156B Week 7
Overview of Status of Analysis, Design, Fabrication, Tests, etc.
2 Foot pedal switches have been ordered for control of syringe and direction selection.
Majority of housing has been fabricated
Lead Screw and Motor has been purchased
Accomplishments from Previous Week
Pressure Transducer is now programmed
Housing for the syringes, motors, and Arduinos is almost finished
Lead Screw and motor has been purchased
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Calibration of the pressure transducer
Purchase a display for the pressure readout
Finish housing with a final LED configuration
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Sponsor can provide a dial manometer for us to relate the voltages from the pressure transducer to the actual fluid pressure
The current pressure transducer only has a range of 0 mmHg to 300 mmHg. However, the sponsor needs it to go up to 1000 mmHg
The sponsor is working on procuring a better transducer
Sponsor hopes to be able use the outputs of the Arduino to run a data recording program on an external labtop
This will also help in calibrating the pressure transducer
The new pedal design with one pedal to control the rate and two smaller to control the direction and syringe is adequate.
The sensitivity of the lead screw is adequate in the rough risk reduction model.
It has a pitch size of approximately 6.
Syringe holders should only utilize at least one or two LEDs
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Good hardware progress
I would like to see a number of human interface configurations CADed out
create your own mechanical housing with off-the-shelf switch
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
have the program include a "pre-shoot" to remove unwanted air bubbles
incorporate emergency off switch
consider using a torsion spring lock to hold the syringe in place rather than a swinging arm. Might be easier to swap (especially if it has a swivel)
maybe use wristwatch type devise that has direction buttons, *communicate via bluetooth?
toggle instead of step button
maybe decrease the sound of the components with insulated walls, so the patient does not hear the motors and get nervous
put in a fine mesh or filter somewhere in the tubing to brreak up bubbles
make a PCB to clean up the design
Risks and Areas of Concern
Further research has to be done on how to program the display to read out the pressure readings
Resources or Information Required but not Available
Schedule
Describe upcoming milestone
Update Gantt chart.
Budget (list amount spent and amount remaining)
Progress on Report and Webpage