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import os
import glob
import time
#
# Based, in large part, on https://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing?view=all
#
class TempSensorController:
def __init__(self, sensorIndex):
self.sensorIndex = sensorIndex
print("Initializing Temperature Sensor")
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
time.sleep(2)
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[self.sensorIndex]
self.device_file = device_folder + '/w1_slave'
def _readTempRaw(self):
f = open(self.device_file, 'r')
lines = f.readlines()
f.close()
return lines
def readTemp(self):
lines = self._readTempRaw()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = self._readTempRaw()
equals_pos = lines[1].find('t=')
if equals_pos == -1:
raise Exception("invalid temp reading")
else:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string) / 1000.0
temp_f = temp_c * 9.0 / 5.0 + 32.0
print(" Temp Reading: {}C, {}F".format(temp_c, temp_f))
return temp_c, temp_f
def teardown(self):
pass