• ADCS Board Walkthrough

    • Jolie did layouts, thicker widths for power traces
    • magnetorquers interact with reaction wheels to offset the field
    • sun sensors also exist (photoresistors)
    • Also magnometers to measure magnetic field
    • Also the IMU
    • STEVE: giant laser beam from the ground, shot onto a screen (cam on satellite), it feeds us data based on what attitude alignment we need on that - payload connector?
    • other physical cpt is laser and camera on the payload side, they just recieve values
    • J1 = 3 motor ICs and their outputs - for reaction wheels, two outputs for each motor
    • We will need to do a lot of mech integration to fit all of these parts
    • ^mag board
    • VN100 also connected here - this is their IMU
    • Harwin connector for VN 100, all pins are broken out to the OBC

  • Magnetorquer Board Walkthrough

  • Special design decisions

    • Fin and Rin control motor direction, directions from OBC

  • What went well?

  • What didn’t go well/tasks for fixing it?

    • Adding an MCU?
    • IC testing needs to be done bc reaction wheels changed - fawnhouser ones to comp - do they turn
    • want to do 6 sun sensors on each side - maybe cut a hole in the solar panel??
    • No testing done, continuity tests, turns on.

  • research into cps for magnetorquer (who is managing this?) and what cps are needed, maybe need current sensors, filters to reduce noise - needs to be fleshed out more - this is step 1

  • we then need to migrate IMU off the board- connector is already on the board - VN100 should go onto its own board and put additional M80 connector onto the OBC - more like a payload connector board

  • MCU on the board: offset processing power to maintain reaction wheels (functioning as a speed controller), sam doesn’t see much worth here, he doesnt see speciifcally complex algorithms for this - no speed or torque controller or guidance algos “preemptive optimization” - would need direct access to each sensor, actuators, commands from OBC - OBC probably has tons of interrupts to deal with? be prepped for intermediate processing power- matrix math

  • Just the sun sensors need to be added, whatever mech produces

  • Improvement ideas

    • sun sensors got dropped
    • mech might build reaction wheels

  • What needs to be purchased to complete the boards?

    • part choices were complicated-joel can link
    • no sun sensors currently
    • no magnetorquers
    • only have the IMU currently

  • How much documentation already exists within our team about this design?

    • in progress, will be able to read it, but ping sam

  • Where are the datasheets and research materials used located?

  • Anything else about the boards we should know?

    • mech needs to produce reaction wheels
    • there is a taskboard? sam says dont look at it
    • redesign shouldn’t be necessary for this

  • All the proper ways to control things, data access needs be working

  • FW integration will be the biggest challenge

  • Yet to run all simulations with components

  • Simulation running in the fall term

  • Interface with the sensors early on. - VN-100 & Sun sensors to model stuff - this is our big to do- esp bc we can do this without needing confirmation from firmware on the MCU problem

  • also sun sensor research