//hold down a button to make the LED blink
//count the number of blinks
//release the button and send the number of blinks serialy to the computer

int led = 13;        //make a variable to hold the pin number the LED is connected to 
int button = 7;      //make a variable to hold the pin number the button is connected to
int count = 0;       //make a variable to hold the number of LED blinks
int buttonState = 0; //make a variable to keep track of the button state, 1 pressed, 0 released

void setup(){
  pinMode(button, INPUT);//set the button pin to input
  pinMode(led, OUTPUT);//set the led pin to output
  Serial.begin(9600);//initalize serial communication at 9600baud
  startBlink(); //call the start blink function to blink an led at the begining of the program

}


void loop(){
  if(digitalRead(button)==HIGH){//read the button pin, if the button is pressed and the pin is HIGH, then... 
    buttonState = 1;//keep track of the button state, 1 = presses
    digitalWrite(led, HIGH);// blink the LED by bringing it high
    delay(250);//wait 250ms
    digitalWrite(led, LOW);//bring the LED low
    delay(250);//wait 250ms
    count++;//increment the count by 1, ++ means add one to the variable
  }
  
  
  if((digitalRead(button)==LOW)  &&  (buttonState == 1)){//read the button pin. if the button pin is low and the the last time we read the button the state was 1 then... && is how we say and in a condional statement
    Serial.print("the LED has blinked ");//send the begining of a message out the serial port
    Serial.print(count);//send the LED count out the serial port
    Serial.print(" times. \n");//send the end of the message out the serial port followed by a new line, \n
    buttonState = 0;//reset the button state to 0
    count = 0;//reset the led blink count to 0
  }
}


//start blink function
void startBlink(){
  pinMode(led, OUTPUT);

  for(int i = 0; i < 4; i++){
    digitalWrite(led, HIGH);
    delay(250); 
    digitalWrite(led, LOW);
    delay(250);
  }
}