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ds18b20.py
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ds18b20.py
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import os
import glob
import time
class DS18B20:
__device_file = ""
def __init__(self):
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
search = glob.glob(base_dir + '28*')
if len(search) != 0:
device_folder = search[0]
self.__device_file = device_folder + '/w1_slave'
def _read_temp_raw(self):
if self.__device_file == "":
return ""
f = open(self.__device_file, 'r')
lines = f.readlines()
f.close()
return lines
def get_temp(self):
lines = self._read_temp_raw()
if lines == "":
return 99.9
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = self._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 get_ui_temp(self):
return "%.1f" % self.get_temp()