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#include <MD_Parola.h>
#include <MD_MAX72XX.h>
#include <SPI.h>

#define MAX_DEVICES 4
#define CS_PIN 10

MD_Parola myDisplay = MD_Parola(MD_MAX72XX::FC16_HW, CS_PIN, MAX_DEVICES);
int hallSensorPin = 2;
volatile bool sensorTriggered = false;
volatile bool messageDisplayed = false;

void sensorInterrupt() {
  sensorTriggered = true;
}

void setup() {
  myDisplay.begin();
  myDisplay.setIntensity(8);
  myDisplay.displayClear();
  pinMode(hallSensorPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(hallSensorPin), sensorInterrupt, RISING);
}

void loop() {
  int sensorValue = digitalRead(hallSensorPin);

  if (sensorTriggered && !messageDisplayed) {
    myDisplay.displayScroll("STOP STOP STOP STOP ", PA_CENTER, PA_SCROLL_LEFT, 30);
    messageDisplayed = true;
  } else if (messageDisplayed) {
    myDisplay.displayClear();
    messageDisplayed = false;
    sensorTriggered = false;
  }

  if (myDisplay.displayAnimate()) {
    myDisplay.displayReset();
  }
}