text: 
  uno= Board('/dev/cu.wchusbserial1420')
  
  stepper = Stepper(pins=[8,10,9,11], steps=2100, speed=15)
  
  stepperViewer= ExdViewerBox(target=stepper)
  APP.STACK.add_widget(stepperViewer)
  
  control = ExdSliderBox(minv=0, maxv=2100, target=stepper, value="pos")
  APP.STACK.add_widget(control)
  