Help with reading/writing an Android to Matlab G-Force program (Android Sensors)

Hello, I am currently working on a uni project but I am having a bit of a problem. I am looking for just a x co-ordinate rotational acceleration vs time and angular velocity (on the x axis, not yaw) program. I have created a drone that rotates and I want to receive the data back to matlab. Here's what I have so far. Any tips are great. For some reason the time frames that appear on the graph go to 200 (s) when I pause for 15 s.

connector on yourpassword;

m = mobiledev;

m.AccelerationSensorEnabled = 1;

m.AngularVelocitySensorEnabled = 1;

m.Logging = 1;

pause (10)

m.Logging = 0;

[a, t] = accellog(m);

x = a(:,1);

y = a(:,2);

z = a(:,3);

%plot(t, av);

% Calculate and plot magnitude acceleration

mag = sqrt(sum(x.^2 + y.^2 + z.^2, 2));

figure

plot(t, mag);

xlabel('Time (s)');

ylabel('Acceleration (m/s^2)');

disp (mag)

Answer 1

[Prashant Arora]

Hi Anthony,

This might be happening due to the fact that when using "accelog", MATLAB will give you data from all logs after it established a connection, and not just the last run. To start fresh each time you run a script, you can use the following command:

 discardlogs(m);

Hope this helps!

[Andy Keane]

Hey Preshant, that worked! Thanks!