Accessing 1-wire devices on Raspberry Pi using OWFS

To connect 1-wire serial devices to the RPi I am using a DS9490R USB 1-wire adapter (rather than wiring I2C 1-Wire master components to GPIO I2C – which I might look at sometime down the track)

Install packages

sudo apt-get install owfs ow-shell

Edit config file

vim /etc/owfs.conf

! server: server = localhost:4304
# USB device: DS9490
server: usb = all
######################### OWFS ##########################
mountpoint = /mnt/1wire
allow_other
####################### OWHTTPD #########################
http: port = 2121
####################### OWFTPD ##########################
ftp: port = 2120
####################### OWSERVER ########################
server: port = localhost:4304

Create Startup Script

I created a startup script for owfs modelled on the owserver script (not sure why this one is actually missing)

vim /etc/init.d/owfs

#!/bin/sh
### BEGIN INIT INFO
# Provides: owfs
# Required-Start: $remote_fs $syslog $network $named
# Required-Stop: $remote_fs $syslog $network $named
# Should-Start: owfs
# Should-Stop: owfs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: 1-wire file system mount & update daemon
# Description: Start and stop 1-wire file system mount & update daemon.
### END INIT INFO
CONFFILE=/etc/owfs.conf
DESC="1-Wire file system mount"
NAME="owfs"
DAEMON=/usr/bin/$NAME
case "$1" in
  start)
        echo "Starting $NAME"
        $DAEMON -c $CONFFILE
        ;;
  stop)
        echo "Stopping $NAME"
        killall $NAME
        ;;
  *)
        echo "Usage: $N {start|stop}" >&2
        exit 1
        ;;
esac
exit 0

Starting daemons

/etc/init.d/owserver start
/etc/init.d/owfs start

Checking output

#ls /mnt/1wire/

Should show output similar to:

10.575349000000 12.95DD17000000 alarm simultaneous uncached
10.575349000000 12.95DD17000000 bus.0 statistics
12.57DD16000000 81.B2EA2E000000 bus.1 structure
12.57DD16000000 81.B2EA2E000000 settings system

cat /mnt/1wire/10.575349000000/temperature

Will then show the temperature of the particular DS18S20 temperature sensor.

• 1-Wire
• Data
• Raspberry Pi
• Sensors