#!/usr/bin/env python

import epics
import time

# config
darkPV = epics.PV('SLAAR03-LTIM-PDLY:DARKSHOT.PROC')
normalPV = epics.PV('SLAAR03-LTIM-PDLY:NORMAL.PROC')

while True:
    time.sleep(20)
    darkPV.put(1)
    print('dark')
    time.sleep(20)
    normalPV.put(1)
    print('light')