const int led=12;
const int button_Pin=2;
//int lastbutton;
//int ledstate=LOW;
 
long lastTimeButtonStateChanged=millis();
long debounceDuration=50;
bool flag = true;

void setup() {
   pinMode(led, OUTPUT);
   pinMode(button_Pin, INPUT);
   //lastbtnstate=digitalRead(button_Pin);
   Serial.begin(9600);
   Serial.println("ENTER THE KEY O FOR ON AND X FOR OFF");
}

//void loop() {
//  if(millis()-lastTimeButtonStateChanged>=debounceDuration){
//    byte buttonstate=digitalRead(button_Pin);
//    if(buttonstate!=lastbtnstate){
//     lastbtnstate=buttonstate;
//     if(buttonstate==LOW){
//       if(ledstate==HIGH)
//         {
//           ledstate=LOW;
//         }
//         else{
//           ledstate=HIGH;
//         }
//         digitalWrite(led,ledstate);
//     }
//   }
void loop(){
      if(Serial.available()==1)
        {
          char var = Serial.read();
          if(var=='O'){
            Serial.println("Light ON");
            digitalWrite(led,HIGH);
            }
        
          if(var=='X'){
            Serial.println("light off");
            digitalWrite(led, LOW);
          }
            

          
          }
        
   //int buttonState = digitalRead(button_Pin);
if(millis()-lastTimeButtonStateChanged >= debounceDuration){
        //Serial.println(buttonState);
        lastTimeButtonStateChanged=millis();
    
    if(digitalRead(button_Pin)) {
      if(flag) {
          digitalWrite(led,!digitalRead(led));
          flag = false;
          }
        } 
        else {
              flag = true;
            }
     } 
}