Installation of the OWFS (One Wire File
System)
First you need to install the following packages:
sudo apt-get update
sudo apt-get install automake autoconf autotools-dev
gcc-4.7 libtool libusb-dev libfuse-dev swig
python2.6-dev tcl8.4-dev php5-dev i2c-tools
If promoted answer Yes on any questions during the
install.
Download the latest version of OWFS to your usr/src
directory
cd /usr/src
sudo wget -O owfs-latest.tgz http://sourceforge.net/projects/owfs/files/latest/download
Unpack with the following command:
sudo tar xzvf owfs-latest.tgz
Next you must configure OWFS: (replace X.XXXX with the
version number you downloaded)
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cd owfs-X.XXXX
example : cd owfs-2.9p1
sudo ./configure
If everything is correct, you should get a result like
this:
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Next you need to compile OWFS which will take approx. 30
minutes with the following command:
sudo make
Next install OWFS which will take a few minutes
sudo make install
Once the installation has completed you need to create a
mountpoint for the 1wire folder:
sudo mkdir /mnt/1wire
In order to use the 1wire devices without root
privileges you have to change the FUSE settings, edit
the fuse configuration file with:
sudo nano /etc/fuse.conf
Update this line: #user_allow_other and remove the #
from the start, then save your changes
You can now start using OWFS to access your i2c devices
and any connected sensors:
sudo /opt/owfs/bin/owfs --i2c=ALL:ALL --allow_other /mnt/1wire/
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Using a terminal window navigate to the /mnt/1wire/
directory and use the ls command to list all connected
devices.
If you have a temperature sensor connected you should
have a folder starting with
28.xxxxxx
cd into this folder and then enter
cat temperature
to read the temperature of the sensor.
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18 -> DS2482-100 I2C 1-Wire bridge chip
/28.7E1CC8030000 - Connect & Detect
DALLAS 18B20P TEMP Sensor
/opt/owfs/bin/owserver --i2c= /dev/i2c-1:ALL
--- for Rs-Pi V2
/opt/owfs/bin/owserver --i2c=
/dev/i2c-0:ALL
--- for Rs-Pi V1
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/opt/owfs/bin/owdir
It appears that OWServer has found 1 1-wire busses,
exactly what we’re expecting to happen.
Lets see if we can get
some more details.
Which chip on the
breakout board is bus.0
/opt/owfs/bin/owread
/bus.0/interface/settings/name
DS2482-100
How about the i2c addresses of
each bus entry. bus.0
/opt/owfs/bin/owread
/bus.0/interface/settings/address
/dev/i2c-1:18
-- for Rs-Pi V2
dev/i2c-0:18
-- for Rs-Pi V1
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