add documentation and data file

slip-ring-test/readme.org

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+* TODO Register data on the computer

slip-ring-test/run_test.m

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+tg = slrt;
+
+%% TODO - Build this application if updated
+
+%%
+if tg.Connected == "Yes"
+    if tg.Status == "stopped"
+        %% Load the application
+        tg.load('test');
+
+        %% Run the application
+        tg.start;
+        pause(10);
+        tg.stop;
+        
+        %% Load the data
+        f = SimulinkRealTime.openFTP(tg);
+        mget(f, 'data/data_001.dat');
+        close(f);
+    end
+end
+
+%% Convert the Data
+data = SimulinkRealTime.utils.getFileScopeData('data/data_001.dat').data;
+
+t  = data(:, end);
+x1 = data(:, 1);
+x2 = data(:, 2);
+
+save('mat/data_001.mat', 't', 'x1', 'x2');
+
+%% Plot the data
+figure;
+hold on;
+plot(t, x1);
+plot(t, x2);
+hold off
+xlabel('Time [s]');
+ylabel('Voltage [V]');
+
+%% Compute the PSD
+dt = t(2)-t(1);
+
+window_L = ceil(length(x1)/10);
+window_han = .5*(1 - cos(2*pi*(1:window_L)'/(window_L+1)));
+
+[pxx, f] = pwelch(x1, window_han, 0, [], 1/dt);
+