Raspberrypy Temperature Logger

raspberry_temperature.py

import time
import datetime

period = 1 # secs between each measurement
filename = "output.csv" # filename to write data.
    
def get_temperature():
    # Open the file that we viewed earlier so that python can see what is in it. Replace the serial number as before.
    tfile = open("/sys/bus/w1/devices/10-000802824e58/w1_slave")
    # Read all of the text in the file.
    text = tfile.read()
    # Close the file now that the text has been read.
    tfile.close()
    # Split the text with new lines (\n) and select the second line.
    secondline = text.split("\n")[1]
    # Split the line into words, referring to the spaces, and select the 10th word (counting from 0).
    temperaturedata = secondline.split(" ")[9]
    # The first two characters are "t=", so get rid of those and convert the temperature from a string to a number.
    temperature = float(temperaturedata[2:])
    # Put the decimal point in the right place and display it.
    temperature = temperature / 1000
    return temperature
    
while True:
    f = open(filename,"a")
    temp = get_temperature()
    d = datetime.datetime.now()    
    dt = "%s" % d.date()
    tm = "%s" % d.time()
    f.write("%s,%s,%s\n" % (dt, tm, temp))
    time.sleep(period)
    f.close()