arduino interrupt

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recently, used interrupt on arduino paralleled timer. timer on if there interrupt 1, , off if there interrupt 2. before timer triggered, arduino used turn on pump. happened is... when pump turned on, interrupt on arduino messed (triggered randomly).
i tried solve problem blocking electromagnetic field. hoped, electromagnetic field not interfere arduino process. did not work.
does has idea why thing happened? interrupt on arduino cannot interfered electromagnetic fields?
thank you

what supplying interrupt signal arduino , how wired? maybe pullup/pulldown needed stop em noise triggering interrupt.


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