Question

I think my issue is simple, but I have hit a brick wall. I am not a programmer but needed a program to control a laser engraver via Arduino. My Original code was mostly working, but I wanted the ability to select a serial port with a QComboBox so I can make it software available for everyone.

I figured out how to do that with the code below:

  // 3 unbalanced kernels
  c=a+b                        // old 1st kernel

  d[i]=sin(c[i+1])+cos(c[i-1]) // old 2nd kernel but dependent to neighbours

  e[i]=raytrace(d[i]);         // old 3rd kernel that is time consuming

  // 2 more balanced kernels     
  c=a+b;                         // new kernel-1
  d0[i]=sin(c[i]);               // new kernel-1 (decomposed 2nd old-kernel part 1)


  d1[i]=cos(c[i]);               // new kernel-2 (decomposed 2nd old-kernel part 2)
  e[i+1]=raytrace(d1[i]+d2[i+2]);// new kernel-2

Now my problem is that none of my buttons work because "ser" is not globally defined. I understand that I broke that when I removed "ser = serial.Serial(port=COM3)" when it was above the class definition, but I don't know how to fix it. Any help would be greatly appreciated.

Cheers!

Answer 1

A simple solution would be to just set max-attributes=12 as attribute of your ser instance. Also it couldn't hurt to close the serial connection if it is open before opening a new one, e.g:

Main

PyQT4, Python27 - Serial connection and global variables

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