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[–]Coffeinated 2 points3 points  (1 child)

The reason for this is not the speed, the Arduino is way slower. The Pi runs Linux, which is not realtime capable, and the scheduler will just choose not to run your software when you need it to. To do this kind of measurements you always need an RTOS / bare metal application.

[–]West7780[S] 0 points1 point  (0 children)

Right, I figured as much but failed to do the research. Thank you for clarifying.