2025-01-30 Electrical Meeting

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?
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

TURN OFF DMMs WHEN DONE please!
- They are all dead :(
Merch order
- https://forms.microsoft.com/r/Vuh2jj372G
- Must fill by Jan 31st (tomorrow!!) if interested
Competition Interest Form: https://forms.microsoft.com/Pages/ResponsePage.aspx?id=h1o6cprzIkqSRz_CQMATlohH8WBFXHtOjCR7Pcx0oF1UQzFXMFFCSU4xNk5LUTc4RVZMNkRYOEZSTS4u
- Closes Jan 31st
Don’t forget to fill out the team roster: https://forms.office.com/r/ka0MJHJQ9D
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!

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
- Pegasus 2 Current Analysis - SysInt - WARG
- 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?

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
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 😞

In order of priority. These are the active design projects.

conf doc?
- Will be made after this meeting
Schedule meeting with Kenny Na Megan Lee Santosh Erathasari 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 inital development phase, last attempt at making this got archived due to limited bandwidth and also focus on additional features like I-Sense + RPP

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

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

is this going on board order? is it possible if we get some ppl to review ? -Meghan

Tracking Antenna Controller w ELRSAhmed Osman Nolan Haines

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