def Start(self):
  import time
  import os
  import RPi.GPIO as GPIO
  import datetime

  GPIO.setmode(GPIO.BCM)
  DEBUG = 1

  os.system('clear')

  # SPI port on GPIO
  SPICLK = 18
  SPIMISO = 23
  SPICS = 25

  # set up the SPI interface pins
  GPIO.setup(SPIMISO, GPIO.IN)
  GPIO.setup(SPICLK, GPIO.OUT)
  GPIO.setup(SPICS, GPIO.OUT)

  GPIO.output(SPICS, True)
  GPIO.output(SPICS, False) # bring CS low
  while True:
        adcout = 0
        read_adc = 0
        #s=time.clock()
        for i in range(25):
            GPIO.output(SPICLK, True)
            GPIO.output(SPICLK, False)
            adcout <<= 1
            if (GPIO.input(SPIMISO)==1):
                adcout |= 0x1
        time.sleep(0.085)
        if (GPIO.input(SPIMISO)==0):
            read_adc = adcout
            millivolts = read_adc * ( 2500.0 /(pow(2,22)))
            read_adc = "%d" % read_adc
            millivolts = "%d" % millivolts

        if DEBUG:
            print millivolts, "mV (ADC)"

from guiLoop import guiLoop, stopLoop
# ... means fill in your code
class ...:
    started = False

    def Start(self):
        if not self.started:
            # you can also use threads here, see the first link
            self.started = self.StartLoop()

    def Stop(self):
        if self.started:
            stopLoop(self.started)
            self.started = False

    @guiLoop
    def StartLoop(self):
        # This is your Start function
        # ...
        while True:
            # ...
            yield 0.085 # time.sleep(0.085) equivalent
            # ...

from PyQt4 import QtGui
import sys

from guiLoop import guiLoop # https://gist.github.com/niccokunzmann/8673951

@guiLoop
def led_blink(argument):
    while 1:
        print("LED on " + argument)
        yield 0.5 # time to wait
        print("LED off " + argument)
        yield 0.5

app = QtGui.QApplication(sys.argv)

w = QtGui.QWidget()
w.resize(250, 150)
w.move(300, 300)
w.setWindowTitle('Simple')
w.show()

led_blink(w, 'shiny!')

sys.exit(app.exec_())

def Start(self):
    if not self.started:
        self.started = True
        self.StartLoop()

  def Stop(self):
    if self.started:
        self.started = False

  def StartLoop(self):
    DEBUG = 1
    while self.started:
        print "LED on "
        time.sleep(0.05)
        print "LED off "
        time.sleep(0.085)
        QtGui.qApp.processEvents()