mqtt-sensord/mqtt_sensord/sensorlib/pi_sensors.py

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2019-07-09 22:01:39 +02:00
import os
import re
import Adafruit_DHT
from .base import Sensor, sensor
@sensor
class DS18B20(Sensor):
sensor_class = 'pi-ds18b20'
def __init__(self, **sensor_conf):
super(DS18B20, self).__init__(**sensor_conf)
self._sensor_id = None
if 'hw_id' in sensor_conf:
self._sensor_id = sensor_conf['hw_id']
else:
self._find_sensor()
def _find_sensor(self):
basepath = "/sys/bus/w1/devices"
for d in os.listdir(basepath):
if 'master' not in d and '-' in d and \
os.path.exists(os.path.join(basepath, d, 'w1_slave')):
self._sensor_id = d
break
else:
raise ValueError("No sensor found in filesystem")
def get_data(self):
temp = None
try:
path = "/sys/bus/w1/devices/{}/w1_slave".format(self._sensor_id)
with open(path) as f:
data = f.read()
m = re.search(r".* t=(?P<temp>\d+)$", data)
if m:
temp = int(m.group('temp')) / 1000.0
except IOError:
# log?
pass
return dict(temp=temp)
@sensor
class DHT(Sensor):
sensor_class = 'pi-dht'
def __init__(self, **sensor_conf):
super(DHT, self).__init__(**sensor_conf)
if sensor_conf['dht_type'] == 'dht11':
self._dht_type = Adafruit_DHT.DHT11
elif sensor_conf['dht_type'] == 'dht22':
self._dht_type = Adafruit_DHT.DHT22
else:
raise ValueError("Unknown DHT")
def get_data(self):
data = Adafruit_DHT.read_retry(self._dht_type, self.pin)
return dict(humidity=data[0], temp=data[1])