#!/usr/bin/python
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#-*- coding:utf-8 -*-
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import glob
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import time
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base_dir = '/sys/bus/w1/devices/'
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device_folder = glob.glob(base_dir + '28*')[0]
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device_file = device_folder + '/w1_slave'
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def read_rom():
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name_file=device_folder+'/name'
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f = open(name_file,'r')
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return f.readline()
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def read_temp_raw():
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f = open(device_file, 'r')
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lines = f.readlines()
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f.close()
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return lines
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def read_temp():
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lines = read_temp_raw()
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while lines[0].strip()[-3:] != 'YES':
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time.sleep(0.2)
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lines = read_temp_raw()
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equals_pos = lines[1].find('t=')
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if equals_pos != -1:
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temp_string = lines[1][equals_pos+2:]
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temp_c = float(temp_string) / 1000.0
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return temp_c
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print(' DS19B20 get temperature: %3.3f ℃'% read_temp())
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