Hey David,
I understand that you’re trying to collect and display sensor data using MATLAB mobile by following the steps mentioned in “Stream Sensor Data with MATLAB Object Properties”.
The reason that you’re seeing empty values for "InitialTimestamp" and other sensor data is probably because the first datapoint from the sensors is not yet received by “mobiledev” when the value of "m" is printed to the console.
A workaround to this is to wait for the first datapoint from the sensors to arrive and then perform your activity. Here is a code snippet that will work –
clear m % Clear any previous instances of mobiledev
m = mobiledev();
m.MagneticSensorEnabled = 1;
m.Logging = 1; % Start collecting sensor data
disp("Waiting for sensor data at: "+ string(datetime));
while(isempty(m.MagneticField)) % Wait for the first sensor readout
end
disp("Received sensor data at: "+ string(datetime));
m.Device
m.InitialTimestamp
m.MagneticField
m.Logging = 0; % Stop collecting sensor data
Hope this helps.
Regards,
Suraj.
