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I'm tinkering with an electronic skateboard build and I'm looking for a way to do some current measurements "on-the-go". What's the easiest way to implement this?

It wouldn't be a part of the final design, I'm just trying to collect real-world power data for my second board revision.

Basically, I'm looking for something like this DIY power meter/logger (pictured below) but for higher currents (up to ~20A to be safe).

DIY power meter/logger

Would something like SparkFun's split core current transformer (pictured below) combined with a battery powered Arduino work?

SparkFun's split core current transformer

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The "split core current transformer" that you linked will only sense AC current. You will need a hall-effect current transducer. I believe they are available in split-core versions. You could certainly design a data acquisition system with a battery-powered Arduino and a hall-effect current transducer.

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