Vehicle Counting with IR Sensor

#!/usr/bin/env python
import time
import pifacedigitalio as pio

def piotrigger():
    print '... Started on %s.' % time.strftime('%c')
    count = 0
    trucks = 0
    fname = time.strftime('trucks_%d%m%Y.log')

    pio.init()
    while True:
        if pio.digital_read(0) == 1:
            if count == 0:
                pio.digital_write(2, 1)

            count += 1
            if count == 1000:
                trucks += 1
                pio.digital_write(3, 1)
                print 'Number of trucks:', trucks
                with open(fname, 'w') as truckfile:
                    truckfile.write('%d\n' % trucks)

        elif count > 0:
            pio.digital_write(2, 0)
            pio.digital_write(3, 0)
            count = 0

        time.sleep(0.01)

piotrigger()