//Using an LED, a resistor,  a pushbutton, arduino nano, in WokWi:
//		1. on one press of the button(Less than 2 seconds)
//  turns the LED ON if it is already off or OFF if it is already on
//		2. For a holding press greater than of 2 seconds, let it blink on and off repeatedly
// until the botton is pressed again

//Tip: 
//Utilise internal pullup resistor, and internal timer counter 
//using  pinMode(pin,INPUT_PULLUP), analogWrite(pin,VAL) and millis()

//Refer to arduino tutorial slides for assistance. 


const int ledPin = 10; // Pin to the LED
const int buttonPin = 9; // Pin to the pushbutton
int t1=0;                                                                                                                        
int a=0;
int state=1;
int blink=0;
unsigned long millTime = 0;
void setup() {
  Serial.begin(9600);

  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);

}

void loop() {

  unsigned long milsrtime = millis();
  while(digitalRead(buttonPin) == 0)
  {
    millTime = millis() - milsrtime;
  }
if ((millTime <2000 ) && (millTime>0)){// When the button is held down for less than two seconds
 
while(digitalRead(buttonPin)==1){
  if( digitalRead((ledPin)==HIGH))
    digitalWrite(ledPin,LOW);
  else
    digitalWrite(ledPin,HIGH);
  millTime=0;
  }
}

if (millTime>2000){
delay(100);

while(digitalRead(buttonPin)==1){
t1=millis();
while((millis()-t1<1000)&&(digitalRead(buttonPin)==1));
  digitalWrite(ledPin,HIGH);
 while((millis()-t1<2000)&&(digitalRead(buttonPin)==1));
  digitalWrite(ledPin,LOW);
  Serial.print(digitalRead(buttonPin));
  Serial.print(digitalRead(ledPin));
}
millTime=0;
}
millTime=0;
}