temp_readings.py

#!/usr/bin/python

# Copyright (c) 2014 Adafruit Industries
# Author: Tony DiCola

# 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 Adafruit_DHT
import requests
import time

# Sensor should be set to Adafruit_DHT.DHT11,
# Adafruit_DHT.DHT22, or Adafruit_DHT.AM2302.
sensor = Adafruit_DHT.DHT22

# Example using a Beaglebone Black with DHT sensor
# connected to pin P8_11.
#pin = 'P8_11'

# Example using a Raspberry Pi with DHT sensor
# connected to GPIO23.
pin = 4

# Try to grab a sensor reading.  Use the read_retry method which will retry up
# to 15 times to get a sensor reading (waiting 2 seconds between each retry).
humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)

#Convert the temp to F
temperature = 9.0/5.0 * temperature + 32

#Round the temp
#temperature = str(round(temperature, 1))

#Current timestamp
timestamp = time.time()

# Note that sometimes you won't get a reading and
# the results will be null (because Linux can't
# guarantee the timing of calls to read the sensor).  
# If this happens try again!
if humidity is not None and temperature is not None:
	#Write the data to the database
	#data = 'server_stack_temp,host=rpi1,location=basement value=' + str(temperature) + ' ' + str(timestamp)
	data = 'server_stack_temp,host=rpi1,location=basement value=' + str(temperature)
	print data
	output = requests.post('http://192.168.9.42:8086/write?db=home', data=data)
	print output
	data = 'server_stack_humidity,host=rpi1,location=basement value=' + str(humidity)
	print data
	output = requests.post('http://192.168.9.42:8086/write?db=home', data=data)
	print output
	
	#Output the data to the screen
	print 'Temp={0:0.1f}*F  Humidity={1:0.1f}%'.format(temperature, humidity)
else:
	print 'Failed to get reading. Try again!'