Arduino shows bad-shape characters in its system monitor

Question

i want to code a simple Hello World code in Arduino to show it on its system monitor, my code is:

void setup()                    // run once, when the sketch starts
{
  Serial.begin(9600);           // set up Serial library at 9600 bps

  Serial.println("Hello world!");  // prints hello with ending line break 
}

void loop()                       // run over and over again
{
                                  // do nothing!
}

but when i run this code, i get This Image characters on the system monitor.Also, i change the Serial.begin() from 9600 to other things but it does not work!How can i fix the problem?

PhillyNJ PhillyNJ · Accepted Answer · 2016-07-19T17:22:04

Check your BAUD Rate on the Serial Monitor. Make sure its 9600, as you told it should be in your code:

Serial.begin(9600);

In the bottom of the Serial Monitor, there is a drop down to select the baud rate:

Arduino shows bad-shape characters in its system monitor

2 Answers