Read 1wire temp sensor on Axon



  • Hi,
    I am trying to detect 1wire temp sensor DS18B20 on my Axon L205 unit with Node-RED OS provided by Unipi.
    I tryied enabling EVOK OWBUS to scan sensor, but without success.

    I checked i2c bus to see presence of sensor:

    unipi@L205-sn57:~$ sudo i2cdetect -y 0
         0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
    00:          -- -- -- -- -- -- -- -- -- -- -- -- --
    10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- --
    20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    50: -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- --
    60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- UU
    70: -- -- -- -- -- -- -- --
    
    unipi@L205-sn57:~$ ls -al /sys/bus/w1/devices/
    total 0
    drwxr-xr-x 2 root root 0 Jan 14 18:29 .
    drwxr-xr-x 4 root root 0 Jan 14 18:22 ..
    

    Here is EVOK config:

    [OWBUS_1]
    owbus = /dev/i2c-0                              ; Mandatory, scanned bus (--i2c=/dev/i2c-1:ALL or localhost:2122 or 'u' for USB dongle)
    interval = 3                                    ; Mandatory, [s] length of sensor reading
    scan_interval = 300                             ; Mandatory, [s] How often the scanning is done
    EVOK version = 2.3.6
    
    unipi@L205-sn107:~$ sudo lsmod
    Module                  Size  Used by
    unipi                 110592  6
    industrialio           57344  1 unipi
    brcmfmac              258048  0
    brcmutil               16384  1 brcmfmac
    rtc_ds1307             24576  0
    rtc_unipi              16384  0
    at24                   20480  0
    
    unipi@L205-sn107:~$ sudo ls -la /sys/bus/w1/
    ls: cannot access '/sys/bus/w1/': No such file or directory
    

    I tryied to search over forum, but this issue is discuss in context of RasberryPI/Neuron and I am not sure how relevant it is to Axon unit.

    Thanks



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