Diablo - Powerful motor control for your robots!

Installation issues

  • Permission denied, file not found, 404 or similar:
    There are a few possible causes of this:
    • Out of disk space:
      We have occasionally seen this with people who have smaller SD cards, check by using
      If the Use% column reads 99 or 100% on rootfs you probably need to remove some files to free up space
    • Unable to find file / 404:
      Most likely the internet connection is down or there are problems with the command, check you are connected to the internet okay with
      ping -c4 google.co.uk
      If you get errors it is probably the connection, if not check the name is correct.
      If there is still a problem it might be an issue with the Linux repositories, try
      sudo apt-get update
      to update where on the internet the Raspberry Pi looks for packages.
    • Unable to write to the given location:
      This should not be the case (instructions use the users own folder), but try running using 'sudo'
  • E: Unable to locate package ...
    Check your internet connection is okay as above, otherwise try
    sudo apt-get update
    to update where on the internet the Raspberry Pi looks for packages.
  • PiBorg logo is missing from the desktop (text is there):
    sometimes the desktop refresh is a bit temperamental, try restarting the Raspberry Pi.

Use issues

  • My motor spins when I am not running any code
    The most likely cause for this is a wiring problem, double check all the connections as shown on the Getting Started tab.
  • My motor runs backwards
    Swap the M+ and M- connections for the given motor at the Diablo terminals.
  • My motor does not work
    Check you are not seeing any errors displayed when calling Init() and the jumper is connected across the two pin EPO / safety switch connector.
    Now run the following:
    import Diablo
    DIABLO = Diablo.Diablo()
    print DIABLO.GetEpo()
    If this prints True then the board thinks the jumper is not attached / the safety switch has tripped and is refusing to allow the motors to move, this can be resolved by either fitting the jumper or adding the following line before the ResetEpo() call:
    If it still does not work try all of the above again followed by:
    print DIABLO.GetDriveFault()
    If this prints True then the board is reporting a fault, see the GetDriveFault returns True below.
    Otherwise the most likely cause for this is a wiring problem, double check all the connections as shown on the Getting Started tab.
  • GetDriveFault returns True
    Faults may indicate power problems, such as under-voltage (not enough power), and may be cleared by setting a lower drive power
    If a fault is persistent, it repeatably occurs when trying to control the board, this may indicate a wiring problem such as:
    • The supply is not powerful enough for the motors
      The board has a bare minimum requirement of 6V to operate correctly
      A recommended minimum supply of 7.2V should be sufficient for smaller motors
    • The + and - connections for either motor are connected to each other
    • Either + or - is connected to ground (GND, also known as 0V or earth)
    • Either + or - is connected to the power supply (V+, directly to the battery or power pack)
    • One of the motors may be damaged

    Faults will self-clear, they do not need to be reset, however some faults require both motors to be moving at less than 100% to clear
    The easiest way to check is to put both motors at a low power setting which is high enough for them to rotate easily, such as 30%
    Note that the fault state may be true at power up, this is normal and should clear when both motors have been driven
    If there are no faults but you cannot make your motors move check GetEpo to see if the safety switch has been tripped
    For more details on correct wiring check the Getting Started tab and double check the wiring instructions

  • Permission denied
    It is likely that the user you are currently logged in with does not have permission to use the I²C driver, try running the same command with sudo, e.g.
    sudo python
    If that resolves the issue then you can add the user to the i2c group with:
    sudo adduser username i2c
  • _tkinter.TclError: no display name and no $DISPLAY environment variable
    You are running a graphical program on a text only terminal (such as SSH), you need to run from a graphical environment.
  • I get the error Diablo was not found
    You should see the boards I²C address if you run the following from Python:
    import Diablo
    If no boards are found check that the Diablo is attached correctly as shown on the Getting Started tab.
    If a board is shown then set the I²C address to the shown value before calling Init(), e.g.
    import Diablo
    DIABLO = Diablo.Diablo()
    DIABLO.i2cAddress = 0x44
  • Python says it cannot find the Diablo module
    make sure you have the Diablo.py file in the same folder you are in, e.g.
    cd ~/diablo
    If you still have problems you can manually add the correct folder to the Python search path:
    import sys
    import Diablo
  • I get the error pygame.error: video system not initialized
    There was a mistake in some of our example scripts which can prevent pygame working properly.
    This has been fixed and you can re-install the Diablo software to update them using these commands:
    cd ~
    rm -rf diablo
    bash <(curl https://www.piborg.org/install-diablo.txt)
    Alternatively you can add the line highlighted below into the pygame setup section using a text editor:
    	# Setup pygame
    	os.environ["SDL_VIDEODRIVER"] = "dummy" # Removes ...
    	joystick = pygame.joystick.Joystick(0)
  • I get the error pygame.error: Unable to open a console terminal
    For some reason pygame is unable to access the dummy screen driver.
    Try running the script using sudo or logging in as root and running the script.
  • I am trying to use Python 3 / WebIOPi, help...
    See Diablo and Python 3 for more help setting up with Python 3

In the event that you cannot solve your problem, please post here for further assistance.

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