Serial port控制LED發光的作業

使用Serial Port透過Arduino Uno來控制LED的開關的作業。

Listing. Code

/**
 * Serial Library: Read 2 - Control LED
 */
int incomingByte = 0;
const int ledPin = 13;

void setup() {
  pinMode( ledPin, OUTPUT );
  Serial.begin( 9600 );
  Serial.println( "'L' turn on, 'l' turn off" );
}

void loop() {
  if( Serial.available() > 0 ) {
    incomingByte = Serial.read();
    
    // input 'L'
    if( incomingByte == 76 ) {
      Serial.println( "LED on!!" );
      digitalWrite( ledPin, HIGH );
    }
    // inpit 'l'
    if( incomingByte == 108 ) {
      Serial.println( "LED off!!" );
      digitalWrite( ledPin, LOW );
    }
  }
}