Attending

• @Kristofer PISTER

• @Felipe Campos

• @Meera Lester

• @Jove Yuan

• @Titan Yuan

• @Ahad Rauf

• @Alex Moreno

• @Thomas Watteyne [remote]

• @Tengfei Chang [remote]

Action Items

Minutes

• @Kristofer PISTER

  • Brian was able to get sweeping going

  • update about flex PCB: 3C, 377 battery clip, chip antenna. What other boards do people need?

  • calibration: 2 orthogonal axes of progress:

    • 1) understanding/implementing the best way of doing spectrum analyzer-free calibration

    • 2) doing something simple/practical to get demos working.

    • For now, keep thinking about 1, but focus on 2. let’s get a temp sensor demo

  • Lydia and Alex are trying to get more dev boards

  • what would you want?

  • SCuM and zappy2, we should be able to bond them to get them running with one sun illumination

  • get chatty on the ML

  • test program that exercises everything in the chip

    • just writing 1’s and 0’s to memory, and see if problem

    • because of the loopback capability, we could do stuff with the GPIOs

    • test program should run on any chip

  • send ideas for boards to ML

• @Felipe Campos battery-less SCuM

  • LDO regulators

  • discussion about mechanical coil oscillation

  • discussion about having someone from EE140 to design support chips for SCuM

  • @Kristofer PISTER : send ideas about support chips to ML

  • next steps: send packets

  • 2mm x 2mm printed, at C/20 discharge 120 uAh, starts at 4V, drops down to 3V. A student could turn the 3-4V . 1-2h of lifetime,

  • 50 uA / MHz is the Cortex

  • 260/310 uA is what we measure, 3.3 MHz, bringing down the uC speed would shave off 150 uA

  • optical receiver is running now

  • discussion about how cost of sending beacons

• @Meera Lester

  • questions for Lydia

  • use ADC to confirm sine wave input

  • @Kristofer PISTER : please use ML

  • SCuM interrupts are level sensitive, if you don’t disable the GPIOs, it keeps firing

• @Jove Yuan optical programmer upgrade

  • ordered high-power LEDs, will arrive later this week

  • using laser to do optical calibration, successful programming disables optical calibration

  • is something in the code disabling

  • discussion about hello world application, believe works with IR LED

  • analysis of the behavior of bootload.py , analysis of a calibration packet, 500/500/2/2 are cycles in Brad’s code. Laser does transmit the right thing, unclear what happens. The optical receiver receives the bits correctly.

• @Thomas Watteyne

  • presents update about Jenkins integration

  • @Kristofer PISTER : should we standardize an IE which contains the frequency error?