Integrated System Build & Test with Customer Demo
Table of Contents
Team Vision for System Level Demo with Customer
Phase IV Plan: During this phase, the team planned to finalize each subsystem. On the mechanical side, we planned to put finishing details on the bottom casing and create a 1st iteration of the upper casing to completely encapsulate the device. We also planned to finalize the attachment method of the device to the hand. On the software side, the team planned to fix the LED issue as well as revise the Arduino code to make the typing more accurate. The team has continually been working on the poster and paper during this phase as well as the hand-off documentation for the customer.
Phase IV Accomplishments: The team was successful in modifying the bottom casing and creating an upper casing, despite issues with access to 3-D printing. The attachment method was also finalized. For the software side, we fixed the LED issue and added in a "shift" mode to incorporate an alternate keyboard. The team was also able to improve the typing accuracy from the last review. A new and easier to read layout of the typing scheme was also created to help make typing easier.
Test Results Summary
|Owner||Test||Ideal Value||Marginal Value||Phase III Result||Phase IV Update||Comments|
|Emmanuel||S17: Steps to Take On/Off||Less than 6||8||There are 5 steps needed to put the device on. The steps are done in reverse order (and opposite action) when being taken off.1. Loosen finger loops and hand/wrist straps. 2. Place device on back of hand. 3. Insert thumb and fingers through appropriate loops. 4. Tie hand/wrist straps to hold device in place. on back of hand. 5. Adjust finger loops to desired level of tension.||Same number of steps required.||No change|
|Nicole||S21: Adjustable||Binary: Yes||N/A||Yes||Yes||Device fits all team members and currently has plenty of room to be adjusted for larger hands.|
|Carolyn & Jackie||S6: Finger Flexion||Less than 90 degrees||Less than 100 degrees||15-30 degrees||N/A||Further testing will be done to determine the range that is used by each team member depending on the tension that is most comfortable to each member.|
|Emmanuel||S18: Confined to hand/wrist*||Less than 4" past wrist||Less than 5" past wrist||Does not go past wrist.||Does not go past wrist.||Confined to wrist and hand. Meets desired value.|
|Emmanuel||S19: Protrudes less than 1" from hand||Less than 1"||Less than 1.5"||Protrudes 5/8" off of the hand.||Protrudes 3/4" off of the hand.||Meets the desired value.|
|Arshia||S20: Weight of Device||Less than 1 lb||Less than 1.5 lbs||.225 lbs||.335 lbs||This only includes the two boards, but we are on track to meet weight requirement.|
|Nick||S10: Lag Time||<100mS||<200mS||min: 408mS mean: 437.6mS max: 488mS||N/A||These delays include a 400mS delay purposely added to make sure all the switches the user is trying to press are activated before the character is read. The actual delay from once the user inputs a character to when it is sent to the Bluetooth module is much smaller.|
Mechanical SubsystemFor the mechanical side, our goal was to create a fully encapsulated casing. We discussed ideas with hinges and other locking mechanisms, but decided to create a part that slid on. We extended the front part of the "bottom casing" to cover the components in the front of the PCB board, including the switches. We then created a smaller piece that slid onto a track in the "bottom casing", while including holes for both the LED and power button to ensure access. We also added a slight curve on the bottom of the casing to aid in the comfort of the casing.
Electrical SubsystemSince the last review the issue with the LED was fixed and updates were made to the software to add more functionality (and user feedback) to the device. The shift function was implemented with a blue LED used to let the user know when it is on, as well as an alternate keyboard with a green LED used to let the user know when it is on. Other characters like the backspace and enter were also added in.
User Learning GuideIn working with our graphic designer (Rachel Manhardt), we have been able to create a learning guide for the user so they will better understand how to use the device. The three images below are examples of what the final product will look like.
Letters will be grouped together based off of frequency of use, or ease of access. Once those letters are grouped together, we will be able to indicate what each letter is within that group. For example: AEIOU, YW, NLTS, GX, Numbers, Switch-Delete-Send-Space-Enter.
Bill of Materials
- Finalized BOM
- Added item numbers for recommended parts from handoff (yellow)
- Updated quantities to reflect parts received
- Color Scheme
- Green: Current
- Yellow: Recommended part replacement
- Red: Deprecated (no longer used)
- Blue: Backup Part
- White: Misc. / Uncategorized
- Orange: Safety
Click here for the working document.
Risk and Problem Tracking
- Risks can be found here.
- A link to the full problem tracker document can be found here.
Plans for next phase
For the working document click here.
Individual Plans for Phase V