Attendees

1. @David Burnett

2. @Joshua Alexander

3. @Fil Maksimovic

4. @Alfonso Cortés

5. @Mina Rady

6. @Andrew Fearing

7. @Kristofer PISTER

8. @Alex Moreno

9. @Austin Patel

Minutes

• @David Burnett Submitted paper to ISCAS2022

• @Fil Maksimovic

  • Got SCuM to talk to nRF while nRF is running a BSP function

  • Is received by nRF but packet contents need debugging; could be bitwise interpretation issues

  • nRF is clearly receiving a packet from SCuM though

  • Getting things working with OpenWSN 2.0 w/ cmake; BSP radio functions seem to build correctly

  • Suggestions for testing Sulu board by Berkeley team:

    • Power consumption

    • Logic analyzer set to 19200 baud connected to SCuM’s UART output

    • BSP is expected to work fine for more complex tests. BSP is not currently integrated into SCuM programmer code; needs to be merged (should be simple).

  • @Kristofer PISTER Maybe simpler in the short term to use nRF for programming and OpenMote to test RF communication

  • @Austin Patel to supply OpenMote code (add link here please)

  • Clock calibration is done through the nRF

  • Current programming method involves holding VDDD at 1V for debugging simplicity

  • Local bond house quote £2000, looking around for alternatives

• @Andrew Fearing 2 sulu boards, optically programmable, seem to be working

  • Both boards use DCDC converters but are missing 1 inductor on each board so tests were undertaken using external 1.8v supply

  • Measured current using “allgpiotoggle”

  • Current consumption after tap differs because due testing is at 1.5v whereas PCB testing was done at 1.8v.

  • Increased current when VDDIO=VBAT instead of 0 could be due to GPIO output signals on by default and driving PCB traces, etc.

• @Mina Rady suggests using his UART relay functions

• @Joshua Alexander Updates on SCuM/nRF communication

  • Transfer of scum programmer firmware to nRF suffers from random disconnections

  • Next want to verify nRF programming works at 1.1v? 1.8v?

  • Verify optical programming works at expected VDD values

  • Test UART, IMU, DCDC (once L soldered on); need schedule and responsibility division between @Joshua Alexander and @Andrew Fearing

• @Mina Rady ran 11 km link (1 hop) using two OpenMoteB at 868 MHz

  • FSK, battery powered, 50 kbps, ~60 mW consumed in TX or RX

  • OpenMote B can listen at 2.4 G and TX at 900 MHz or vice-versa