/*
 * Copyright (C) 2022, Andrei Egorov
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

void setup() {
  pinMode(13, OUTPUT);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, OUTPUT);
  attachInterrupt(0, Time_Rec, RISING);
}

volatile boolean Tmp;

void loop() {
  digitalWrite(13,!digitalRead(13));
  delay(250);
}

void Time_Rec()
{
  Tmp = digitalRead(3);
  Tmp = !Tmp;
  digitalWrite(3, Tmp);
}