Need to get a signal from led but only when constantly on

i have piece of equipment illuminates led when on, want use led being on input arduino way can pickup signal equipment.

but have problem:

when equipment in normal operation led illuminated if fault develops led flashes on/off every 500ms.

i not want arduino if led flashing
only when led on steadily should arduino run.

i new coding don't know start appreciated

so, if led illuminated period of, 1 second, enough you. try (untested)

code: [select]


unsigned long leddetectedms = 0;
int ledpin = 5 ;  // choice
boolean lastledstatus = low ;

setup() {
    pinmode( ledpin , input ) ;
}

loop() {

   if ( ledpin == high &&  lastledstatus == low) {
      leddetectedms = millis() ;
   }
   else if ( ledpin == low ) {
      leddetectedms = 0 ;
   }
   if ( ledpin == high  &&  millis() - leddetectedms > 1000ul  && leddetectedms != 0 ) {
       // equipment on
   }
   else {
      // equipment off
   }
   lastledstatus = ledpin ;
}


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