//Echoboard: Attiny44, button and LED
//In this code the duration of the Blink is set by the time the button is pressed.

int ledPin = PA7; //Set the LED pin
int ledState = LOW; //Set LED initial state
long ledStart = 0;  //Last time the LED was updated
long ledBlink = 1000;  //LED blink interval
int buttonPin = PA3;  //Set the button pin
int buttonState = HIGH; //Set the button initial state
long buttonPressTime = 0; //Time with the button pressed


void setup()
{
 pinMode(buttonPin, INPUT); //Set the button pin as an input
 pinMode(ledPin, OUTPUT); //Set the LED pin as an output
}

void loop()
{
 buttonState = digitalRead(buttonPin); //Read the state of the button pin
   if (buttonState==LOW && buttonPressTime==0) { //Check if the button is pressed
     buttonPressTime = millis();  //Check the time with the button pressed
   }
   if (buttonState==HIGH && buttonPressTime!=0) { //Check if the button is no longer pressed
     ledBlink = millis() - buttonPressTime;  //Sets the new interval for the blink from the subtraction of the execution time of the program minus the time with the button pressed
     buttonPressTime = 0;  //Reset the timer, ready for a new time reading
   }
   if (millis() - ledStart > ledBlink) { //Check if the time the button was pressed is less than the blink interval
     ledStart = millis(); //Update ledStart
     if (ledState == LOW) //Check if the previous ledState was LOW
       ledState = HIGH; //Set the new ledState on HIGH to blink ON
     else
       ledState = LOW; //Set the new ledState on LOW to blink OFF
     digitalWrite(ledPin, ledState); //Set the new ledState on the ledPin, blinking the LED
   }
}