DS18b20 temperature sensor not found

Question

Trying to install DS18b20 temperature sensor but it looks like the RPi cannot find it.

From console:

sudo modprobe w1-gpio
sudo modprobe w1-therm
cd /sys/bus/w1/devices/
ls

But there is nothing there :(

Have I done the wiring correct

Answer 1

Nr 3 did the work. Thx for quick help. sudo nano /boot/config.txt dtoverlay=w1-gpio,gpiopin=4