 2x GND Power
+
+- [ ] 2x 5V Power
+
+- [ ] ?x GNSS connection
+
+- [ ] ?x GND between lines for shielding
+
+- [ ] General Connectors
+
+- [ ] 1x GND, 5V for RC (asym-conn)
+
+- [ ] 2x GND, 5V for fans (asym-conn)
+
+- [ ] 5x GND, 5V DNP conn for eventualities
+
+- [ ] same with 3.3v and 1.8V