Debug Serial

DebugSerial.ino

#define DEBUG 1  // Set to 0 to disable debugging, 1 to enable

#if DEBUG
  #define DEBUG_PRINT(x) Serial.print(x)
  #define DEBUG_PRINTLN(x) Serial.println(x)
#else
  #define DEBUG_PRINT(x)
  #define DEBUG_PRINTLN(x)
#endif

void setup() {
  Serial.begin(9600);

  // Actual operation serial prints
  Serial.println("Starting the system...");

  // Debugging serial prints
  DEBUG_PRINTLN("Debug: Entering setup");
  
  // Other setup code
}

void loop() {
  // Actual operation serial prints
  Serial.println("System running...");

  // Debugging serial prints
  DEBUG_PRINTLN("Debug: Inside loop");

  // Other loop code
}