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What do I need for my arduino + current sensor to do data logging ?

haoen456123

Hi all, 

I am currently working on an Arduino project which requires me to data log the current produced and study the current trend. 

Some requirements are : 

DC current up to 1A

1 - 5 seconds data logging of current data 

Resolution of 0.1mA

Power no limit 

Can anyone let me know which parts I need to form this set up to record the current produced ? 

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  • 0

    To resolve 0.1 mA and 1 Amp with the same sensor, you need a 16 bit A/D, which is beyond a normal Arduino. There are current sense chips that have a high-resolution built-in A/D converter that can interface to some Arduinos. Such as a TI INA237.

  • 0 in reply to dougw

    And not just that.  You need to check with the datasheet about the error rates because some can be quite high and all will have some impact on readings at 100uA.  I think you may need to do some form of standard deviation processing on the data presentation to better qualify what the results are showing and take account of outliers.  You mention 1 to 5 seconds of data but at what resolution, e.g. once per 0.1 seconds?  Check the sample rate at 16-bit vs your timing resolution vs accuracy.  

    Ultimately, how you log will depend upon the volume of data points that need to be logged, how real-time the trend needs to be observed etc.  I think more info is required to help more.

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  • 0 in reply to dougw

    And not just that.  You need to check with the datasheet about the error rates because some can be quite high and all will have some impact on readings at 100uA.  I think you may need to do some form of standard deviation processing on the data presentation to better qualify what the results are showing and take account of outliers.  You mention 1 to 5 seconds of data but at what resolution, e.g. once per 0.1 seconds?  Check the sample rate at 16-bit vs your timing resolution vs accuracy.  

    Ultimately, how you log will depend upon the volume of data points that need to be logged, how real-time the trend needs to be observed etc.  I think more info is required to help more.

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