I wrote following program, it receives 5 character input from user and if user enters input more than 5 characters then program store only 1st 5 characters and if user inputs less than 5 characters long the it rejects than input altogether..
char userInput[5];
void setup()
{
//delay(1000);
Serial.begin(9600); // begin serial port with baud rate 9600bps
}
void loop()
{
if (Serial.available() < 5)
{
Serial.read();
}
else if (Serial.available() >= 5)
{
for (int i = 0; i < 5; i++)
{
userInput[i] = Serial.read();
}
while (Serial.available() > 0)
{
Serial.read();
}
Serial.print("User Input - ");
Serial.println(userInput);
}
delay(100);
}
