0

I have temperature sensor (DS18B20), also known as a 'one-wire sensor'. I've connected it to pin 4. I am using this code that someone wrote (source).

#!/usr/bin/env python

import time
DS18B20="/sys/bus/w1/devices/28-000005d34cd2/w1_slave"

r = 0

while True:

   r += 1

   f = open(DS18B20, "r")
   data = f.read()
   f.close()

   (discard, sep, reading) = data.partition(' t=')

   t = float(reading) / 1000.0

   print("{} {:.1f}".format(r, t))

   time.sleep(3.0)

It works as it should. But everytime I reboot the Pi I have to setup the sensor by using : modprobe w1-gpio and modprobe w1-therm. I want the Pi to do this automatically while booting up (or in the python script above). How can I do this?

3

Add the following lines to /etc/modules

w1-gpio
w1-therm

You'll need root privileges to do so (e.g. sudo vi /etc/modules or sudo nano /etc/modules).

0

Additionally, you will also need to add the following line to /boot/config.txt

dtoverlay=w1-gpio,gpiopin=4

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