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Interrupts pin on mux shield

Former Member

Hi Simon,

I have to implement a system which controls motors and sensors in a big quantity.

I use Arduino mega 2560 and I need also a Mux Shield II to increase the number of I/O pins.

If I need many interrupt pins (I only know the 6 interrupt pins of Arduino mega 2560), CAN I SET THE PINS OF MUX SHIELD II AS INTERRUPT? Or else, how can I do?

 

Thank you very much!!!

Alessandro.

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  • How many interrupts do you need ?, do they all go to unique service routines ? or a common interupt routine

     

    Thanks

  • in reply to Robert Peter Oakes

    I need to control 13 rotary motors. So I have to check 13 encoder sensors, that is 2 square waves for each encoder (then 2 pins).

    So I need 26 interrupt pins if Arduino's loop() is longer than half period of the square wave of each encoder, that's because I need to keep control of the position of each motor.

    If, instead, the loop() function is faster than half period, then, maybe I don't need them at all!

    So, I ask you these questions:

    1) if I need all these interrupt pins (every interrupt has its own function because motors are different), how can I take them from the mux shield II attached to Arduino mega 2560?

    2) According to you, is it better to use a quadrature module between the encoder and Arduino (like the LS7184) or is easier and convenient to put the two encoder square waves directly into Arduino's pins?

     

    Thank you very much.

    Alessandro.

  • in reply to Former Member

    What speed ad these motors turning, even the 2560 is only running at 16 or 20 MHz so I'm concerned that if you are writing the code using wiring ( arduino standard coding vs at mega direct hardware code) it will not be fast enough to detect all interupts

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