The Arduino Project

int ledPin = 13; 

int state = 0;

int flag = 0;

 

  void setup() {

 pinMode(ledPin, OUTPUT);

 digitalWrite(ledPin, LOW);

 

  Serial.begin(9600);}void loop() {

 if(Serial.available() > 0)

{
 state = Serial.read();
 flag=0;
 }

 if (state == '0') {
 digitalWrite(ledPin, LOW);
 if(flag == 0){
 Serial.println("LEDs: off");
 flag = 1;
 }
 }

 

 else if (state == '1') {
 digitalWrite(ledPin, HIGH);
 if(flag == 0){
 Serial.println("LED1: on");
 flag = 1;
 }
 }