OWFS with I2C support on Raspberry Pi
Created 02/10/2015 | Using the 1 Wire File System with the 1 Wire Pi Plus and 1 Wire Pi Zero
This page details how to set up the 1 Wire File System to use with the 1 Wire Pi Plus and 1 Wire Pi Zero on Raspbian "Jessie" from http://www.raspberrypi.org/downloads
Step 1: Download the latest Raspbian linux image and burn to your SD Card following the instructions on http://elinux.org/RPi_Easy_SD_Card_Setup
Step 2: Follow our I2C, SMBus and Raspbian Linux tutorial to set up I2C on the Raspberry Pi.
Step 3: Go into the raspberry pi config utility and enable 1-Wire.
sudo raspi-config
Select 8 Advanced Options and then A9 1-Wire. A prompt will appear asking Would you like the one-wire interface to be enabled?, select Yes, exit the utility and reboot your raspberry pi.
sudo reboot
Step 4: Install OWFS and Python-OW
sudo apt-get install owfs python-ow
Step 5: Edit owfs.conf to enable the I2C 1 Wire interface
sudo nano /etc/owfs.conf
Comment out the following line
# server: FAKE = DS18S20,DS2405
Find the following section
# USB device: DS9490
#server: usb = all
#
Insert the line below to enable i2c support.
server: device = /dev/i2c-1
Find the section titled
######################### OWFS ##########################
Remove the hashes from the lines
mountpoint = /mnt/1wire
allow_other
Save your changes and exit the nano editor.
Step 6: Before you can use OWFS with Python you will need to start owserver. To start this when the Raspberry Pi boots you will need to modify rc.local.
sudo nano /etc/rc.local
Insert the following command at the top of the file.
sudo /opt/owfs/bin/owserver -c /etc/owfs.conf --pid-file /var/run/owfs/owserver.pid
Save your changes and exit the nano editor.
Step 7: Reboot your Raspberry Pi
sudo reboot
Step 8: Your Raspberry Pi should now work with OWFS. To test this we will create a python script which lists all 1 Wire devices connected to the 1 Wire Pi.
Create a new python script called 1wiretest.py
nano 1wiretest.py
Insert the following python code:
import ow
ow.init('localhost:4304')
sensorlist = ow.Sensor('/').sensorList()
for sensor in sensorlist:
print('Device Found')
print('Address: ' + sensor.address)
print('Family: ' + sensor.family)
print('ID: ' + sensor.id)
print('Type: ' + sensor.type)
print(' ')
Step 9: Save and run the file.
python 1wiretest.py
If everything works correctly the script should list every 1 Wire devices connected to the Raspberry Pi.
