Week 8

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

• • Analysis

    • Calculated torque necessary for stepper motor

  • Design

    • Finalizing CAD model of final prototype

      • Dimensions of structure components

      • Positions of holes

  • Fabrication

    • Modified existing prototype to create a mock up of our final one

    • Modified prototype is larger than final prototype

Accomplishments from Previous Week

• • Finished modifying our previous prototype

    • Added four panels

  • Ordered various parts

    • Stepper motors

    • Stepper motor drivers

    • Force sensing resistor

    • Accelerometer

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

• • Get temperature control working (Johnson)

  • Finish 7" x 7" mattress (Johnson, Allen, Daniel)

  • Finalize CAD of final prototype (Stephanie)

  • Work on Draft 2 of report (Johnson, Daniel, Allen, Stephanie)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

• • Fine if we provide proof of concept

  • Heater that is 6" x 6" is fine

    • Ordered another silicone rubber heater such that we have our heating source for the 6 x 6

  • If going to do scaled down mattress, have it complete

  • Looks finished

  • Not half baked

    • Going to purchase acrylic to make the mold this week

    • CADing out mold

  • Rather see a gap than have something jutting up

    • May do an inverse house for the headboard and footboard

  • Wants a circular motion for movement

    • Ordered four stepper motors

    • Modified our acrylic mock up to have four panels

  • Not sure that speaker is important

    • Very low priority

    • Focusing on structure, mattress and response

  • Temperature control

  • Wants us to get to 37 degress at a reasonable speed

  • Do not want to exceed 38 degress

    • Will try to get control working by the end of the week

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

• • Maybe the bottom piece of heater could have more insulation

    • Going to use memory foam as an insulator

  • Build a nonmotorized little plastic version with four little panels

    • Modified our large structure instead to have four panels

  • Project management

  • Create a timeline

    • Sponsor happy with our timeline

    • Fine if we do not have something that we can place a baby on right away

  • One way of managing time is using non-final material

    • Going with acrylic

  • Have one with zero motion, and one with some motion

    • Created mock up without motors attached

    • Moving on to final prototype with motion incorporated

Risks and Areas of Concern

• • Stepper motors might not have enough torque to push weight of panels and mattress

  • Not enough inputs in Arduino for all of our electronics

Resources or Information Required but not Available

• • None at the moment

Schedule

• • Describe upcoming milestone

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Neck massage and heat pad - $42.00

  • Lead Screws - $16.77

  • Accelerometer - $36.94

  • Leather - $10.93

  • LCD display - $18.94

  • Stepper Motor Driver Boards - $91.65

  • PC Board - 34.41

  • Stepper Motors - $151.07

  • Silicone Rubber Heat Strip - 42.76

  • TOTAL for the Week: = 445.47

  • REMAINING BUDGET = $925.53 - 445.47 = $480.06

Progress on Report and Webpage

• • Webpage

    • Added Week 8 Report to webpage

    • Adding more information as it becomes available for our project

  • Report

    • Expanding upon our "outline" that was Draft 1

    • Adding information under figures and graphs