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# -*- coding: utf-8 -*-
"""Python script to read temperature.
I plug the sensor data into pin 4 on the raspberry pi which requires pin 4 to
be a gpio pin. If the modprobe commands don't results in the device showing up
in the bus folder then make sure the following line is in `/boot/config.txt`
```
dtoverlay=w1-gpio,gpiopin=4
```
After rebooting the files should show up.
"""
import glob
import os
import time
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():
"""Read the raw temperature from the device."""
f = open(device_file, 'r')
lines = f.readlines()
f.close()
return lines
def read_temp():
"""Read the temperature of the probe."""
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
while True:
print(read_temp())
time.sleep(1)
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