Week 3 Update

Over the past week the group has made a large amount of progress regarding out design. So far we have acquired all the parts to our circuit board, the accelerometer, and the Data Acquisition board. We have ordered the sensors and the mask, which are the only two components that we don't have yet. Everything has been soldered onto our circuit board, but connections have not been made yet. We are going to wait until the next lab section to make sure that all connections are made properly. The program that tracks the accelerometer's movement in MatLab, which is being made by Michael, is close to being completed while other group members are looking for a way to be able to log this data. All of the members are still conducting research on a wide variety of topics such as the different forms of sleep, how accurately we can track the different states, and how to use Matlab to track this data.

The preliminary circuit board. At this point everything but the grounding is connected. 

The schematic for the amplifier circuit

The group was given a very specific way to build the circuit board pictured above using the schematic also pictured above. The signal from each of the electrode leads connected to the user's face will be passed through a resistor-capacitor high-pass filter. This high-pass filter will be used to reduce the noise of the outputted signal. There will also be one resistor connected to each side of the amplifier which sets the gain of the signal to 5000x (there is a typo in the schematic).


Edit: My apologies for getting this post out late, it was written on 4/19/13 but I somehow hit save as draft instead of publish.