Read temperature with DS18B20 | Raspberry Pi 2

You will need:

The sensor itself DS18B20

http://www.ebay.com/itm/Waterproof-Digital-Thermal…

Resistor (I’m using 4,7k Ohm)

Because of the picture is blurry the color codes are: yellow,violet,red,gold

Jumper wires

You can find the resistor and the jumper wires online, or in your local electronics store.

Step 2: Wire it UP!

The wiring is very simple.

I got the drawn picture from https://learn.adafruit.com/downloads/pdf/adafruits…

Connect the 3.3V (red) from the sensor to the 3.3V rail on your raspberry pi

Connect the GND(black) to the GND rail on your raspberry pi

Connect the Data(yellow) to a pin on the raspberry pi

Connect your resistor with the 3.3v and the Data as shown in the drawn picture

!!!!WARNING!!!!

IT MUST BE ON THE PIN 7 – GPIO04(GPIO_GCLK)

THE BEGINNING OF THE RESISTOR MUST BE ON THE 3.3V (yellow front)

Step 3: Now the coding! Without it the sensor is just a piece of wire.

Turn on your raspberry pi and let’s begin.

First step:

First we need to config a file.

Do that by typing: sudo nano /boot/config.txt

This file let’s you config your booting.

Here you search for dtoverlay

When you have found it just correct it to: dtoverlay=w1-gpio

Type sudo reboot, to reboot your device

Second step:

Type:

sudo modprobe w1-gpio && sudo modprobe w1_therm

ls -l /sys/bus/w1/devices/

cat /sys/bus/w1/devices/28-000006dfa76c/w1_slave