I repeated the experiment with the whip antenna in the lab. Position 1 corresponds to “head of bed”, position 2 corresponds to “foot of bed”, position 3 corresponds to “middle of room”, and position 4 corresponds to “doorway”.
This graph is a little better than the graphs we had before. There is still a huge variance in some locations.
The CDF looks much better than the one from the hospital data- there is more of a separation between the positions. However- there is an inversion between positions 1 & 2. This could be old messages appearing when I was at position 1.
I thought these problems could be caused by the clock, so I also made plots of RSSI vs. Time to see if there was a cycle.
For the most part, there seemed to be cycling, especially near the beginning. But near the end, the data gets a little fuzzy. There are some odd sharp points though. This could mean both problems with the clock or problems with the signals.
I think we should look for more pronounced cycling & hopefully get a mote time interface to solve some of our problems. I’m not sure what we could do about the jagged points though.