Random initial serial monitor characters

Projects Programming
1

When I use the millis() function to incorporate a time component to my sketch, I get these random characters that show up on the first line of the serial monitor when I initially start up the serial monitor. Why does this happen? And is there a way to fix this?

unsigned long time;
const int ldrSensor = A1;

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

void loop() {
  Serial.print("Time: ");
  time = millis();
  Serial.print(time);
  Serial.print("ms");
  Serial.print("  ");
  delay(50);
  
  int ldrRead = analogRead(ldrSensor);
  Serial.print("LDR = ");
  Serial.print(ldrRead);
  Serial.println("  ");
  delay(50);
}

Here is what I see when I start up the serial monitor. The first line shows the random characters.

LDRꢂªþTime: 0ms LDR = 406
Time: 100ms LDR = 405
Time: 200ms LDR = 405
Time: 302ms LDR = 405
Time: 402ms LDR = 404
Time: 502ms LDR = 404
Time: 604ms LDR = 405
Time: 704ms LDR = 407

2

i googled with your subject,

and there is some answer may help you.

http://arduino.cc/playground/Main/DisablingAutoResetOnSerialConnection

3

I get the garbage characters at the start all the time as well. It's a little annoying and I deal with it by starting out the sketch with Serial.println("\n").

It's probably a bug in the second uP on the Arduino board that is used for USB communication.