Embedded Motion Control 2015/FAQ

When you ran into a problem, try to find the solution here first. If it's not here, try to find an answer by googling your problem, asking fellow students, or, as a very last resort, ask your tutor! If you found a solution, please put it here such that others can use it! Try to be as consise yet descriptive as possible, and try to file your Problem-Solution pair under the correct category (or add a new category if necessary).

Example

Just as an example! Please remove this section if you're the first to add a Problem-Solution pair!

My computer is on fire. Is this a bad thing?

Nah, probably not, the fire will soon die out. Be sure though to commit all your changes to the SVN! Just in case...

Ubuntu

My laptop is stuck on maximum brightness

Open your Terminal. Type

sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf

A text editor will open. Add the following content

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"
EndSection

Log out and back in. You can now use the brightness controls on your keyboard to change the brightness.

C++

Everything related to the programming language

SVN

Everything related to Subversion

PICO

What are the constraints on the maximum velocity of PICO ?

0.5 m/s lateral and 1.2 rad/s rotational.

What is approximately the width of the corridor ?

1 meter it may be 0.5 to 1.5 as a result of human error.

How many requestOpenDoor()'s may we use?

As many as you want and need. According to the rules it is not even forbidden to constantly ring it.

QT Creator

My program is not building and running within Qt Creator

When building the program does not work in QT creator, but does work in the terminal, the following may fix the problem.

When your project is open, click 'Projects' on the left task bar. Scroll down to 'Build Environment', and expand it (click Details). Now, all the way to the bottom right, click 'Batch Edit'.

Next, open your terminal (ctrl+alt+t), and type

   printenv

Select the entire output (you probably only need a few relevant variables, but I can be bothered to check which), and copy (ctrl+shift+c). Paste the entire output in your QT creator Batch Edit window, and click OK. Building with CTRL+B should work now!