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====== salzamt, linz, 11. 09. 2012 ======


airodump-ng is scanning the wifi

this code parses the .csv file airodump is writing to and uses the value of '#IV's or the amount of data packets to send positional values to linear actuators.

<code python>
import subprocess, glob, time, csv
from arduino import Arduino, Servo

# scanning part -----------------

# airodump-ng is running and logging the results into a csv file
# subprocess looks for the last edited csv file in current folder
# this file is parsed by the csv module to find the number of data packets that have passed through the network since the last check

 
listlasted=subprocess.Popen("ls -ct1 *csv | head -1", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
lasted=listlasted.communicate()[0].strip()

# reading the scan log from a csv file

def lookup(dump):
    scan=open(dump)
    next(scan)
    scanDict=csv.DictReader(scan, delimiter=',')
    for adict in scanDict:
         if adict.has_key(' # IV'):
            data=adict.get(' # IV')
            return data

#airodump='/home/selena/doc/synergia/sator/scanning/salzamt1109-01.csv'

# moving part -------------------

portz=glob.glob("/dev/ttyUSB*")[0]
#print portz

my_board=Arduino(portz)
my_board.output([9, 11])
linearone=my_board.attachServo(9)
lineartwo=my_board.attachServo(11)

position=40
linearone.write(position), lineartwo.write(position)
time.sleep(1)

packets=int(lookup(lasted))
print 'packets', packets
time.sleep(10)

while True:
    newPackets=int(lookup(airodump))
    packetsDiff=newPackets-packets
    print 'packetsDiff', packetsDiff
    # decide whether to stretch or shrink: 
    if packetsDiff>10:
        newPosition=position+(packetsDiff/5)
        print 'should stretch', newPosition
        if newPosition <=140:
            print 'and will do'
            linearone.write(newPosition), lineartwo.write(newPosition)
        else:
            print 'already at maximum'
            # reset
            position=120
    elif packetsDiff<=0:
        newPosition=position-10
        print 'shrinking', newPosition
        if newPosition >= 40:
            print 'will do'
            linearone.write(newPosition), lineartwo.write(newPosition)
        else:
            print 'already at minumum'
            position=50
    time.sleep(5)
    packets=newPackets #resets the packets
    position=newPosition #resets the position (so the next time it will compare with the updated value)

</code>
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