DS18B20

DS18B20

DS18B20

Pinout

DS18B20 Image found here

Schematic

Code

# add this line to /boot/config.txt
dtoverlay=w1-gpio

modprobe w1-gpio
modprobe w1-therm

# device directory
cd /sys/bus/w1/devices
ls -l
# cd to your unique DS18B20 identifier
cat w1_slave

#!/usr/bin/env python

import time
import os

os.system("/sbin/modprobe w1-gpio")
os.system("/sbin/modprobe w1-therm")

try:
        while True:
                # tempfile = open("/sys/bus/w1/devices/28-000006f2f3e4/w1_slave")
                tempfile = open("/sys/bus/w1/devices/28-80000028ac7c/w1_slave")
                thetext = tempfile.read()
                tempfile.close()
                tempdata = thetext.split("\n")[1].split(" ")[9]
                temperature = float(tempdata[2:])
                temperature = 9.0 / 5.0 * (temperature / 1000) + 32
                print temperature

                time.sleep(1)
except KeyboardInterrupt:
        pass

Resources

• Simple Guide to the RPi GPIO Header and Pins

Arduino

Resources

• Brick-Temperature-DS18B20