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I'm trying to develop length measuring system and I'm using a industrial rotary encoder as the sensor.

A have decided to use an Arduino external interrupt for connect the encoder. But, Encoder will rotate very fast. I need to calculate PPR(Pulse per revolution) of the encoder according to maximum interrupt frequency of Arduino MEGA.

So, What is the maximum interrupt frequency of Arduino MEGA?

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    it depends on the program that you are running – jsotola May 16 at 6:52
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    Using the atmega's counter module might be the way to go – Sim Son May 16 at 9:43

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