Thank you for the time you took for me. Your nodes are interesting so it becomes more flexibility about the password.
But if i play around in the fast preview it seems there is a litle bug in the nodes. The numbers would't hide and sometimes the position of the numbers are outside the unit.
Maybe there is a problem with the String Join Operator?

Hi everyone, sorry about my english. I'm very new here and i would like to say a great thx for the blender crew especially for the blend4web crew. You all have done a big job here and i hope you will go on .
But now to my question.
I try to build a input unit with an passcode only with node editor. For an example i build a short blender file to show you what i mean. The right number for the code is 232. At the moment there are only three buttons on the unit and i have a lot of nodes already. If i would do it with ten buttons then are much more nodes required. Is there a solution to do it much shorter?

keypass.blend