Serial.available

Projects Programming
1

I follow the example from arduino

int incomingByte = 0; // for incoming serial data

void setup() {
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
}

void loop() {

// reply only when you receive data:
if (Serial.available()) {
// read the incoming byte:
incomingByte = Serial.read();

// say what you got:
Serial.println(incomingByte);
}
}

but after I press "Enter"
I receive a 10

and if I type a number
I receive a number and a 10
15:57:53.769 -> 53
15:57:53.769 -> 10

how can I solve this?

2

but after I press "Enter"
I receive a 10

You have got the Line ending in the Serial monitor set to Newline. The ASCII code for Newline is 10. That is what you are seeing

3

If you want “echoing”, use serial.write(), instead of print.

4

I changed my serial monitor option to “No line ending” mode