Customer Handoff & Final Project Documentation
Table of Contents
Team Vision for Final Demo and HandoffFor the final phase of our project, our team goal was to address the last few issues with our design and to make improvements based on feedback from our integrated system review. These activities included creating a cron script for automatic start up, displaying force and location data on a user friendly device, using a more robust switch to power on the system, and to modify the packaging to make it more user friendly, aesthetically pleasing, and secure. At the conclusion of this phase, we have accomplished a functioning cron script to automate system start-up, force and location data displayed in real time on a desktop or laptop, and a new packaging layout that incorporates a new switch, an ethernet port for force sensor replacement, and access to the micro USB port for system charging. This robust device satisfies our customer requirements by displaying real-time force and location data of an individual's footsteps wirelessly while providing minimal interference with the individuals natural gait and lifestyle.
Final Project StatusSystem Schematics
Test Results Summary
Location Measurements and Accuracy
System measured location at several known points within a 2.58 m x 5.58 m space. The DWM module output was compared against the known coordinates, and it was found that the DWM measured location with an average accuracy of 2.83 cm, with a maximum deviation of 15 cm at one point. There was significant noise in these measurements, but the average value measured at each point increases the accuracy significantly.
Force Measurements and Accuracy
System measured up to 220 lbs ± 5 while system was fully configured and the A301 force sensor was integrated into a shoe insert (Left). Up to 500 lbs of direct force was measured by the force sensors in a laboratory setting (Right).
Data Processing and Wireless Transmission
Data from the force sensor, DWM location module, and accelerometer was sent in real-time via bluetooth from the raspberry pi to a laptop or desktop. This data was recorded anywhere from 3-10 samples per second and can be changed as needed.
System Size and Weight
Our final packaging has dimensions of 3.25" x 1.5" x 5.5" and weighs just under 7.2 ounces, which satisfies our 9 ounce maximum weight requirement.
Risk and Problem TrackingRisk Management
Final Project DocumentationFinal Paper and Poster
Instructions and User Guides
Our User Guide contains instructions on Assembly, Start-Up & Use, and Software Set-up and Requirements.
Recommendations for Future Work
Our recommended future work for this project includes the following.
- Adjust the layout and wiring of components to optimize the packaging and make the system as lightweight as possible.
- Remove the accelerometer from the design and use the DWM alone for location measurements.
- Improve the packaging material to make it more aesthetically pleasing, ergonomic, and comfortable for the user.
- Consider using a different micro controller (ex: Arduino) as opposed to a micro computer (ex: Raspberry Pi) to obtain more accurate data readings at a faster sampling rate with a lower power draw.
- Optimize the data display for different applications so the user (physician, therapist, researcher, patient etc.) can interpret the data in a meaningful way.
Plans for Wrap-upThe following items still need to be addressed in the next week. All team members will work together to complete these items.
- Lightning Talk Slide. (12/3)
- Attachment of ethernet port to PCB for the force sensor attachment. (12/5)
- Technical Paper final edits and submission. (12/5)
- Lightning Talk Presentation. (12/5)
- Workspace clean-up. (12/5)
- Final Gate Review. (12/6)