From http://community.thingspeak.com/forum/thingspeak-api/multiple-ds18b20-on-raspberry-pi/#p5140

temps.py

import os
import glob
import time
import sys
import datetime
import urllib2


baseURL = "https://api.thingspeak.com/update?api_key=(MY KEY)&field1=&field2="

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

# add more sensor variables here based on your setup

temps=[]


base_dir = '/sys/bus/w1/devices/'

device_folders = glob.glob(base_dir + '28*')

def read_temp_raw(device_file): 
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines
 
def read_temp(device_file): # checks the temp recieved for errors
    lines = read_temp_raw(device_file)
    while lines[0].strip()[-3:] != 'YES':
        time.sleep(0.2)
        lines = read_temp_raw(device_file)

    equals_pos = lines[1].find('t=')
    if equals_pos != -1:
        temp_string = lines[1][equals_pos+2:]
        # set proper decimal place for C
        temp = float(temp_string) / 1000.0
        # Round temp to 2 decimal points
        temp = round(temp, 1)
    # value of temp might be unknown here if equals_pos == -1
    return temp

while True: #infinite loop 
    
    for sensors in range (2): # change number of sensors based on your setup
        device_file=device_folders[sensors]+ '/w1_slave'
        temp[sensors] = read_temp(device_file)
        print device_file,sensors,temp[sensors]
    
    g = urllib2.urlopen(baseURL + "&field1=%s&field2=%s" % (temp[0], temp[1]))
	
    time.sleep(60)

 

import os
import glob
import time
import sys
import datetime
import urllib, urllib2

baseURL = "https://api.thingspeak.com/update?api_key=XXXXXXXXXXX"

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

add more sensor variables here based on your setup( 28-

temp=['sensor code','tttttttttt','ddddddddddd','ssssssssss']

base_dir = '/sys/bus/w1/devices/'

device_folders = glob.glob(base_dir + '28*')

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

def read_temp(device_file): # checks the temp recieved for errors
lines = read_temp_raw(device_file)
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw(device_file)

equals_pos = lines[1].find('t=')
if equals_pos != -1:
    temp_string = lines[1][equals_pos+2:]
    # set proper decimal place for C
    temp = float(temp_string) / 1000.0
    # Round temp to 2 decimal points
    temp = round(temp, 1)
# value of temp might be unknown here if equals_pos == -1
return temp

while True: #infinite loop

for sensors in range (4): # change number of sensors based on your setup
    device_file=device_folders[sensors]+ '/w1_slave'
    temp[sensors] = read_temp(device_file)
    print device_file,sensors,temp[sensors]

g = urllib.urlopen(baseURL + "&field1=%s&field2=%s&field3=%s&field4=%s" % (temp[0],temp[1],temp[2],temp[3]))

time.sleep(60)