User manual

2.4.1 RTC - set system time
Setting the real time clock in the Marvin robot is initiated by pressing the “Set RTC” button. This completes
the setting of the clock.
Hint: The time now also continues with Marvin switched off for several months. The
battery is recharged by switching on the robot.
2.4.2 Calibration of the 3D compass
The procedure for calibrating the 3D compass is described below. The alignment to NWSE
is automatically detected. A key must only be pressed or a command executed to start/stop.
Hint: The references to the sky direction facilitate a complete calibration - but are not
absolutely necessary. It is important to go through a complete circle!
2.4.2.1 Step 1 - preparation
Turn on the Marvin robot and connect the robot to the web interface in the browser. Take a compass and
determine the directions for north, east, south and west - remember the points.
Hint: You can skip this step if no compass is availble. Important is to cover the full
circle.
2.4.2.2 Step 2 - calibration mode on
Go to the remote control and display page and click the button “Calibrate compass”.
In the picture you see the imaginary axes related to the Marvin. The x-axis is red, the y-axis is green and the
z-axis is blue. Yellow is the inclination vector whose angle is not exactly known and depends on the location
on the earth. If the inclination vector and the x-axis are on a line then it can expected to be the maximum of
the measured value. This is necessary for a good calibration.
2.4.2.3 Step 3 - process
• Hold the robot to the north and tilt it upwards by 90 ° and then down.
• Hold the robot approximately horizontally to the north and tilt it 90 ° to the left and then to the right.
AREXX Engineering & JM³ Engineering
Version: 1.2.3
March 26, 2017 Page: 14