아두이노 LED 원격 제어하기(코드)

#define LED_PIN 12

String buff = ""; // Serial read buff
bool state_error = false; // error 
void setup() {
  pinMode( LED_PIN, OUTPUT );
  digitalWrite(LED_PIN, LOW);  // LED OFF   
  Serial.begin(9600);
}

void loop() {
  if( state_error ){  
    digitalWrite(LED_PIN, HIGH);  // LED ON        
    delay( 500 );
    digitalWrite(LED_PIN, LOW);  // LED OFF   
    delay( 500 );
  }
}

void serialEvent(){
  char c = (char)Serial.read();
  buff += c;
  if(c == '\r'){
    if(buff == "ON\r"){
      state_error = false;
      digitalWrite(LED_PIN, HIGH);  // LED ON
    }else if(buff == "OFF\r"){
      state_error = false;
      digitalWrite(LED_PIN, LOW);  // LED OFF
    }else{
      state_error = true;
    }
    buff = "";
  }
}

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https://koa-rea.tistory.com/37

아두이노 LED 원격 제어하기