Not able to read ds18b20 temp sensor

[Canedje]

I do try to read the temp from a ds18b20 sensor.

I installed WiringPi by the way: http://wiringpi.com/download-and-install/
I installed the sensor and tried to read it by the: https://iada.nl/blog/artikel/temperatuu ... spberry-pi

I checked the connection between the sensor and the py several times. There is 3.3V at the sensor
The data is connected to pin 7 of the GPIO (GPIO 4). There is a resistor 0f 4.7KOhm between 3.3V and data pin
If I look in :
ewh@raspberrypi-2 /sys/bus/w1/devices $ ls -l
totaal 0

There are no sensors visible.
Beside this I'm able to switch off and on a LED on GPIO 17. So it looks like the GPIO is working correctly.
cd
What am I doing wrong?
Please advice

[B.Goode]

If you are running a recent or updated version of Raspbian, this might be relevant: http://www.raspberrypi.org/forums/viewt ... 28&t=97314

[DougieLawson]

Add

Code: Select all

dtoverlay=w1-gpio

to /boot/config.txt and reboot.

[Canedje]

Add

Code: Select all

dtoverlay=w1-gpio

to /boot/config.txt and reboot.

Thanks a lot!!!
That was the solution.
I can read the ds18b20 now

I also have the dht22 sensor. Do I need to do something in advance for this sensor?

[DougieLawson]

For i2c and spi devices add

Code: Select all

dtparam=i2c_arm=on
dtparam=spi=on

[Canedje]

Thanks again
It all workes fine now!