1 wire DS2431 setup on raspberry pi

precursor:

The January 2015 Raspbian release, with Pi 2 support, switches to a new kernel (3.18), and includes a configuration change to enable Device Tree support by default.

use sudo raspi-config to enable I2C in Advanced Options > I2C.

Now we start:

Here we are using 1-wire eeprom DS2431 as example, with 2k2 resistor as pull up to 3v3 Vcc.

We chose GPIO25 of BCM, ( which is wiringPi Pin6) as I/O pin of DS2431

referring to https://www.raspberrypi.org/forums/viewtopic.php?p=518859#p518859

step 1
sudo su -

In /boot/config.txt need to be add following line:

dtoverlay=w1-gpio,gpiopin=25

>>> reboot

step 2
before modprobe:

sudo su -
modprobe w1-gpio
ls /sys/bus/w1/devices

you can see eeprom is NOT yet found under 2d-00001ac198e4 (2d is family code of DS2431)

modprobe w1_ds2431
ls -al /sys/bus/w1/devices

now you see eeprom. Bingo!

step 3

To dump the eeprom content, while still at /sys/bus/w1/devices/2d-00001ac198e4 directory:

su -c 'echo "CHIP EEPROM TEST" > eeprom'

step 4. to display versions of w1gpio module:

modinfo w1gpio

in etc/modules, add

w1_ds2431

this will load the w1_ds2431 every time in boot up

step 5

install OWFS

references:
nextthing
device tree

STICKY:I2C, SPI, I2S, LIRC, PPS, stopped working? Read this.

1-wire not working...see reply from philE

packtpub on install owfs ( needs some minor update on instructions...)

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