Progress Report #10: EEG Biofeedback System BME 400 November 9, 2006 – November 16, 2006 Client: Daniel Muller, MD, PhD Team Members: Cullen Rotroff (Leader/Communicator) Prakash Rao (Leader/Communicator) Joe Hippensteel (BSAC) Andrew Eley (BWIG) Problem Statement The goal of our project is to design and build an inexpensive, portable electroencephalogram (EEG - brain wave monitor) that teaches meditation practitioners to achieve optimal meditation by indicating the presence of EEG alpha and theta waves. This shall be achieved through a relatively inexpensive, minimally distracting, and potentially portable device intended for commercial use. Last Week’s Goals • Begin bread board assembly of bio-amplifier • Complete and test first Active electrode • If active electrodes and bio-amplifier work as expected begin planning implementation of design, otherwise, back to the drawing board. Summary of Team Accomplishments • Consulted with Prof. Webster on some of the minute details of running a simulation of our amplifier/filters. Specifically, we discussed the following aspects of our schematic: 1. We need to limit the gain of the instrumentation amplifier to 25. We then follow the instrumentation amplifer with another amplifier with more gain. We can then introduce additional gain in our filtering stages as well. In totality, all of the stages of the circuit can contribute to a gain of ~10,000. 2. Need to ac couple the amplifer stage to block the dc. Otherwise, we might amplify the small amount of offset that might develop at the electrodes. • Cullen and Joe continued working on the active electrode testing. Specifically, they tested the behavior of the some of the micro-amplifiers they were able to obtain (samples from a company) This Week’s Goals • Since we probably will limited time next week due to the Thanksgiving holidays, we hope to have all aspects of our design finalized before then so that after the break, we can put everything together (which we anticipate to take a day or two), and spend the rest of the semester on testing/aesthetics. • If needed, order any other pertinent parts (amplifier chips, etc.). • Reconsider the situation with the budget (if there is a situation) • Start planning for the paper/posterDifficulties none Activities Team Member Activities Time Cullen Rotroff Friday meeting (1.5), work on electrodes (3.5) 5.00 Prakash Rao Friday meeting (1.5), Pspice simulations/planning (3.5) 5.00 Andrew Eley Friday meeting (1.5), Pspice simulations/planning (4.0) 5.50 Joe Hippensteel Friday meeting (1.5), work on electrodes (3.5) 5.00 Total 20.50 Expenses Product Quantity supplier priceProject Schedule September October November December Task 8 15 22 29 6 13 20 25 27 3 10 17 24 1 8 13 15 Preliminary Designs Meeting with client circuit design literature research Friday Team meetings circuit construction Deliverables Progress Report Mid semester presentation Mid semester paper End Semester Presentation End Semester Paper Web site Semester Wrap-up with Advisor Prototyping acounting/budgeting final design developments analysis/testing final prototype
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