This is follow on from the DS18b20 terminal example at http://www.pibits.net/learning/120.php , this time a python example
Code
import os
import glob
import time
os.system('modprobe w1-gpio') #load one wire communication device kernel modules
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/' #point to the address
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=') #find temperature
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string) / 1000.0
return temp_c
while True:
print(read_temp()) #Print temperature
time.sleep(1)
You should see something like
ds18b20 output
