RFM69 temperature and how to check RFM69 is set to high power

  • Hello,

    I am using RFM69HW and found how to use high power reading this post. I am now want to get the RFM69 temperature in my sketch and check if I am using high power mode.

    I found in the RFM69 library useful methods, but I don't know how to call them in my sketch ... I tried radio.readTemperature but it's not correct.

    Do you have an idea ?
    I am also interesting in getting the RSSI !



  • Admin

    Guess you would have to add something like this in your sketch:

    extern RFM69 _radio;

    And use use _radio.readTemperature()

    (in the development branch)

    In 1.5 the radio-object is a private member of the MySensors radio-driver class so you'd have to make it public to have access to it.

  • Thanks @hek !

    I modified the file "MyTransportRFM69.h" and moved RFM69 radio from private to public.

    I then added extern RFM69 _radio; in my sketch.
    And in the loop method, I also added _radio.readTemperature().

    But the compilation failed:

    SerialGateway.cpp.o: In function `loop':
    /Users/carlierd/SerialGateway.ino:130: undefined reference to `_radio'
    /Users/carlierd/SerialGateway.ino:130: undefined reference to `_radio'
    collect2: error: ld returned 1 exit status

    For the moment I prefer using the stable branch until I get something working.

  • Admin

    You're mixing the two solutions.

    In 1.5 you would reach the public radio object by


  • Sorry @hek but it's still not clear for me 😉

    I am using 1.5, so I assume that I have to:

    • put radio as public in MyTransportRFM69.h
    • add radio.radio.readTemperature() in my sketch

    Thanks !

  • Admin

    Yep, should work.

  • I got this error during compilation:

    SerialGateway.ino: In function 'void loop()':
    SerialGateway:128: error: 'radio' was not declared in this scope
    'radio' was not declared in this scope

    Any idea ?

  • Admin

    transport.radio.getTemperature() then? O

  • It's perfect !! Thanks !

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