DS18B20_single_PROC.py

import os
import glob
import time
import sys
from PyQt5 import QtWidgets, uic

os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')

base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

app = QtWidgets.QApplication([])
ui = uic.loadUi("therm_monitor.ui")
ui.setWindowTitle("DS18B20")

def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close
    return lines

def read_temp():
    lines = read_temp_raw()
    while lines[0].strip()[-3:]!='YES':
        time.sleep(0.2)
        lines = read_lines_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
        temp_f = temp_c*9.0/5.0+32.0
        return temp_c, temp_f
ui.show()
app.exec()

try:
    while True:
        print(read_temp())
    time.sleep(1)
except KeyboardInterrupt:
    print('exeting')