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Raspberry Pi
Raspberry Pi Forum need .py code for reading Max31855 A/D temp converter
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Forum Thread Details
  • State Verified Answer
  • Replies 32 replies
  • Answers 2 answers
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  • raspberry_pi
  • raspberrypi
  • adafruit
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need .py code for reading Max31855 A/D temp converter

donb
donb over 11 years ago

Thru this site I got info on a Adafruit Max31855 module. Now does anyone have the code necessary to read the digital output of this fine little module? I don't have the experience to write the code, but truly need the code to save a very long and steep learning curve.   Don

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  • mconners
    0 mconners over 11 years ago

    While I don't have that particular module I went to the Adafruit site and checked it out. It looks like it is a simple SPI device.

     

    Check here for python instructions Simple SPI on Raspberry Pi - 100RandomTasks

     

    From Adafruit's arduino example it looks like to read celsius temperature, you do a 32 bit read of the SPI data, shift right 18 bits and multiply by .25 and you've got celcius temperature.

     

    https://github.com/adafruit/Adafruit-MAX31855-library/blob/master/Adafruit_MAX31855.cpp

     

    You'll be surprised at how easy this really is.

     

    Good luck,

     

    Mike

     

    Edited bad link

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  • mconners
    0 mconners over 11 years ago in reply to mconners

    Taking a second look at the RasPi SPI library, you may have to make your own 32 bit read, but everything is in the .cpp file linked above.

     

    Take a stab at it, if you can't figure it out, post your code here and we can suggest some fixes.

     

    Mike

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  • mconners
    0 mconners over 11 years ago in reply to mconners

    Taking a second look at the RasPi SPI library, you may have to make your own 32 bit read, but everything is in the .cpp file linked above.

     

    Take a stab at it, if you can't figure it out, post your code here and we can suggest some fixes.

     

    Mike

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  • donb
    0 donb over 11 years ago in reply to mconners

    Thanks Michael, I will take a stab at it. I am assuming that the .ccp code is similar to the .py code.

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  • mconners
    0 mconners over 11 years ago in reply to donb

    There are definitely syntactical differences between the 2, but the ideas will be similar.

     

    The Adafruit example is good because she commented out alot of the fluff. It is really simplified to show only what is necessary.

     

    Like I said, give it a stab, just a simple read from the device, there are plenty of folks on here who are willing to help debug code.

     

    Mike

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