temp_log.py

import os, glob, time, datetime

log_period = 10 # seconds

logging_folder = glob.glob('/media/*')[0]
dt = datetime.datetime.now()
file_name = "temp_log_{:%Y_%m_%d}.csv".format(dt)
logging_file = logging_folder + '/' + file_name

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'
 
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_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
        temp_f = temp_c * 9.0 / 5.0 + 32.0
        return temp_c, temp_f

def log_temp():
    temp_c, temp_f = read_temp()
    dt = datetime.datetime.now()
    f = open(logging_file, 'a')
    f.write('\n"{:%H:%M:%S}",'.format(dt))
    f.write(str(temp_c))
    f.close()
	
print("Logging to: " + logging_file)
while True:
    log_temp()
    time.sleep(log_period)