How does 1-wire decide what address to use?

Question

I've been following this simple tutorial to get a temperature reading from a raspberrypi, http://blog.vokiel.com/raspberry-pi-odczyt-temperatury-przez-nodejs/?lang=en

Under w1/devices, what I'm calling the address is the file where the value of the 1-wire bus is stored.

For example, the tutorial says

/sys/bus/w1/devices/28-00000249bf39 $ cat w1_slave 
c3 01 4b 46 7f ff 0d 10 2f : crc=2f YES
c3 01 4b 46 7f ff 0d 10 2f t=28187

Where the address is 28-00000249bf39. On my device, the address is 28-000004acb882. How are these addresses set? Is it possible to define your own?

score 3 · Accepted Answer · answered Apr 09 '14 at 09:17

3

As the docs says:

Each Device has a Unique 64-Bit Serial Code Stored in an On-Board ROM

So you can't set your own.

answered Apr 09 '14 at 09:17

Vokiel

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score -2 · Answer 2 · edited Jan 25 '16 at 13:10

-2

To read the temperature from youre devide just type

cat 28.00000249bf39/temperature

edited Jan 25 '16 at 13:10

Ahmed Ashour

5,179
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answered Jan 25 '16 at 11:12

Eriel72

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How does 1-wire decide what address to use?

2 Answers2