#!/usr/bin/python
# Copyright (c) 2014 Adafruit Industries
# Author: Tony DiCola
# Modified by Vitor Henrique

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import sys
import Adafruit_DHT
import os
import glob
import time


# Parse command line parameters.
sensor_args = { '11': Adafruit_DHT.DHT11,
				'22': Adafruit_DHT.DHT22,
				'2302': Adafruit_DHT.AM2302 }

if len(sys.argv) == 3 and sys.argv[1] in sensor_args:
	sensor = sensor_args[sys.argv[1]]
	pin = sys.argv[2]
	isDHTSensor  = True
elif len(sys.argv) == 2 and sys.argv[1] == '1820'
	os.system('modprobe w1-gpio')
	os.system('modprobe w1-therm')
	base_dir = '/sys/bus/w1/devices/'
	device_folder = glob.glob(base_dir + '28*')[0]
	device_file = device_folder + '/w1_slave'
	isDHTSensor = False
else:
	sys.exit(1)

def read_temp_raw():
	f = open(device_file, 'r')
	lines = f.readlines()
	f.close()
	return lines
 
def read_temp():
	lines = read_temp_raw()
	while lines[0].strip()[-3:] != 'YES':
		time.sleep(0.2)
		lines = read_temp_raw()
	equals_pos = lines[1].find('t=')
	if equals_pos != -1:
		temp_string = lines[1][equals_pos+2:]
		temp_c = float(temp_string) / 1000.0
		return temp_c

def read_dht_temp():
	hum, temp = Adafruit_DHT.read_retry(sensor, pin)
	return temp

if isDHTSensor = True:
	temperature = read_dht_temp()
	if temperature is not None:
		print '{0:0.1f}'.format(temperature)
	else:
		print 'Failed'
		sys.exit(1)
else
	temperature = read_temp()
	print '{0:0.1f}'.format(temperature)
	sys.exit(1)