Return logged magnetic field data from iOS sensor
[log, timestamp] = magfieldlog(m)
This example assumes that you have already installed and set up MATLAB® Mobile™ on your iOS device and connected it to your computer running MATLAB. For information about these steps, see Get Started with iOS Sensors (MATLAB Mobile for iOS).
Start MATLAB Mobile on your iOS device.
On the Sensors screen, tap the Magnetic Field sensor.
Place the device where you want to get the sensor data.
On your computer, create a
m, in MATLAB.
m = mobiledev
Begin logging data by enabling the
m.Logging = 1
This action starts the transmitting of data from all selected sensors. You can also start transmission by tapping the Start button in MATLAB Mobile.
Get the logged magnetic field data.
[mf, t] = magfieldlog(m)
This returns the magnetic field log, where
contains the three data points in
Z coordinates, in
See Device Orientation (MATLAB Mobile for iOS) for a diagram showing the
Z axes relative to
log— Name of variable for magnetic field log data
Name of variable for magnetic field log data, returned as an [mx3]
matrix of data points from the Magnetic Field sensor on the iOS
device. The three data points are the magnetic field reading in
Z coordinates, in microtesla.
Magnetic field is defined in relation to the
Z axes. If you place
the device face-up on a table, the positive X-axis extends out of
the right side of the device, positive Y-axis extends out of the top
side, and the positive Z-axis extends out of the front face of the
device. This is independent of the orientation of the device.
timestamp— Name of variable for timestamp
Name of variable for timestamp, returned as an [mx1] vector of
timestamps from the Magnetic Field sensor on the iOS device. Time is
in seconds, relative to the