Clear data in Serial.read()

Question

I am programming an Arduino to turn a LED on when it receives something in the serial port. I have done this and it has received the data but after the LED should have been turned off it keeps going. Here is my current code:

int ledPin = 13;

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  if(Serial.available() > 0) {
    Serial.print("RECEIVED_CALL");
    digitalWrite(ledPin, HIGH);
    delay(4500);
    digitalWrite(ledPin, LOW);
    Serial.clear();
  }
}

Please leave any suggestions.

Answer 1

Add some debugging statements (like Serial.print("LED_OFF") ) to be sure that your Arduino is not restarting upon receiving serial data as described in my post here .

This may account for the light staying on. It may be restarting over and over again if you are sending enough serial data.