questo è /etc/systemd/system/dht22.service
Codice: Seleziona tutto
[Unit]
Description=dht22
[Service]
Type=oneshot
ExecStart=/usr/local/bin/dht22.sh 22 4 6
[Install]
WantedBy=multi-user.target
questo /usr/local/bin/dht22.sh
Codice: Seleziona tutto
#!/bin/sh
DATA="$(ADHT_metern.py $1 $2 $3)"
#echo $DATA
if [ x"$DATA" != x ] && [ "$DATA" != "ERROR" ]; then
echo $DATA | cut -f 1 –d\ > /run/shm/metern$3.txt
echo $DATA | cut -f 2 –d\ >> /run/shm/metern$3.txt
fi
e questo /usr/local/bin/ADHT_metern.py
Codice: Seleziona tutto
#!/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 sys
import Adafruit_DHT
# Parse command line parameters.
sensor_args = { '11': Adafruit_DHT.DHT11,
'22': Adafruit_DHT.DHT22,
'2302': Adafruit_DHT.AM2302 }
if len(sys.argv) == 4 and sys.argv[1] in sensor_args:
sensor = sensor_args[sys.argv[1]]
pin = sys.argv[2]
id = sys.argv[3]
else:
print 'usage: sudo ./Adafruit_DHT.py [11|22|2302] GPIOpin# metern_id'
print 'example: sudo ./Adafruit_DHT.py 2302 4 8 - Read from an AM2302 connected to GPIO #4 and metern id 8'
sys.exit(1)
# 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)
# 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:
print '{0}_1({1:0.1f}*C)'.format(id, temperature)
print '{0}_2({1:0.1f}*%)'.format(id, humidity)
else:
print 'ERROR'
sys.exit(1)