The Lynxmotion SSC-32 module allows you to interface RoboRealm to servos using a controller made by Lynxmotion
called the SSC-32 Servo Controller.
The servo controller supports up to 32 channels of 1uS resolution. In addition the board provides
synchronized movement so that all servos will update at the same time. The board also supports 4 digital or analog
inputs for adding additional sensors to your robotic projects.
1. COM Port - Select the COM port that the controller is connected to on your computer. Note
that you will only see COM ports that are recognized by your computer.
2. Baud Rate - Select the appropriate baud rate. Note that 115200 is the default and should not
be changed unless required. For instance, if you are using the controller board through a wireless
connection you may need to slow down the connection speed due to the wireless hardware
limitations. Be sure to also change the jumpers on the Lynxmotion SSC to reflect the
3. Checkbox - To enable/disable a particular servo channel select the checkbox to change its state. When disabled
the servo will not be sent any further position commands.
4. Scroll Bars - After specifying the COM port and speed you should be able to move your servos by dragging the
sliders to the right or left or by specifying a
number within the current value text box in the Servo Config area. If the servos do not move
check your COM port setting and/or board connections. You should see a small green light flash on the
Lynxmotion SSC board when any serial communication is present. If you do not see this
light flashing when moving the scroll bar around check your connections. If you do see a flashing
light with no movement check the channel you plugged the servo into.
5. Variable - Select an appropriate variable that contains or will contain the position
value that will be sent to the
servo board. This is used to automatically change the servo values based on your
VBScript (using the SetVariable function) or Plugin based program.
6. Min/Max Limits - You can use the min/max limits to ensure that even if the variables specify
large or low values (due to programming errors)
that the board does not actually attempt to move the servos above or below
the specified limits. This can be used
as an additional precaution in case your servos cannot physically move beyond
7. Rate - specify the speed at which your servos should move at. Note that once a new value
is sent to the board the old position and speed will be overwritten.
8. Bank # - Select the appropriate bank of servos that you would like to configure. Note the channel number which
corresponds to the channel number of the Lynxmotion SSC board. Only eight channels are visible at any time.
9. Inputs - select which type of input you wish to receive. Digital will set a one or zero.
Analog will set a number between 0 and 255 depending on the voltage across the pins. By selecting
or typing in a variable next to the appropriate input channel you can access that variable's
value in other modules such as the VBScript or Write_Variables modules.
10. Press STOP if you need to quickly disable all the servos and return them to the
middle or neutral (1500) position.
Note that if you set a servo channel to be positioned using a variable's value you will lose manual control
over that servo. Changing the variable value, however, will change that servo's position.
The Lynxmotion SSC has servo position feedback information that is used to update the RoboRealm servo
variable (if specified) based
on where the servo currently is. As the servo rate can be changed the servo may not immediately adjust
its position to the final destination but slowly move towards it. During this movement the servo
variable within RoboRealm will be updated to reflect the current position of the servo. This can be used
in successive VBScript or If_statement modules to change the behavior of the servo prior to completing
the full move. Thus be aware that after the Lynxmotion_SSC module the servo variables may not have
exact the values specified before the module is executed.
to load a configuration to move a servo in response to movement in front of the camera. Click on the
previous link. This should run RoboRealm and start processing images. Be sure that the camera button is pressed and
you have a webcam attached to your computer. If you see a black screen check the Options button and select
an active camera in the dropdown list.
Ensure that the Lynxmotion servo controller board is connected to the computer. If
you are using a different COM port than COM1 double click on the Lynxmotion_SSC module in the main
RoboRealm dialog and change the COM setting in the interface that appears. Press ok to close the dialog.
Try waving your hand in front of the camera. Notice the green COG box tracking your hand. The servo should
also move in one direction and in the other when you move your hand back. Note that when you stop moving
your hand the picture disappears and the servo remains stable.
Click on each of the modules to see how we accomplished this task.
For more information
Lynxmotion SSC-32 Servo Controller
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