Week 9: Finished Chair Assembly and Worked out DAQ Kinks

During this week of our project, the assembly of the chair and all of its part is for the most part completed. We are still continuing to work on the cod However, there were some issues with getting the DAQ to output signals that were taken from the electrodes that were placed on the skin. When we tried to obtain a signal and see the graph that was produced from it there was no graph produced. Also, instead of the line of the graph staying at 0 when no motion was being made in the neck there was some drifting in the data. The drift would occur between -10 and 10. Many different approaches were taken about how to fix this problem and get an output to come out. But, this past weekend most of these problems that we were having were solved. We were able to get signals from two of the sensors instead of getting signals from all four. To generate a strong signal the biceps of one of the group members had to be used. To solve the issue of the data drifting from -10 to 10 the sensors were placed further apart from each other and the drifting was fixed. We also modified our code to be able to see two graphs, one graph for each set of sensors, instead of just one. This could not fully be tested, but we do not see any reason why this would not work. We now need to set a threshold that when reached will send a signal to the DAQ, through the circuit, to the battery and they to the motor that will move the chair up or down. In Figure 1 below is a photograph of the final design project.

 

Figure 1: Final design of the chair.