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Weekly Updates

Member

Main Project

Status

Update

Action Items

Ari Wasch

BMS

⛔

David Choi

DD Current Sense / Comms

✅🚹

Comms research updates?

  • Still on comms research

  • Mech is more high priority

  • Looked into BLDC motor drive

    • ESC isn’t that hard

    • OTS IC, can prototype with Arduino first

  • Look more into the BLDC motor driver thing

  • Comms is good enough for right

Logan Hartford

Lead

✅

Rayaan

5V OTS

Logan Hartford

Lead

✅

Melissa Jacobs

5V Buck

✅🚹

  • Still working through the training

  • Continue working through training

Rayaan

17V Buck

✅

Any update on getting started with the DD current sense board?

  • Still researching bucks

  • Will start looking into parts this weekend and using WeBench

Rishith Bomman

PDB

✅🚹

Any updates on PDB Rev 4.1?

Wolfgang Windholtz (Deactivated)

Science / Support

✅

Yuchen Lin

DD Current Sense / Comms

✅

Any update on the DD Current Sense schematic? Any update on SOP documents?

  • Looked into some altium curriculumWorked on dd current sense

  • Worked on architecture document

  • Reach out to friend who uses WeBench

  • SOP

Brainstorming Session:

What do we HAVE to do by comp

What do we want to do by the end of term

What would be the most fun to work on

  • Rewire the drivetrain

  • Wire the Arm

  • Wire science mechanism

  • Operational power consumption estimation for all major subsystems

    • Drivetrain

    • Arm

    • Science

  • wiring--need to consult with mech

  • All encompassing architecture diagram -Billy

  • Design buck converters - Billy, Rayyan

    • Talk to Rishith

    • WeBench

  • BLDC Motor controller - David

  • Meetings

    • Bucks

    • Architecture

  • Similar to what an FTDI chip does but in a circuit

    • Need to identify a use case for this

      • RS422 ↔︎ SPI to unify the comms

    • Should try and use a single comms protocol

  • Making our own router

  • New LED matrix board

    • Multiplexed

    • Firmware project

  • Create layers for common IC/s components

...

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