2025-02-06 Electrical Meeting
- Meghan Dang
- Ryan Scomazzon
Agenda
General updates for this week
Flight test
Reminders
Competition updates
Eclipse (fixed wing updates)
Project updates
Attendance
In person | Online |
|---|---|
|
|
General Updates
Comp Roster has been selected!
Thank you to everyone who applied, this was a unanimous decision amongst the leadership team, if you have any comments/questions/concerns, please let us know!
For more info, see:
For the full list, see Discord - Group Chat That’s All Fun & Games
10 people were selected and plus a waitlist of 4 for if people drop out or if the rules change.
2 EEs on main list plus 1 on waitlist
Bay door
There was an incident
Door was closed on foam, wasnt turned off, foam was removed, door fell and broke
SDC is mad at us
Please watch for things under the door when closing it
If you ever see something under the door, speak up
If this happens, open the door before removing things (this is what Graeme is mad about)
Be professional if people ask about it
See Discord - Group Chat That’s All Fun & Games for our official message about it
Work sessions
Tuesdays @ 6pm
update on what happened @Kenny Na
Saturdays @ 3pm
add plan for work sesh @Kenny Na
Start of term board order
@Kenny Na to order in person with Sarah on Friday!
sorry it took so long -meghan
Pick&Place machine
Getting moved to the bay so we can use it
Emailed Graeme, will see when it happens
PDB meetings? are these gonna be regularly scheduled?
@Andrew Chai
New Sticker!!!!!!!
Flight Tests
Last flight test
February 2nd
Result:
Foam Plane maiden flight !
it totally crashed LOL
prop did not generate enough thrust to fly
servos not rated for below freezing temperatures, very little pilot control
looking into buying new servos rated for lower temps
Detect target IR validation test and accuracy test - houston
Images were all white from the reflection of the snow - ggs software issue
Next flight test
February 8th (This Saturday)
Plan: Cluster estimation
Comp roster people should be at these now
Reminders
TURN OFF DMMs WHEN DONE please!
Don’t forget to fill out the team roster: Microsoft Forms
Make sure to clean up after yourself
Get the electronsite role if on site - reach out to @Ryan Scomazzon if you have issues
Competition syncs Mondays at 9pm
Eclipse sync Tuesdays at 8pm
Tracking antenna meetings
Sunday 2pm
Reach out if you need help on a project or bootcamp
Recruit your friends!
More fun with friends
If you like the team, then we can do even more with more people!
Pegasus/Competition Updates
Did more pump testing
Old pumps are garbooo - will not use
Tested if the new pump is bidirectional. It is not. That means we will need to buy a second one for the outlet.
Tested the new pump past its rated spec and works just fine.
This would require about 500mA from a 12V rail and can be controlled with water controller.
Did current analysis on the drone with @Megan Lee
12V rail has plenty of current to run these motors. No buck will be needed.
Pixhawk has no current to spare. Need supporting electronics.
Mech is strongly considering no winch (therefore no servos) after the pump testing
Since we arent hanging a pump, it is less risky to leave cable dangling.
SSD if needed?
Non EE related updates
New airframe for tuning is here
This is so someone can learn how to tune the drone
Should be made this weekend
What else should be done?
Make more LED boards?
Make more SSD?
Eclipse Updates
@Jerry Tian
Maiden flight electrical block diagram is done. @Tim Gu is getting started on the harness design. All harness sections below need a harness diagram.
fuselage
right wing
left wing
tail
@Edson Gao interested
Fried ELRS boards?
Not installing an antenna while boards is powered up means that transmission line is terminated with an open circuit, wave is getting reflected back and the doubling voltage destroyed the transmitter chip
Project Updates
In order of priority. These are the active design projects.
PDB @Andrew Chai
conf doc?
Will be made after this meeting
Schedule meeting with @Kenny Na @Megan Lee @Santosh Erathasari @Edson Gao to discuss project
Initial ideas
Power distribution board that supplies power to most/all electronic sub-systems of the board
Standard connector that provides common rails: 12V, 5V
Really wanna optimize efficiency, maybe play around with some cool ideas with soft switching, different converter topologies etc
Power conversion system will take priority during initial development phase, last attempt at making this got archived due to limited bandwidth and also focus on additional features like I-Sense + RPP
BMS @Andrew Chai
Will schedule to meet with @Sam Zhang
Any more interest from others not present at last meeting?
Looking into feasibility, integration, possible components + IC’s, active vs passive balancing
Concern about resources - This is more of a program than a project. Will be a lot of research
Work towards proposal? - @Sam Zhang
RPi Interface Rev C - Electrical - WARG (atlassian.net) @Kenny Na @Daniel Puratich
On JLCPCB cart and ready to be ordered
Trying to order DigiKey components + parts to fix ELRS+Buck
Will now be ordering 1x of buck only, 1x of modem only, and 1x of modem + STM
3x of the buck ICs and STM have already been ordered, so some of those will be left spare.
Pick & Place would be huge, this board has so many components
KiCad plugin to replace components with JLC versions - see if we can import Altium bom
12S ESC - Electrical - WARG (atlassian.net) @Ethan Abraham& @Andrew Chai
Done, waiting for board order
ELRS Redundant Diversity RX - Electrical - WARG (atlassian.net)@Nolan Haines
12S Pre-Charge Controller Module@Robert Tang @Kevin Li
is this going on board order? is it possible if we get some ppl to review ? -Meghan
3S ESC @Kenny Na @Santosh Erathasari @Megan Lee
Schematic still underway
need to figure out BEMF sensing system, STM I/O (for flash and debug)
OUTx pins do not have sensing (I believe), need to use OPx
It is advised to review the STEVAL board for reference
test points might be nice
Tracking Antenna Controller w ELRS@Ahmed Osman@Nolan Haines
verified current draw on both boards
about to order components either Friday or Saturday
architecture meeting either this week or next week
12V Input to 65W USB-PD Source - Electrical - WARG @Ian Van Den Steen
12V to 24V Boost Groundside Converter - Electrical - WARG @Tim Gu
Picked an option for a 960W 12-24V 40A convertor to buy off AliExpress for ~$100
Should be suitable for charging 4 x 7000mAh batteries simultaneously at 1C
Math and reasoning updated on the confluence page, can someone confirm it’s correct
Water System Controller rev 2 - Electrical - WARG @Shawn Yang
Sensor Cluster - Electrical - WARG @Michael Botros
On this board order
Not priority for bringup so wont be done in a work session soon
Can still be done if someone wants to take charge and do it asynchronously
Michael (offsite) is down to sync with someone about it
Might need to sign NDA?
Open Tasks
Peggy harnessing?
Replacing DMM fuze/batteries?
Reach out to greame about pnp