156B Week 3
Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Circuit complete but scrappy.
thermistors and their voltage dividers up and returning accurate temperature readings
Code is complete, bar controller tuning.
successfully disables when motion sensor triggers
maintains a good feedback loop for ambient temperature of 30 degrees C
Also returns an unverified feedback loop for a ramp heating of 1 deg/sec for the test
Glass is here, requires housing.
Accomplishments from Previous Week
Power supply, rocker switch, additional thermistors and halogen bulbs wired to circuit.
Controller for 1 deg/sec heating coded and tested.
Thermal simulation done.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Experimentally record the relationship between location & surface temperature and bulb temperature. (Thomas)
Run test on glass using full circuit to tune the controller code(s). (Jason)
Design and make circuit box (Naif)
Draft PCB. (Inri)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
On the topic of needing different motion detectors: still waiting on a shipment of an analog motion sensor to hopefully making a system with lower sensitivity.
Next meeting Thursday 4-19-18. They are bringing a consultant to confirm or improve our design.
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Worked with Greg in person to make thermal simulation more accurate. Simulation is still shaky, will require a comparison with experimental data.
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
We should look at ultrasonic motion sensors again despite online research suggesting the critical distance was too large.
Risks and Areas of Concern
Method of temperature measurement still unconfirmed. Data has been acquired from past tests by the sponsor. We will compare to our own to check tolerances on different measurement types.
Resources or Information Required but not Available
Steve Roberts and the components he offered. He should be back later this week.
Schedule
Upcoming @ end of Week 5: successful reaction test
should be able to conduct the neuropathy diagnostic test using just the glass, a basic box, and the circuit.
on track, possibly by next week.
Upcoming @ end of Week 4: design for linear slider (3D printed)
Update Gantt chart.
Budget (list amount spent and amount remaining)
Amount spent: 331$
Amount remaining: $4500 - $331=$4169
Progress on Report and Webpage
Background information and context completed in report.