===== Dallas 1-Wire Support =====

  * Support for Dallas 1 Wire is included on Kernel 3.10.67-52 and upwards. Make sure you are updated.
  * Will cover an example of a temperature sensor well known **DS1820** other 1 wire IC's are supported too.

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You have to edit **/etc/modprobe.d/blacklist-odroid.conf** file to enable the 1-wire driver because the driver exists in the blacklist by default.
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Default GPIO for 1-Wire is **Pin #7 (GPIO83)**

  * **Connection: With External-Supply**
{{:en:1-wire-external-power.png?750|}}

Pin 1 (Left): Ground (-)

Pin 2 (Middle): Pin #7 C1

Pin 3 (Right): VCC (3.3V)

You also need to add a resistor from 4.7k to 10k between pin 2.

  * **Connection: Supplying the Parasite-Powered**
{{:en:1-wire-parasite-power.png?750|}}

Pin 1 (Left): Ground (-)

Pin 2 (Middle): Pin #7 C1

Pin 3 (Right): Ground (-)

You also need to add a resistor from 4.7k to 10k between pin 2.

  * Load the required kernel modules: <code>modprobe w1-gpio && modprobe w1-therm</code>
  * Check if your sensor is working: <code>root@odroid:~# cd /sys/bus/w1/devices/
root@odroid:/sys/bus/w1/devices# ls
10-000802f41d67  w1_bus_master1
root@odroid:/sys/bus/w1/devices#</code>

As you can see my sensor is detected as **10-000802f41d67**, each sensor has a different id. So yours will be different.

  * Read the temperature:<code>root@odroid:/sys/bus/w1/devices# cd 10-000802f41d67
root@odroid:/sys/bus/w1/devices/10-000802f41d67# cat w1_slave
33 00 4b 46 ff ff 03 10 30 : crc=30 YES
33 00 4b 46 ff ff 03 10 30 t=25562
root@odroid:/sys/bus/w1/devices/10-000802f41d67#
</code>

Temperature is t=25562 or 25.562 degree's Celsius.


Multiple sensors can be connected on the same line as the draw below.

{{:en:untitled_sketch_bb2.png?750|}}

<code>
root@bigsmall:/sys/bus/w1/devices# ls
10-000802f37119  10-000802f41d67  w1_bus_master1
</code>
Two sensors in parallel.