please help with my arduino

Question

My problem is when I run code like this:

char directioN;
void setup() { 
 Serial.begin(9600) 
}
void loop()
{
 if (Serial.available())
 {
 directioN = Serial.read();
 switch (directioN)
 {
 case 'F':
 break;
 case 'B':
 break;
 case 'R':
 break;
 case 'L':
 break;
 default :
 break;
 }
 Serial.print("direction is:");
 Serial.println(directioN);
 }
}

My serial monitor add another input, but the second one is empty; this happened here with char both as with int.

But when i tried the same code in tinkercad it worked fine.

So do I really need a new ATMEGA328 or it can be done by software or something?

**I use an Arduino Uno

• Juraj: what have you set in Serial Monitor as line ending to send?

Answer 1

So why you don't just ignore it?

if(directionN >= 32){ //check if char is readable ascii character
 Serial.print("direction is:");
 Serial.println(directioN);
} 

• nour albrmky: How i ignore. it affect how my code run cause a specific input do a specific function so the following zero or null input which im talking about here cause the wanted function to end
• Matej: @nouralbrmky Like in the code i posted, null input is probably newline.
• nour albrmky: It worked fine thank you .do u have any idea what may cause some thing like that to happen and i 'll be more thankful
• Matej: @nouralbrmky It's probably caused by newline character which is sent after text. Newline decimal value in ascii table is smaller than 32 and that's why this code ignores it.