My Wishes for Arduino IDE

Community Suggestions for the Arduino Project
5

LeoTimmermans:
It would be great if there were a buttom with which you can comment on/off (delete) Serial.println cmd

Actually very easy to do this in your code with no overhead, only requires adding two lines and none of your debug prints need to be changed:

#define DEBUG true  //set to true for debug output, false for no debug ouput
#define Serial if(DEBUG)Serial

LeoTimmermans:
(also the famous while (! Serial))

while (DEBUG && !Serial);

This can easily be extended to allow multiple levels of debug ouput, still with no overhead:

#define DEBUG_ERROR true
#define DEBUG_ERROR_SERIAL if(DEBUG_ERROR)Serial

#define DEBUG_WARNING true
#define DEBUG_WARNING_SERIAL if(DEBUG_WARNING)Serial

#define DEBUG_INFORMATION true
#define DEBUG_INFORMATION_SERIAL if(DEBUG_INFORMATION)Serial

void setup() {
  Serial.begin(9600);
  while (!Serial);
  DEBUG_ERROR_SERIAL.println("This is an error message");
  DEBUG_WARNING_SERIAL.println("This is a warning message");
  DEBUG_INFORMATION_SERIAL.print("The state of pin 5 is ");
  DEBUG_INFORMATION_SERIAL.println(digitalRead(5) ? "HIGH" : "LOW");
  Serial.println("This is standard program output");
}

void loop() {}

You can use the boolean debug macros to switch on and off other parts of your code too.