Post date: Feb 21, 2010 10:41:09 PM
Yu
Mike
Nick
Fiona
*Human Subject
-Posted flyers at the Engineering building and Johnson Center
-Sent email response to the volunteers (2 appointments for the coming week)
*PCB
-Finished the Schematic for the Pen Design (Diagram)
-Have been working on the Layout design.
Current problem: connect all the components within 2 layers (Eagle's auto-routing feature does not help )
Topics that we discussed at the meeting:
1) Communication between Java GUI (PC) and Micro-controller unit (MCU): We are able to get MCU talks to PC, but not from PC to MCU yet. Once, these 2 ways communication work, we won't need potentiometer in the pen; all the settings can be done in PC. Also, we will be able to test the MCU's performance with the pre-recorded signal.
2) We recently collect hand's movement signals from Human Subject testing. We notice that the sawtooth pattern does not appear as consistent as when our group member did our experiments. Our signals can be found at: http://sites.google.com/site/seniordesignprogress/programming/matlab/accel_signals. There are false alarms occurring when we try both methods of detecting hand moving motion which are Constant False Alarm Rate and First Derivative. After analyzing a few sets of signal, we believe the Constant False Alarm Rate works better. We've also been researching different methods to detect reading motion more effectively such as cross-correlation and Euclidean distance.
3) Question was asked: do we need more sensors, for example rolling ball? => we would prefer not to since our original plan is to create a user friendly device. However, in the worst scenario, we might.