Python script extending the Adafruit DHTxx Sensor tutorial and sends the humidity and temperature data to a Graphite server.

dht_monitor.py

import argparse
import serial
import string
import time
import os, sys
from socket import socket

CARBON_SERVER = '192.168.3.27'
CARBON_PORT = 2003

DEFAULT_SERIAL="/dev/ttyACM0"
DEFAULT_PREFIX="garage.1"


parser = argparse.ArgumentParser()
parser.add_argument('--serial', help='Serial device to read data')
parser.add_argument('--prefix', help='String prefix used for metric key')

args = parser.parse_args()
if args.serial is None:
  serial_port = DEFAULT_SERIAL 
else:
  serial_port = args.serial 

if args.prefix is None:
  prefix = DEFAULT_PREFIX
else:
  prefix = args.prefix


print serial_port
print prefix

ser = serial.Serial(serial_port, 9600)

sock = socket()
try:
    sock.connect( (CARBON_SERVER,CARBON_PORT) )
except:
    print "Couldn't connect to carbon server %(server)s :: %(port)d." % { 'server':CARBON_SERVER, 'port':CARBON_PORT }
    sys.exit(1)

while 1:
    msg = []
    line = ser.readline()
    now = int (time.time() )
    print line
    if len(line.split()) >= 3:
      cols = line.split()
      print cols
      msg.append("%s.humidity %s %d" % (prefix, cols[1], now))
      msg.append("%s.temp %s %d" % (prefix, cols[4], now))
      message = '\n'.join(msg) + '\n'
      print '-' * 80
      print message
      print
      sock.sendall(message)