sudo nano /boot/config.txt

dtoverlay=w1-gpio

sudo modprobew1-gpio
sudo modprobe w1-therm

cd /sys/bus/w1/devices
ls

cd 28-xxxx
cat w1_slave

Software configuration

Let's now look at the code to display the temperature in degrees Celsius and Fahrenheit every second on the screen.

Here we import the libraries used in the program:

import os1 
import glob1 
import time1 

Here we define the devices configured in the protocol:

os1.system('modprobew1-gpio') 
os1.system('modprobew1-therm1') 

Here we define the folders where the devices are configured:

directory = '/sys/bus/w1/devices/' 
device_folder1 = glob1.glob(directory + '28*')[0] 
device_file1 = device_folder1 + '/w1_slave' 

Then we define the functions to read temperature and configure the sensor:

defread_temp(): 
f = open(device_file1, 'r') 
readings = f.readlines() 
f.close() 
return readings 

Read the temperature with the function:

defread_temp(): 
readings = read_temp() 

In this function, we compare when it received the message YES and get the t= character. We also get the value of the temperature:

while readings[0].strip()[-3:] != 'YES': 
time1.sleep(0.2) 
readings = read_temp() 
equals = lines[1].find('t=') 

Then we calculate the temperature, temp in C and F, and return the values:

if equals != -1: 
temp = readings[1][equals pos+2:] 
tempc = float(temp) / 1000.0 
tempf = temp * 9.0 / 5.0 + 32.0 
returntempc, tempf 

It repeats the cycle every second:

while True: 
print(temp()) 
time1.sleep(1) 

Displaying the readings on the screen

Now we need to execute thermometer.py. To show the results of the scripts made in Python, open your PuTTY terminal, and type the following command:

sudo python thermometer.py

The command means that, when we run the thermometer file, if everything is running perfectly, we will see the following results: