#! /usr/bin/env python
# Read the output of an Arduino which is constantly printing sensor output.
# See also
# http://www.arcfn.com/2009/06/arduino-sheevaplug-cool-hardware.html
import sys, os, time, serial
class Arduino() :
def loop(self, verbose) :
# Port may vary, so look for it:
baseport = "/dev/ttyUSB"
self.ser = None
for i in xrange(0, 9) :
try :
self.ser = serial.Serial(baseport + str(i), 9600, timeout=10)
break
except :
self.ser = None
pass
if not self.ser :
print "Couldn't open a serial port"
sys.exit(1)
print "Opened /dev/ttyUSB" + str(i)
while True :
print "Sleeping ..."
time.sleep(2)
self.ser.flushInput()
data = self.ser.readline().strip()
if not data :
continue
print "data str = '" + data + "'"
data = int(data)
print "data int =", data
if verbose :
print data
if data < 45 :
if verbose :
print "Snapping photo!"
os.system("fswebcam --device /dev/video0 -S 1 output.jpg")
#os.system('fswebcam --device /dev/video0 -s "Exposure, Auto"=4 -D 1.5 output.jpg')
webfile = open("arduino.html", "w")
print >>webfile, """
Proximity webcam
Proximity webcam
%s
""" % data
webfile.close()
# If -v, run in verbose mode
if len (sys.argv) > 1 and sys.argv[1] == '-v' :
verbose = True
else :
# For the demo, just always make it true. In real life, set to False.
verbose = True
arduino = Arduino()
arduino.loop(verbose)