Mech

Electrical

Capacitor analysis

@Anthony Zhelnakov measured inductance of the existing harness, very small, less than 1 uH

don’t need extra capacitors

EFS

Wind Estimation

logs analyzed in order to find propeller drag: from Feb 3rd FT

• @Anthony Luo will tell someone about this in EFS meeting

people are looking at it

Motor control / FFT bidir dshot?

• @Anthony Luo will tell someone about this in EFS meeting

people looking at it

Mech

Houston Sensor Mounts

• We have 1 op flow mounted on houston

• We do not have a second rangefinder (1D lidar)

  • We would need to take the 1D lidar off pegasus in order to fly it on houston.

The next time we fly autonomous OA with terrain following, we will want the rangefinder on houston - within next 3 weeks mount complete

+ do not need lidar on peggy at the moment

Electrical

Houston Sensor Harnessing

Lot of extra wires on houston at the moment, starting to interfere with compass

put some time towards new houston harness, good opportunity to learn/teach during potentially an EE work session

things like crimping wires/ anything we need to replicate for pegasus we should try out on houston first!

Rangefinder harness needs to be made too (see above mech section)

EFS

OFS use

Check that OFS is configured properly? (vel_X vel_Y source)

• EFS to add to asana?

Autonomy

Mechanical

Mounting

VTX mount may need to be done again.

Depends if we change VTX location/item based on interference!

Monster mount exists. nice

Electrical

VTX harnessing

@Neel Patel @Neel Patel pre-crimped JST arrived, can you clean up this harness?

general antennas

Antenna mounting locations.

• some antennas may need particular connectors or lengths that will be difficult to source

• gemini for example, cable maybe not easily extended…

• LTE/VTX/GEMINI antennas places so they don’t interfere with each other.

  • as far away from each other as possible

should try 5.8GHz VTX

EFS

RC Controller Mapping

standard template to be created at some point @Anthony Luo @Megan Spee

• to understand logical switches, etc

Ardupilot Mux Output Config

for next FT (currently untested). also wiring issues with current system?

• before next FT

Ardupilot OSD Config

To investigate dropouts

+ to configure OSD to have important information!

• before next FT

Autonomy

LTE Video?

assigned out, blocked kinda. difficult to parallelize.

skip

Mech

Gemini case?

assigned out

will check on it tomorrow meeting

Electrical

RFD Board

ready to test @Yuchen Lin

ELRS Gemini PCB

XT30 not arrived yet

EFS

Gemini LinkStats

• Gemini linkstats not being passed through to TX16? (Only relay linkstats)

  • Assigned to @Owen Grimm

want to flight test soon. received new receivers recently so we are no longer blocked.

building custom version of firmware after reading week!

• needs to pass ELRS unit tests etc. can just fly on custom if this doesn’t pass.

Improved Streaming

• See Long Range Streaming by qqqlab · Pull Request #2113 · ExpressLRS/ExpressLRS · GitHub

  • Assigned to @Aryan Kashem, but no update

• ELRS Airport is unable to give sufficient datarate for some of our ground station uses in it’s current state

• Not sure if this will be comp ready. either this, or buying for xbees for the tracking antenna - @Anthony Luo

can’t find RP1. : /

Post-flight test thoughts on tracking antenna: (last meeting)

code was polling GPS too often. causing motors to twitch.

got it working again by initiating the polling after GPS has a lock.

another issue - a GPS doesn’t get any satellites? resolve by trying another GPS, maybe.

Autonomy

LTE

• Mavlink packets have signing! Warg laptop is the only one that can communicate with this.

  • be sure to stay close to the warg laptop and also have service on your phone when hotspotting the warg laptop.

  • possibly android phones you can select a frequency

  • affected by many things

  • Will add this to the next flight test request document as a checklist item @Megan Spee

LTE monitoring script:

script written thurs, tested friday. Issues with libraries. getting logging script ready for next flight test @Maxwell Lou !

@Nathan Green got this working saturday?

@Mihir Gupta @Maxwell Lou

telemetry forwarded to server, routed to ground station.

for image transmission: assumed we were using zerotier. Can we continue to use zerotier for image transmission?

• Yes - @Nathan Green

• zerotier still running

• takes a long time to reconnect if it disconnects

consider other VPN services? - Tailscale?

• Open to testing this on a spare RPI

• potentially the same thing on the backend

• also good engineering to exhaust all available options

architectural background

TX assumes RPI/GS are on the same network. assume you can find the IP of the other computer instantly w/o SSH/FWD’ing.

Mech

Pegasus

• Peggy 2 plates cut, a little bit more flexible than we thought they’d be but we’ll see how they do under tension, likely will be fine

• Gonna push on manufacturing during the week this week to get the center lock and arm connectors done

• Still working on new landing gear redesign

Houston

Houston landing gear request via @Anthony Luo from jan 29

• couple times houston tips over when it lands

• requesting landing capability while in ‘slight translational motion’

Estimated 300 g additional weight max for new landing gear

Discord - Group Chat That’s All Fun & Games

@Smile Khatri - PM for redesigning houston landing gear

Electrical

LED Board

messed up MCU pinout in the PCB design gg
Found MCU replacement https://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny13A-Data-Sheet-DS40002307A.pdf, will place an order later this week

Sensor harnessing

Need appropriately sized wiring looms(?) for the sensors.

Potentially crimping own wires? Colour standards? Sheaths? etc…

• start making harness schematic. See @Michael Botros version? @Mena Azab ?

• physical locations should also be updated in arch doc! :D

Power Harnessing

Smaller / lighter weight battery harness to be made. +4 configuration only. Current wire lengths are significantly longer than necessary.

• within reason! - do not risk cable integrity

• also consider different series configs? @Anthony Luo

saving weight, anything counts, its a drone

@Anthony Zhelnakov made a copy of the power harness (from battery to current module) already, wanna confirm plans for this.

for current Pegasus, we want to shorten the wires.

for new Pegasus,

• same “+” configuration as the current one?

• @Nathan Green proposed a “butterfly +” configuration?

questions about the batteries

Houston Harnessing

pls clean this up ! Lots of compass interference issues & extra weight that we don’t want to be carrying

good test run for trying things before doing the same on peggy

lots of time to clean it up and test things

EFS

LED Board Firmware

• @Owen Grimm tried flashing the firmware to the microcontroller after the board assembly. They encountered some obstacle on flashing, and I think they will try the high voltage programming later because this is what written in the data sheet the proper way to do flashing

want EE to build an on board circuit that allows us to flash? @Derek Tang

arduino mega <> LED board. LED board not sending anything.

follow up in thread

Autonomy

Mech

Tracking Antenna Mechanical

• First big antenna tracker is almost done mechanically, will get a better idea what need to be done at mech meeting tomorrow

Electrical

Nucleo Shield

pcb ready for 1st round of review

EFS

Arduino Tracking Antenna

• Lost ELRS receiver, RP. Another procurement coming next week.

• Had issue where we were polling GPS too often. fixed now.

• GPS getting 0 sats when outside -new gps on the way

Autonomy