2025-01-30 Electrical Meeting
- Meghan Dang
- Kenny Na
- Ryan Scomazzon
Agenda
General updates for this week
Flight test
Reminders
Competition updates
Eclipse (fixed wing updates)
Project updates
Attendance
In person | Online |
|---|---|
@Ryan Scomazzon @Kenny Na @Megan Lee @Santosh Erathasari @Edson Gao @Jerry Tian @Arnav Dalmia | @Andrew Chai @Aathithan Karunaran @Joel Crasto @Khalil Ramzi @Sam Zhang @Tim Gu @Ahmed Osman @Himansh Garg @Meghan Dang |
General Updates
Work sessions
Tuesdays @ 6pm (sorry we missed this Tuesday)
Saturdays @ 3pm (#2 this week! 6S Servo assembly clean-up)
Start of term board order
Waiting on @Meghan Dang to complete order, hopefully monday
@Kenny Na to order in person with Sarah on Monday!
Pick&Place machine
Prob worth trying for RPi Interface Rev. C
@Santosh Erathasari?
@Edson Gao
Looked at DMMs, one of them is just cooked even with a new battery and one of them is hard to get at the fuse. Didn't bother swapping fuses from the dead one cause you can’t see if it is intact.
Tracking antenna meetings
Sunday 2pm
Flight Tests
Last flight test
Plan: Test Target Detect using IR camera (Picamera)
Cancelled due to lack of reasonable plan, non urgent timeline, and ability to add on another test
Will be shifted to the next flight test
Next flight test
February 2nd (This Sunday)
Plan:
Foam Plane maiden flight ! ← these are always fun
Detect target IR validation test and accuracy test - houston
Reminders
TURN OFF DMMs WHEN DONE please!
They are all dead :(
Merch order
Must fill by Jan 31st (tomorrow!!) if interested
Competition Interest Form: Microsoft Forms
Closes Jan 31st
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
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
Open Tasks
Peggy harnessing?
Replacing DMM fuze/batteries?
Reach out to greame about pnp