This week brings good news and very bad news, the good news is that the code actually works. We edited to code to show a hyponogram of the users sleep cycle. The thresholds aren't exact as everyone's movement while sleeping can vary by a degree. The bad news is that we cannot get the device to amplify our eye movement accurately due to the 60Hz interference that are generated by the alternating current in wall sockets. The device will work well if there is no outside interfenrence, but a place to sleep with no interference is hard to find. We also realized that tracking sleep cycles can get really tricky with EOG and accelerometers as N2 and N3 sleep are very similar with respect to eye and muscle movement.
We spent a lot of time this week talking about what we would chance about the project if we had more time. The main thing that we would change is to entirely redesign the circuit board. At the moment the combination of the circuit board and the DAQ is very awkward to have to sleep with. We also want to move from MATLAB to a mobile device such as an Android or iOS phone to act as the data acquisition unit along with a replacement for MATLAB. The electrodes also had a difficult time staying attached all night with alligator clips attached to them, we found snap connector electrodes that are also reusable. The last thing that we would want to do is acquire a polysomnograph to form more accurate thresholds for the different forms of sleep.
