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You cannot find the documentation about the SensoriMotorLab on anymore. For documentation on the vBOT RobotLab, please visit

Some cheat sheet instructions for the sled lab:

Using the experiment control computer

The computer under the desk is called vnc. It is connected to the three screens in front of you. To run an experiment you log on to the experiment control computer (control)

ssh -X control

By default windows are opened on vnc, not on control. If you want to change this, then type on control

export DISPLAY=':0'

Starting the sled server and service

After restarting the sled server (which is practically never necessary) you also have to restart the sled service. Log on to the sled server

ssh sled

and type

sudo service sled start

This will start the standard version of the sled server.

If you want the version of the sled server with smoother sinusoid ramp-up. Please go here. This most likely not necessary for you.

Using video modes not available according to EDID

Normally the monitor tells the computer what its supported combinations of resolution and refresh rates (video modes) are. This system is called EDID. If for some reason you want to use a mode that is not in the list of EDID modes, you have to add it yourself. This is typically the case if you use an analog connections to the monitor.

Before adding a mode you have to allow it in /etc/X11/xorg.conf (this file may not exist yet), the crux is in the line containing AllowNonEdidModes:

Section "Monitor"
   Identifier     "Monitor0"
   VendorName     "Unknown"
   ModelName      "Idek Iiyama HM903DADTA"
   HorizSync       30.0 - 133.0
   VertRefresh     50.0 - 200.0
   Option         "DPMS"
Section "Device"
   Identifier     "Device0"
   Driver         "nvidia"
   VendorName     "NVIDIA Corporation"
   BoardName      "GeForce GTX 770"
   Option         "ModeValidation" "AllowNonEdidModes"

To add a 144 Hz 1024x768 mode do the following:

xrandr --newmode "1024x768_144.00"  169.30  1024 1104 1216 1408  768 769 772 835  -HSync +Vsync
xrandr --addmode DVI-I-0 1024x768_144.00
xrandr --output DVI-I-0 --mode 1024x768_144.00

Mounting the Radboud file system

Personal folder

  1. Open the file manager, either the default (dolphin) or the other one (nautilus).
  2. Type: