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 poster Difficulties none Activities Team Member Cullen Rotroff Prakash Rao Andrew Eley Joe Hippensteel Activities Time Friday meeting 1 5 work on electrodes 3 5 Friday meeting 1 5 Pspice simulations planning 3 5 Friday meeting 1 5 Pspice simulations planning 4 0 Friday meeting 1 5 work on electrodes 3 5 5 00 5 00 5 50 Total Expenses Product Quantity supplier price 5 00 20 50 Project Schedule Task 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 manufacturing 8 September 15 22 29 6 October 13 20 25 27 3 November 10 17 24 1 December 8 13 15
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