I am trying to log the pressure of a vacuum chamber over long durations. I wrote a script that uses GUIDE, timer, and the serial interface to log the pressure at 100 Hz.
In GUIDE, I create the following timer:
handles.t = timer('ExecutionMode','fixedRate','Period',0.1,'TimerFcn',{'updatePlot_fcn', hObject});
In updatePlot_fcn, I query the serial interface for the pressure data, format the data, plot the data to screen, and place it in a log file.
I found that in the first 24 hours, all my data are recorded (i.e. 10 data points every second). By the second day, I am only logging 7 or 8 data points every second. By the third day, I log on average 2 or 3 data points every second.
I tried the script on several different computer (with > 16GB memory), they all exhibit this problem. I don't know if it is a Matlab memory leak issue (Matlab does not draw additional memory according to task manager), a timer issue, or something wrong that I am doing with the code.
