How to use adc pin?

Discussion in 'UDOO NEO' started by hiten, Dec 24, 2019.

  1. hiten

    hiten UDOOer

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    hello, I want to try the interface thermistor sensor at A0 pin on udoo neo board and try to get data from "/sys/bus/iio/devices/iio\:device0/in_voltage0_raw" location for this I change both uEnv.txt file line "m4_enabled=false" from sd card partition /data and /systems

    After changes, I fire "cat /sys/bus/iio/devices/iio:device0/in_voltage0_raw" command for read pin value but it gives wrong data linke :64,0,0,0,234,564,23,45 ..... random value so how to solve this things

    I follow https://www.udoo.org/docs-neo/Hardware_&_Accessories/ADC.html links for use adc pin but there is not any clear guide,

    I thinks there are some changes must be done in kernel side or in dts file but I don't know how I start work on adc pin or how to use adc, and how to disable m4 core please help me

    Thanks,
     
  2. waltervl

    waltervl UDOOer

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    Is there anything connected to the pin? Could be that is is just floating if nothing is connected.
     
  3. hiten

    hiten UDOOer

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    yes I connect my thermistor data pin at A0(39)
     
  4. waltervl

    waltervl UDOOer

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    I see fom another topic that you run on Android. That will make things a little bit more difficult as there is no one known that does this kind of interfacing with Android.
     
  5. hiten

    hiten UDOOer

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    so what should I do, I can't find anything on the internet and not any document or any example steps
     
  6. waltervl

    waltervl UDOOer

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    Try it on udoobuntu first, and see what happens. Android has never been so developed on the Neo due to its complex architecture with a combined A9M4 CPU sharing it's GPIO
     
  7. hiten

    hiten UDOOer

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    ok thanks for replay
     

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