Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Currently, we are down-selecting on several component options and are in process of validation of those components. For the battery side of the device, analysis is ongoing on power requirements and spatial constraints given the BOM. The schematic for current injection, multiplexing, current measurement, and ADC implementation has been created and is being constantly updated to the plan of record. Components from down-selection have been ordered and are en-route for validation testing.
Accomplishments from Previous Week
Completed risk reduction presentation and have ordered new multiplexers and current sources as a result of the conclusions.
Ordered all components for main PCB to validate prior to layout (fully vet the schematic). These parts include: ADC, 32 node multiplexers, current shunt sensor, shunt resistors, current sources, current source switching ICs, and adapters for SMT to DIP interfaces.
Down-selected and ordered microcontroller (Beagleboard Black)
Started schematic in Autodesk Eagle which will ultimately become a subsidiary PCB.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Solder multiplexes to adapters and assess performance (Aaron)
Solder current sources to adapters and validate accuracy (Jacob)
Determine mAh and voltage requirements based on Ken’s battery life guidance (Matthew)
Purchase microcontroller and begin code for validation testing (Max)
Update schematic and start first pass routing (Team)
Create presentation for initial design proposal (Team)
Component analysis done and uploaded (Team)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
No actionable comments other than logistics going into spring quarter. He also commented that our risk reduction presentation looked great.
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Prof. Tustaniwskyj commented that we should ensure we are using shunt resistors for current measurements. We confirmed that we are investigating this path.
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
Excellent use of slides, very concise and aesthetic (via email 4/3)
Briefly explain the context of previous research done on the films and current applications (via email 4/3)
Make more eye contact and speak slower (via email 4/3)
Risks and Areas of Concern
Stability of the REF200 current source, and the ability to add these sources together to create larger currents.
PCB layout crosstalk issues, desense, etc. (will need to consult EE on layout)
Resources or Information Required but not Available
Battery life of device (will talk to Ken)
Schedule
Wednesday, 4/4/18: Meeting with Ken
Friday, 4/6/18: All parts should arrive for validation
Wednesday, 4/11/18: Design proposal presentation
Budget (list amount spent and amount remaining)
Amount spent: $247.61
Amount Remaining: $1152.39
Progress on Report and Webpage
Report will be started in the coming 1-2 weeks
Webpage updated to current information with appropriate component documents.