PROJECT POST #3
Project Title: Vis Hat
Project Team: Lydia, Fu, Jay, Sharon
Weekly Accomplishments:
Lydia:
- Sourced and ordered remaining materials
- Researching more about brain data analysis, how to reduce noise of data, the form the data will be in
- Researching and beginning to draft response test experiments for once the sensor/emitters are built and ready for use
- Researching more about color/form correlation to emotion and coming up with plan/ideas for visualization of data; researching source code for data visualization that could be useful
Fu:
- Researching the design, testing, working principle for project system and more papers about them.
- Working on circuit design, including photodiode circuit, emitters and wiring to Arduino Due.
Jay:
- Research: NIRS process, underlying physiology, brain physiology, parts research, methods and data processing research
- Drafting circuit design
- Drafting visualization plan
Sharon:
- Research: design of the head band, brain analysis, algorithm
- Read more papers about brain blood activity and design the algorithm
- Understand how brain react with emotion changing
Images:
The following image shows the relationship between the absorption coefficient and the wavelength and illustrates working principle about how NIR light in and out are read.
The following image shows the circuit design about the photodiode circuit, also about how emitters and photodiode are wired to the Arduino Due. We are going to measure the hemoglobin and deoxyhemoglobin, which are the modified beer lambert law we are going to use.
The following images show (1) a bluetooth-Arduino Due setup we’re planning to implement and (2) a sensor/emitter setup we’ve been researching and reading into as alternative to a previous set up. Our result could be a combination of the two (previous one pictured in Project Post #2).
Material List
| title/link | # needed | price/unit | notes | shipping and tax | TOTAL PRICE: |
| arduino due | 1 | 34.43 | 34.43 | ||
| NPN transistor | 1 | 5.99 | this one unit contains ~200 resistors | 5.99 | |
| 730nm emitter | 2 | 8.61 | 9.54 | 26.76 | |
| 850nm emitter | 2 | 1.46 | 2.92 | ||
| 850 max nir detector/sensor | 2 | 5.37 | 9.02 | 19.76 | |
| bluetooth | 1 | 28.95 | RN41XVC (with chip antenna) | 8.81 | 37.76 |
Areas of Concern:
Some areas of concern have to do with the data we will be dealing with. Because we have yet to gather any data and a large portion of the project involves data analysis/clean-up, it’s hard to plan for possible obstacles in advance. Essentially, we will only be able to truly begin the software development stage once we understand further the state of the information we will receive from our sensor/emitter setup and once this data collection process has begun. Because this isn’t something to which we quite have access yet, reaching out for help would also not be the most beneficial at this time. However, once we gather some initial data in the early testing process, it would be beneficial to meet with someone (i.e. a professor possibly) experienced in brain data analysis. We’ve reached out to Professor Barry Vanveen, who has experience with this and who is willing to help us out when we reach this stage in the project.