Well, nanosecond accuracy isn't possible unless all have their fuses re-burned to run from same external clock source, and then all sit in setup ( ) waiting for a start signal to ensure the code is all doing the same thing at the same time.
Well, nanosecond accuracy isn't possible unless all have their fuses re-burned to run from same external clock source, and then all sit in setup ( ) waiting for a start signal to ensure the code is all doing the same thing at the same time.