Table of Contents
Introduction
Context
What it will not have
support ardupilot as a backup
support Bluetooth
design around nucleo
similar to pixracer
6S or 3S battery cell monitor
What it will have
Fix servo backfeed issue
seeduino xiao
main proccessor EFS is already devving around
needs to have access to pins for EFS debugging w/ logic analyzer
gps connector for external gps
contains compass as well
Neo M9N or M9P (see arch doc for link)
same as we use on the drone
this device has the CMOS battery inside of it
wifi module on the board or external, EE designer choice
barometer on the board
a few neopixels on the board
low battery indicator (need to have input voltage sense) → done already?
power supplies support 6S 5S 4S and 3S battery input
maximize mechanical packaging benefits
support 30.5x30.5mm mounting pattern
just do connectors to sensors instead of on the same pcba
sd card on board for logging → done already?
Display screen on board or external (TFT variant)
support 1:1 harnesses for all external modules
JST connectors for all off board stuff
Add diode for Neopixel supply voltage, drop 0.7V to meet data sheet supply voltage to logic voltage ratio
If possible usb port for debugging mavlink? - Not mandatory
Why
improve functionality for ease of development and connectivity
integrated in one thing for flight tests, easy to verify it looks good
Justified in Tracking Antenna Long Term Vision & 2024-06-01 EFS Director Sync
Who
When
For Tracking Ant M3
Engineering
Architecture
https://uwarg-docs.atlassian.net/wiki/spaces/EL/whiteboard/2601156613Very straight forward
To-do
Here is an action list to help with collaboration with Siddharth. Set status to “In Progress” when you start something so I don't take it. Put “Finished” when done. I can start with the pcb after the schematic is done. I will base it off of the nucleo shield file to make life easy.
Schematic/Pre-PCB Tasks | Status |
|---|---|
Fix servo backfeed issue | |
Add seeduino xiao to schematic
| In Progress |
Determine the correct connector for the gps and add to the schematic | |
Add wifi module to schematic |
Bonus tasks: Can be saved for next rev but good if time | |
|---|---|
Select and add neopixels
| |
Select barometer and add to schematic
|
PCB Tasks (Moreso reminders here) | |
|---|---|
|
Seeduino
Using this variant for the headers so it is removable:
102010388 Seeed Technology Co., Ltd | Development Boards, Kits, Programmers | DigiKey
So the datasheet looks like something I’d see in an electronics kit tutorial I would do middle school so I had to look elsewhere for the footprint. For reference and to brighten up your day, here is the one of the first files you see in the datasheet zip 💀:
I will be going off the datasheet I found here on another website: Seeed-Studio-XIAO-Series-Package-and-PCB-Design.pdf (seeedstudio.com)
The seeduino with headers has 7 adjacent header pins on either side. For the female header sockets, these should do PPPC071LFBN-RC Sullins Connector Solutions | Connectors, Interconnects | DigiKey. I plan to mount them in the correct place for the seeduino and then have another set just mounted outside of that for EFS to use for debugging. Female headers should be best for that anyways since they are more protected.
Aside from that the seeduino does need much supporting circuitry. I will just yoink most of it from the Nathan’s seeduino tracking antenna board here hardware/Projects/Arduino_AAT at master · UWARG/hardware (github.com).