Cheap as Chips Chappy Checker

#!/usr/bin/python
#
import CHIP_IO.GPIO as GPIO
import time
LED = "CSID0"
GPIO_PIR = "XIO-P0" (From the HC-SR501 Output pin.)
print "HC-SR501 Human Sensor test (press ctrl-C to quit)."
# Set LED pin as output
GPIO.setup(LED, GPIO.OUT)
GPIO.output(LED, GPIO.LOW)
# Set PIR pin as input
GPIO.setup(GPIO_PIR, GPIO.IN)
Current_State  = 0
Previous_State = 0
try:
 print "Waiting for PIR to settle down."
 # Loop until PIR output = LOW
 while GPIO.input(GPIO_PIR)==1:
   Current_State  = 0
 print "Scanning..."
 # Loop until user types ctrl-C
 while True :
   # Read PIR state
   Current_State = GPIO.input(GPIO_PIR)
   if Current_State==1 and Previous_State==0:
     # PIR is triggered
     print "  Human detected!"
     GPIO.output(LED, GPIO.HIGH)
     # Record previous state
     Previous_State=1
   elif Current_State==0 and Previous_State==1:
     # PIR has returned to ready state
     print "Scanning..."
     GPIO.output(LED, GPIO.LOW)
     Previous_State=0
   # Wait for 10 milliseconds
   time.sleep(0.01)
except KeyboardInterrupt:
 print "Goodbye"
 # Reset GPIO settings
 GPIO.cleanup()