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+## Troubleshooting
+### 1) The LED does not work
+1) Make sure the Thorlabs LED is plugged in, turned on (turn the dial to a non-zero value) and that the switch is in the **TRIG**er position
+2) Reset the Arduino by pressing the white button on the top and restart the program
+3) Unplug and replug the Arduino and restart the program
+4) Re-upload the code (see section "Arduino Code")
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diff --git a/cpdctrl_gui/resources/user_guide.md b/cpdctrl_gui/resources/user_guide.md
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+# CPD User Guide
+## Changing the sample
+1. Stop the turbopump:
+   1. Press the stop button on the control panel
+   2. Close the valve between pump and chamber (on top of the turbo pump), by screwing it into the pump
+2. Ventilate the chamber
+   1. Open the gate valve
+   2. Carefully open the needle valve (usually less than 1/8 turn)
+   3. When the chamber can be moved, close both valves again
+3. Take off the chamber
+   1. Make some space to put the chamber (mind the grease on the bottom edge)
+   2. Carefully lift the chamber. Good places to grab it are the tubing on the left and the right bottom edge.  
+      ***Caution***: The tube connecting the chamber with the pump will exert a force to the right!  
+      **Make sure you do not crash the chamber into the sample tray!**
+4. Move the sample away from the gold mesh
+   1. Move the tray fully down by turning the upper micrometer screw *counterclockwise*
+   2. Move the tray fully to the left using the larger micrometer screw
+   3. Loosen the screw on the clamp holding the sample in place and remove the sample
+5. Prepare the new sample
+   1. Put the sample on the tray and place the clamp on it.
+   2. Tighten the clamp screw (you might need to grab the nut on the bottom side)
+   3. Move the tray in x-position using the large micrometer screw.  
+      The gold mesh should be well aligned with the sample surface 
+   4. Carefully move the tray up by turning the small micrometer screw *clockwise*.
+      Leave about half a millimeter of space between the sample and the gold mesh  
+      **Do not crash the sample into the gold mesh!**
+6. Put the chamber back on
+   1. Put the chamber back on and align it on the two posts on the bottom and right
+   2. Check the backside to make sure that no cables are sticking out
+7. Vacuum the chamber
+   1. Make sure the nitrogen venting valves are closed
+   2. **Make sure the turbopump is not spinning anymore**
+   3. When the turbopump has fully stopped, very slowly open the valve on top of the pump
+   4. Fully open the valve **TODO: hier noch irgendwelche checks?**
+   5. **Wait** until the vacuum is in the lower $10^{-2}$ range (read the value from the sensor attached to the turbopump)
+   6. Only when this target pressure is reached, turn on the turbopump (control panel on top)
+   7. Wait until the desired vacuum for measurement is reached (usually $10^{-5}$)
+      - $10^{-4}$: **TODO**
+      - $10^{-5}$: **TODO**
+      - $10^{-6}$: after 1-2 days 
+      
+      If the pressure does not drop enough: Use isopropanol to inspect for leaks
+
+## CPD Controller Calibration
+**TODO**
+
+This process is not always necessary.
+1. Set CPD Controller to Manual, Offset=Gold Work Function, Filter off (so you can see what happens immediately), Oscillator to ~2
+2. Move the micrometer screw close until a signal appears
+3. Set Automatic offset so that the output is 0V
+Calibration: Fresh graphite probe
+
+## cpdctrl-gui Software
+**TODO**