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Weekly Updates

Member

Main Project

Status

Update

Action Items

Ari Wasch

BMS

⛔

David Choi

DD Current Sense / Comms

✅🚹

Any update on the DD Current Sense part selection? Any update on Comms?

  • Had a quick meeting with Logan to learn about Altium basics

  • Did more research into multi-frequency comms set-up; nothing conclusive yet

  • Set-up one frequency comms system for software to do testing

  • Do more research into multi-frequency set-up

  • Start 7-seg portion of DD current sense board

Farris Matar

PDB/OTS BMS

✅🚹

  • Almost got scammed $1k USD trying to order the charger - we may not be able to order the selected charger due to their PayPal not working

  • Learned how the BMS connects to the battery, downloaded companion app on my phone

  • Outlined required items to purchase in order to make the connections with the battery and BMS

    • Summarized here:

View file
nameList of Things Needed for BMS.txt

  • Purchase the required items

  • Once they arrive, make the harnesses and connect the battery to the BMS, use companion app to see how well it works

  • Figure out how to proceed with the battery charger

  • Draft block diagram showing how all the power modules connect to the downstream devices/loads. See table below for all the devices that need to be powered for SAR

Logan Hartford

Lead

✅

  • Finish setting up Altium team licenses

  • Sign up for Altiums training curriculum

  • Review the new DD current sense schematic if avaialble

  • 5V layout review

  • Make guide for getting power rails up

Muhammad Tanveer

Comms

✅🚹

Any update on Comms?

Rayaan

5V OTS Buck

✅

Any update on the power replacements?

  • Ordered the 4 buck converters

    • 5V arrived

    • Variable arriving soon

    • Power requirements for ZED2

Rishith Bomman

PDB

✅🚹

Any updates on PDB Rev 4.1?

  • License

  • Get started with DD

Wolfgang Windholtz (Deactivated)

Science / Support

✅

Yuchen Lin

DD Current Sense / Comms

✅

Any update on the DD Current Sense part selection? Any update on Comms?

  • does not got a chance to work on any of it.

  • But take sometime to study some basics of electronic principle

  • will finish the dd-current sense by next meeting

  • start working on sop for battery charging with Farris

Announcements:

  • Need to start putting together a plan for wiring up the drive train and main power system and then put it into action

    • Will hopefully be filming some video for SAR in the next couple of weeks and we want the wiring ready ahead of time to prevent delays

...

Task

Discussion Questions

Answers

Assigned To

  •  Get the bare minimum electrical systems working for the drive train to be able to move

  • What is the bare minimum electrical system?

  • What are all the all the ways we can achieve this?

  • New requirements--Need to power:

    • Jetson - 17V, 10W-30W

    • Gimbal

      • Search up nominal voltage and current draw for gimbal motor

      • Zed2: 380mA @5V

    • Vector Nav - 5V, 250 mA

    • Anenna - 24V 1.5A

    • Pi - 5V 3A

    • What are the power requirements for each of these?

  • Encoders need 5V, mostly a current ref

    • 20mA per encoder

    • 48-5V buck

  • 48V to each motor

  • Apparently the Odrive supplies 5V to the encoders so no need for a buck

Total SAR Power Requirments

  •  17V - 4A
  •  5V - 380 + 250 + 3A => 4A
  •  24V - 1.5A

Rayaan

  •  Validate the OTS BMS

  • How can this be done?

  • How easy of a project is this?

  • 3/5 tough

  • Use resistors divider board to validate basic functions

    • For checking over-voltage?

    • Hook up the cells to the BMS and test basic functions

  • Someone has definitely done battery emulation before

    • google it

Farris Matar (starting next week)

  •  Create a SOP document for how to charge the LiPo battery pack

  • With vs without the BMS

  • What is the safest way?

  • What is the most convenient way?

  • Any concerns?

  • Should always charge it using a battery charger

  • Have the BMS hooked up as well

  • Connector solution

  • Put safety warnings, storage instructions etc

Yuchen Lin

  •  Complete Rev 4.1 of PDB

  • Do we have time for a work session this weekend?

  • Yes

Rishith

  •  Validate the electrical functionality of the LED matrix

  • What exactly does this consist of?

  • What needs to be done to verify?

  • Send a digital signal to the neopixels, bitshifts

  • Just need to hit it with PWM to set the colour of the whole thing

    • arduino town

David Choi / Rishith

/ Farris Matar

  •  Set up 2.4 Ghz bands

  • working on instability issue

    • Should be fine with one antena

David Choi

...

Project

Currently Assigned To

Ticket

Due Date

Comments

Priority Level

PDB

Rishith Bomman /

Farris Matar / Rayaan

PDB Rev4 - Design and Assemble the PDB

  • Performance testing complete

  • Some small schematic and footprint issues across the board

  • 17V performed well except on start up

  • 5V is very noisey

HIGH

BMS

Joshua Harper / Ari Wasch / Olivia

BMS - Design and Assemble the BMS

  • One BMS has been assembled

  • Basic non-performacne and non-firmware tests have been done

  • An off the shelf replacement is being sourced

HIGH

Comms

Yuchen Lin / Logan Hartford

Comms

HIGH

Science

Science - Assemble & Test

MEDIUM

SPI LVDS

Farris Matar

SPI LVDS - Assemble and Test

  • SPI LVDS Host boards should have been assembled

  • SPI LVDS Peripheral parts and boards should be in the bay now, pending assembly

  • Harnesses need to be ordered in order to wire them up together and do testing

MEDIUM

RS422

David Choi / Farris Matar

RS422 - Assemble and Test

  • Farris Matar verified the design and was able to send data using the boards

  • 3 Boards have been assembled and tested

MEDIUM

LED Matrix

LED Matrix 2022/23

  • LED matrix has been located

  • Should work, just needs power and a PWM signal

MEDIUM

Digital Display Current Sense Board

Olivia Markham (Deactivated) / David Choi / Yuchen Lin

Current Sense Display

  • Currently in the schematic design phase of the project

LOW