Last week, the contractors built-up the front wall of the basement and the final Moo (#13) was placed at the ninth course. This marks the end of the two-month deployment process! The placement of the Moos on the front wall can be found here: https://docs.google.com/a/umich.edu/drawings/d/1q02Q3-czy8DOJkogW27gtXUN2Q1CBVJklI0ARvrMgCk/edit
Remarks on the Front Wall Deployment
- All Moos on front wall were placed with the signal antenna poking as far as possible into an empty cell.
- Tin foil was used inside the empty cells to help aid backscattering of the signal on all Moos on the front wall.
- Able to successfully read from the tested Moos on the front wall (#5 and #29) with max rate of 5 tags/sec.
- repositioned the reader to read from Moo #29 instead of Moo #25 on the side wall (stopped responding when additional blocks were laid).
Picture of Moo #29 at third course of front wall:
- bring additional (white square) antenna on-site so that we can collect from more of the newly placed Moos.
- analyze current Moo data more thoroughly (Denis).
Re-flowing (Reviving) Non-working Moos in the lab
After testing the nonworking Moos from the lab, I was able to diagnose why some of them were not working. I noticed that some of the Moos behaved better when adding a little pressure on certain parts of the circuit. For example, some of the components did not seem to be completely seated on the PCB board and likely not fully connected. I re-soldered the components in question and was able to get seven additional Moos working.
Observations from Tests
- some Moos only work when JTAG is plugged in for power. Will need to re-analyze why these are not generating enough power from the charge-pump circuit.
- some Moos are able to generate 5.5V+ on Vout but still cannot communicate back to the reader.
The remainder of the week was spent writing up a 1-2 page Abstract for the ESWeek terraSwarm workshop in September. Mike and I collaborated on the submission and were able to finish two abstract submissions before the August 2nd deadline. A sample of the two papers for ESWeek can be found in the google drive under Moo/Posters_Papers.
2nd Abstract Title: An Attacker-Centric Threat Model for Actors in the Swarm
Picking up where I left off, I will try to have the Moo 2.0 schematic finished later this week so that I can start laying the new board out.