Bewis Sensing Technology LLC www.bwsensing.com Tel：+86 18921292620
SEC380
Inclination compensation
3D electronic compass
Calibration
We strongly recommend to calibrate the magnetic field after the installation is complete
and after each change in the magnetic field environment. After the calibration is completed
according to the method in the manual, the firmware and program in SEC380 can effectively
eliminate the interference of the magnetic field after calibration. As long as the position of the
compass and the surrounding magnetic field environment do not change, there is no need to
compensate the sensor.
The test shows that if the user performs the calibration operation in accordance with the
requirements of the user manual, the compass can meet the above requirements when
installing, and the sensor is calibrated correctly, the heading accuracy of the sensor will be less
than 0.5 degrees (RMS). Our recommended test method is to install the SEC380 sensor
horizontally on a non-magnetic material away from the interference to measure the heading
angle. Please avoid additional magnetic field interference during the measurement.
The electronic compass has been calibrated in the factory. In places where the magnetic field
environment has little influence, there is no need to perform environmental calibration during
use, and it can be used directly. In actual use, it is recommended to calibrate.
Azimuth calibration steps:
Plane calibration:
1.
Connect the product to the system and place the product in a horizontal state;
2.
Open the serial debugging assistant and send 77 04 00 11 15;
3.
Rotate the product in the horizontal plane (both pitch and roll angles are within ±5°) around
the z-axis (z-axis is the vertical direction), and rotate 2-3 times. The rotation process should be
as slow and close as possible Rotate at a constant speed, and the time for one revolution is
controlled between 10 seconds and 15 seconds;
4.
Rotate the compass around the X-axis or Y-axis. The rotation process can be slow and nearly
uniform. It rotates 2-3 times around each axis, and the time for one rotation is about 15
seconds;
5.
After completing the calibration, send 77 04 00 12 16 to save the calibration.
Multi-faceted calibration
1.
Fix the electronic compass in the use environment, and try not to carry magnetic objects
such as keys and mobile phones during calibration;
2.
Place the compass in a horizontal state (within ±5°);
3.
Send the following calibration command in hexadecimal format: 77 04 00 08 0C, the return
value is 77 05 00 88 00 8D;
4.
The product is placed in a horizontal state, the front is facing upwards (both pitch and roll
are within ±5°), the myopia rotates one circle at a constant speed, and it takes more than 10
seconds to rotate one circle;
5.
The product is placed on the screen with the installation side facing up (both pitch and roll
are within ±5°), and the myopia rotates at a constant speed, and it takes more than 10 seconds
to rotate once;
6.
The product is placed in a vertical position, with the smooth side of the shell facing down
(both pitch and roll are within ±5°), and the myopia rotates one circle at a constant speed, and
it takes more than 10 seconds to rotate one circle;
7.
The product is placed in a vertical state, the other smooth side of the shell faces downwards
(both pitch and roll are within ±5°), and the myopia rotates at a constant speed, and it takes
more than 10 seconds to rotate once; among them, 4, 5, 6, 7 Steps can be exchanged;
8.
After the four faces are rotated, send the hexadecimal command 77 04 00 09 0D to save the
calibration and return to 77 05 00 89 XX YY. Where XX represents the calibration error
coefficient, the smaller the value, the better, less than 1 is ideal, FF represents the calibration
failure, YY is the checksum of the command;
9.
The calibration is complete.
