Problems with Serial Communication

Using Arduino Programming Questions
1

I'm trying to control my Arduino via serial input from a computer. I was having problems with getting this to work, so I ran a very basic code as a test. This prints -1 constantly. Am I doing something wrong in the code here, and how might I fix the problem?

void setup() {
Serial.begin(9600);
int Data = 0;
}

void loop() {
while(Serial.available() > 0){
Data = Serial.read();
Serial.print(Data);
}
}
2

Try this

if (Serial.available() > 0){
byte Data = Serial.read() ; // try char also, see what is different
Serial.print (Data);
}
3

Byte and Char give the same thing.

4

TheWitchHunter:
Byte and Char give the same thing.

And that would be ?

5

Something is missing here. The code in the OP will not compile. Data is not defined in the scope of loop function.

6

It should not even compile. Data is declared in setup and not in loop.

void loop()
{
  int data;
  if(Serial.available() > 0)
  {
    data = Serisl.read();
    Serisl.println(data);
  }
}

You can remove Data from setup.

7

ieee488:
And that would be ?

-1 repeating

sterretje:
It should not even compile. Data is declared in setup and not in loop.

void loop()

{
  int data;
  if(Serial.available() > 0)
  {
    data = Serisl.read();
    Serisl.println(data);
  }
}




You can remove Data from setup.

Thanks that fixed it, though I ended up doing something different for my project.

8

Have a look at Serial Input Basics

...R