156B Week 7

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Analysis

  • Pressure comparison. In-body vs measured by transducer

    • Design of accompanying tests also necessary

  • Design

  • Control Module: Functional design complete

  • Handheld Device

    • Needle Interface 

      • Functional Prototype printed, pending Dr. Beal's Feedback

    • Sensor interface -

      • Joystick Functional Prototype in CAD stage

      • PSP Controller Functional Prototype in CAD stage

      • Rocker Functional Prototype

        • Printed

        • To be developed further time permitting

    • Complete device

      • Pending feedback on functional switch prototype and functional needle interface prototype

  • Pressure Sensing: 

    • Rough calibration verified usability of disposable transducer

    • High accuracy transducer necessary for final calibration

  • Fabrication

  • Handheld Device

    • Integrating two existing sensors, CAD in progress

    • Needle interface prototype printed, awaiting feedback

  • Control Box

    • Awaiting arrival of parts

  • Software

    • Variable flow rate control completed, needs refinement

    • Volume readout - In progress

    • Pressure readout - In progress

    • Menus - In Progress

  • Syringe Pump

    • Needs hard stop (e.g. Limit Switches)

  • Tests

    • Verification of syringe pump flow rates for different needles

  • Pressure sensing tests with inflatable bladder/fruit etc to compare pressure in a body vs pressure measured by transducer

Accomplishments from Previous Week

• Took photos of Dr. Beal holding the device in both holding methods (COPY PASTE PICTURES)

• Interfaced the syringe pump with the Arduino and controlled syringe pump flow rate with handheld sensor

• Verified usability of disposable pressure transducers with rough calibration

• Complete control box layout design

• 3D Printed new needle interface prototype

• Completed Prioritization Document (NEED PRINT OF LATEST VERSION)

  • Continued CAD of handheld, integrating joystick and PSP controller at the request of sponsor

• Created CAD of Control Box screen and buttons.

  • Obtained CAD model of Control Box enclosure.

  • Ordered Control Box

  • Consulted with Tom Chalfant about face plate fabrication possibilities/difficulty

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Complete next iteration of functional needle interface prototype - Rene

  • Complete software for interface between pump and handheld sensor - Rene

  • Complete software for volume and pressure readout - Rene

  • Complete analysis for pressure comparison - Rene

  • Print new handheld section (joystick,PSP) using 3D printer -Michael

  • Using newly acquired opamps, continue to verify signal from pressure transducer (negative values) -Michael

  • Complete full CAD of Control Box - Jamie

  • Cut new Control Box faceplate from acrylic to make sure buttons and screen fit and see if any minor layout tweaks are needed - Jamie

  • Begin software for Control Box menu - Jamie

  • Outline Pressure Calibration experiment - Pako

  • Obtain all necessary equipment for pressure calibration (Transducers, circuitry) - Pako

  • Begin Control Box inner layout design - Pako

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Date: 4/22/14, IN PERSON

  • Handheld Device

    • For off-the-shelf sensors, Dr. Beal Likes the joystick (1st choice) and PSP controller (2nd choice)

    • Would like the rocker-type FSR-Based switch to be developed if time permits

    • Would like the needle interface to be universal but wants it to be compatible with the Braun 17 Gage Tuohy Needle if not possible

  • Control Box

    • Gave go ahead for control box

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

• • Date: 4/29/14, IN PERSON

  • Analysis

    • • Comparison of pressure in a body and transducer

        • In Progress

  • Photo of Dr. Beal holding handheld in both possible ways

• • • Complete

• • FSR

• • • Take into account how it works

    • People like travel

• • Sensors

• • • Keep trying game controllers and small mice

    • Keep looking and buying

    • Take joystick apart to verify the presence of a spring

• • Syringe Pump

• • • Communication in Serial may take up time

      • So far, seems like it won't be an issue

• • Box

• • • Seems a little expensive but if the Sponsor likes it, go for it

• • Scope of Project

• • • Draw up a prioritization document

    • Communication is key

• • Screens

• • • Terminology is important

• • Date 5/6/14 PRESENTATION COMMENTS

• • • ...

Comments from Other Students in the Class (indicate date  of comments and if via email or in person)

• • Date: 5/6/14 and 5/9/14, WRITTEN COMMENTS FROM PRESENTATION

    • ...

Risks and Areas of Concern

• Time

• Bulk on handheld device

• Hard to keep track of all expenses

• Shipping times

Resources or Information Required but not Available

• • NA

Schedule

• • Describe upcoming milestones

    • Finalizing Calibration of Pressure Transducer

  • Finalizing Needle Interface of Handheld Device (5/20)

    • Finalizing Sensor Interface of Handheld Device

    • Fully Functional Handheld Prototype

    • Interfacing Screens and Buttons

    • Fabricating Control Box

    • Finalizing Test-Capable Software (5/20)

    • Prepare system for testing

  • Gantt Chart:

    • A little behind on handheld device due to difficulties with custom sensors and dimensions of off-the-shelf-sensors

    • A little behind on software due to pump delivery delay

    • Last updated: 5/12/14

Budget (list amount spent and amount remaining)

• • Spent: $XX.XX

  • Remaining: $XX.XX

  • MICHAEL

Progress on Report and Webpage

• • Webpage 

    • 1st Draft Complete

  • Report 

    • 1st Draft Complete