FriendlyELEC-Forum

Hi everyone. I have simple problem. I try to read temperature from DS18B20 sensor. I use ubuntu 16.04 and kernel: linux 4.16 it is default image from friendly elec. I try to activate 1-wire overlay so I write:

sudo modprobe w1-gpio gpio=203
sudo modprobe w1-therm

and after lsmod command:

Module Size Used by
w1_therm 16384 0
w1_gpio 16384 0
wire 28672 2 w1_gpio,w1_therm

I also have directory /sys/bus/w1/devices/ but this folder is empty. When I worked with Rpi I must also add overlay to /boot/config.txt but this system distribution don't have any config.txt in /boot. Do you have any idea what is wrong or what else I must to do? Thank you for any tip and advice

Does this device use .dtsi files? (Device tree)

Hi. I have nanoPi only few days but I think yes. Generally I know what is the device tree but I don't have any practice. There are some of files with .dtb extension f.e. in /boot/overlay

I have been trying to help a guy get I2C to work on the NanoPC-T2 ... unsuccessfully so far.

I would have a look through those .dbt files to see if there are anything to do with 1-wire.

The Raspberry Pi has this for 1-wire:

r.baczynski.10 wrote:
Hi everyone. I have simple problem. I try to read temperature from DS18B20 sensor. I use ubuntu 16.04 and kernel: linux 4.16 it is default image from friendly elec. I try to activate 1-wire overlay so I write:

sudo modprobe w1-gpio gpio=203
sudo modprobe w1-therm

and after lsmod command:

Module Size Used by
w1_therm 16384 0
w1_gpio 16384 0
wire 28672 2 w1_gpio,w1_therm

I also have directory /sys/bus/w1/devices/ but this folder is empty. When I worked with Rpi I must also add overlay to /boot/config.txt but this system distribution don't have any config.txt in /boot. Do you have any idea what is wrong or what else I must to do? Thank you for any tip and advice

Hii,

Have you configured your sensor in device tree ??

Have you compiled your device tree after your device into device tree ??


I also have directory /sys/bus/w1/devices/ but this folder is empty. When I worked with Rpi I must also add overlay to /boot/config.txt but this system distribution don't have any config.txt in /boot. Do you have any idea what is wrong or what else I must to do?

You can add the overlay in /etc/modules

like for example I2C in NanoPC-T2

sudo nano /etc/modules

# Modules to be loaded at boot time

i2c-dev
i2c-adapter
i2c-nexell

place your modules in this file .

NanoPC-T2
If the software is friendlycore-xenial-4.4 there is sudo npi-config and in the advanced option is i2c enable/disable. It works perfect with nanoPi neo core and neo core 2.

To enable 1-wire there are 3 options to load kernel modules:




All of this command works well with Rpi but have no effect with my nanoPi. In /boot/config-4.14.0-h5 I found and change from m to y 3 lines:



I also add w1-gpio to /etc/modules and after reboot module is enable but it still don't work. My path /sys/bus/w1/devices is empty.

I solved my problem. I install armbian for nano pi neo core 2 and enable in config 1-wire. Thanks for help.