Examples of program for ev3dev

For python/rubiks_test.py:

• apt-get install python-pip python-dev python-numpy
• pip install colormath

• Hold down the center button for several seconds to exit the program (the LED will turn yellow). This is handy if the arm fails to flip the cube and you want to stop and start over.
• If you have a server.conf file but cannot reach the server the LED will change to orange. The color analyzer and solution program will both run on the ev3 so orange is a sign that things will run a little slower.
• If we hit an eror the LED will turn RED. Check the rubiks.log file to see what went wrong.

It is possible to run the color analyzing software and the rubiks cube solution software on the ev3 but there are two advantages in offloading this to a much faster server:

• When run on a server, the color analyzer will use a more CPU intensive algorithm and will return more reliable results.
• When run on a server, ev3dev_examples/python/pyev3/twophase_python/solve.py is used to calculate the solution. This normally returns a solution that takes about 20 steps. This is compared to a solution in the 60 to 100 steps range if you use cubex on the ev3.

To use a server create an ev3dev_examples/python/server.conf file that has the following fields

dwalton76@ev3dev[python]# cat server.conf username=dwalton76 ip=192.168.0.13 path=/home/dwalton76/ev3dev_examples/ dwalton76@ev3dev[python]#

You will need to create ssh keys so that you can login without a password http://www.thegeekstuff.com/2008/11/3-steps-to-perform-ssh-login-without-password-using-ssh-keygen-ssh-copy-id/