// ATtiny85 sleep mode, wake on pin change interrupt demo
// Author: Nick Gammon
// Date: 12 October 2013

// ATMEL ATTINY 25/45/85 / ARDUINO
//
//                  +-\/-+
// Ain0 (D 5) PB5  1|    |8  Vcc
// Ain3 (D 3) PB3  2|    |7  PB2 (D 2) Ain1
// Ain2 (D 4) PB4  3|    |6  PB1 (D 1) pwm1
//            GND  4|    |5  PB0 (D 0) pwm0
//                  +----+

#include <avr/sleep.h>    // Sleep Modes
#include <avr/power.h>

const byte LED1 = 3;  // pin 2
const byte LED2 = 1;  // pin 2
const byte SWITCH = 4; // pin 3 / PCINT4

 
void setup ()
  {
  pinMode (LED1, OUTPUT);
  pinMode (LED2, OUTPUT);
  pinMode (SWITCH, INPUT);
 // digitalWrite (SWITCH, HIGH);  // internal pull-up
  }  // end of setup

void loop ()
  {
    if(digitalRead(SWITCH) == 1){
      digitalWrite (LED1, HIGH);
      for(int i = 0;i<40;i++){
        delay(150);
        if(digitalRead(SWITCH) == 0) break;
      }
      digitalWrite (LED1, LOW);
      digitalWrite (LED2, HIGH);
      for(int i = 0;i<20;i++){
        delay(150);
        if(digitalRead(SWITCH) == 0) break;
      } 
      digitalWrite (LED2, LOW);
    }
  
 
  }  // end of loop
ATTINY8520PU