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How do I visualise sensor data in MATLAB Online from iPhone app
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Hi,
I'm looking to experiment and visually oberve the behaviour of phone sensors (accelerometer etc)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/488083/image.png)
I've managed to stream the data to MATLAB but I'm unsure how to visualise this. Could someone kindly help?
Thank you,
Jeremy
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Answers (1)
Suraj
on 18 Jul 2024
Hi Jeremy,
It looks like you were succesful in collecting sensor data and you'd like to plot it on MATLAB. I've come up with a script that plots accelerometer data collected from my phone live.
% Start acquiring data from "mobiledev" object "m"
m.Logging = 1;
pause(0.1);
% Figure for live plot
figure;
hX = animatedline('MaximumNumPoints', 100, 'Color', 'r');
hY = animatedline('MaximumNumPoints', 100, 'Color', 'g');
hZ = animatedline('MaximumNumPoints', 100, 'Color', 'b');
legend('accX', 'accY', 'accZ');
ax = gca;
ax.YGrid = 'on';
ax.YLim = [-20 20]; % Adjust according to your expected range
% Initialize time vector for x-axis
timeVec = [];
% Loop for live plotting while data is being collected
while m.Logging == 1
% Read acceleration data
[a, t] = accellog(m);
% If new data is available
if ~isempty(a)
% Append new data to the time vector
timeVec = [timeVec; t];
% Update the plot for each axis
addpoints(hX, t, a(:, 1)); % X-axis acceleration
addpoints(hY, t, a(:, 2)); % Y-axis acceleration
addpoints(hZ, t, a(:, 3)); % Z-axis acceleration
% Update the x-axis limits to focus on last 2 seconds' data
ax.XLim = [max(timeVec) - 2, max(timeVec)];
drawnow;
end
% Pause to control the update rate
pause(0.1);
end
% Stop logging
m.Logging = 0;
Here's a screenshot of the figure that I was able to plot:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1736577/image.png)
I hope this helps !
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