Loop running twice

Projects Programming
1

For loope is supposed to run once but make it twice.
What am I doing wrong?

See the attachment.

2

I see no attachment so we cannot help you, please post the code.

do not foget to use code tags...

3

Me too.
This is the code:

char incomingByte = 0;

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

void loop() {

if (Serial.available() > 0) {
incomingByte = Serial.read();
Serial.print("I received: ");
Serial.println(incomingByte);
}
}

am when I type smth it shows this:

I received: f
I received:

I'm asking why does I received twice and how can I correct it.

4

I expect you have newline selected as the line ending in the serial monitor. Try setting it to no line ending.

5

Thank you, that was the problem:)