Is it really necessary to run more than one of them at same time. Often it is enough to have many interrupts but only one runs at a time. Interrupts routines should be short and quick so it does not matter usually.It is probably possible to enable interrupts within interrupt procedure but I don't know/remember how. Running many interrupts at a time just create problems like endless interrupts and stuck Arduino.
You might want them if you have another higher-speed device - then its ISR caninterrupt the flow-sensor's ISR.But you wouldn't go out of your way unless there was a need. If they are alreadyprioritized its wise to choose a sensible priority level from the get-go.
For that to be an issue, you'd either be spending WAY too much time in an interrupt handler, or the flow sensor pulses would have to be come REALLY fast. The first is fixable by writing the code better and the second seems to me highly unlikely.Regards,Ray L.
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