Delay/Sleep for 8 hours?

Projects Programming
7

A little less work to activate/deactivate debugging serial output to the monitor -

// --- UNCOMMENT FOLLOWING TO ACTIVATE DEBUGGING CODE

//#define DEBUG_PRINT

#ifndef DEBUG_PRINT
    #define DebugPrint(X)
    #define DebugPrintln(X)
#else
    #define DebugPrint(X)     Serial.print(X)
    #define DebugPrintln(X)   Serial.println(X)
#endif

unsigned long SleepStart = 0;
const unsigned long SleepInterval = 32400000UL;

void loop() {  

 switch (mode) {
    case NORMAL:
      analogWrite(ULNOutputPin, 255);
      break;
    
    case SLEEP:
      analogWrite(ULNOutputPin,0);
      if (millis() - SleepStart > SleepInterval)
          mode = NORMAL;  // Resume normal operation
     
      DebugPrint("\nSleeping...");
      break;
  }


  // Button "Sleep" pressed?
  if (sleepButton.pressed()) {

    if(mode == NORMAL) {
      mode = SLEEP;
      SleepStart = millis();
    } else {
      mode = NORMAL;
    }
    
    DebugPrint("\nSleep-Button pressed, mode is now ");
    DebugPrint(mode);
  }

}