Combing #ifdef with a header file and ArduinoTrace library to setup toggling on and off for debugging Arduino code.
#define DEBUG // Comment to turn off debug statements
#define ARDUINOTRACE_SERIAL SerialUSB
#include <ArduinoTrace.h>
#include "DebugUtils.h"
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
#ifdef DEBUG
SerialUSB.begin(9600);
while (!SerialUSB) { }
delay(100);
#endif
DEBUG_PRINT("Start blinking");
}
void loop() {
DEBUG_PRINT("HIGH");
digitalWrite(LED_BUILTIN, HIGH);
delay(500);
DEBUG_PRINT("LOW");
digitalWrite(LED_BUILTIN, LOW);
delay(500);
DEBUG_TRACE();
}