Soap dispenser arduino nano r3

#include <avr/sleep.h>

/* Sleep Demo Serial
 * -----------------
 * Example code to demonstrate the sleep functions in an Arduino.
 *
 * use a resistor between RX and pin2. By default RX is pulled up to 5V
 * therefore, we can use a sequence of Serial data forcing RX to 0, what
 * will make pin2 go LOW activating INT0 external interrupt, bringing
 * the MCU back to life
 *
 * there is also a time counter that will put the MCU to sleep after 10 secs
 *
 * NOTE: when coming back from POWER-DOWN mode, it takes a bit
 *       until the system is functional at 100%!! (typically <1sec)
 *
 * Copyright (C) 2006 MacSimski 2006-12-30
 * Copyright (C) 2007 D. Cuartielles 2007-07-08 - Mexico DF
 *
 *  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 <https://www.gnu.org/licenses></1sec>.
 *
 */
int pumpPin = 8;
int wakePin = 2;     // pin used for waking up
int sleepStatus = 0; // variable to store a request for sleep
volatile int count = 0;       // counter
volatile bool triggered = false;   

void wakeUpNow() // here the interrupt is handled after wakeup
{
  if (triggered) {
    return;
  }
  triggered=true;
  count++;
  // execute code here after wake-up before returning to the loop() function
  // timers and code using timers (serial.print and more...) will not work here.
  // we don't really need to execute any special functions here, since we
  // just want the thing to wake up
}

void setup()
{
  pinMode(wakePin, INPUT);
  pinMode(pumpPin, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);

  Serial.begin(115200);

  /* Now it is time to enable an interrupt. In the function call
   * attachInterrupt(A, B, C)
   * A   can be either 0 or 1 for interrupts on pin 2 or 3.  
   *
   * B   Name of a function you want to execute while in interrupt A.
   *
   * C   Trigger mode of the interrupt pin. can be:
   *             LOW        a low level trigger
   *             CHANGE     a change in level trigger
   *             RISING     a rising edge of a level trigger
   *             FALLING    a falling edge of a level trigger
   *
   * In all but the IDLE sleep modes only LOW can be used.
   */
  // use interrupt 0 (pin 2) and run function
  // wakeUpNow when pin 2 gets LOW
  // attachInterrupt(digitalPinToInterrupt(wakePin), wakeUpNow, LOW);
  digitalWrite(pumpPin, LOW);
  digitalWrite(LED_BUILTIN, LOW);
}

void sleepNow() // here we put the arduino to sleep
{
  /* Now is the time to set the sleep mode. In the Atmega8 datasheet
     * https://www.atmel.com/dyn/resources/prod_documents/doc2486.pdf on page 35
     * there is a list of sleep modes which explains which clocks and
     * wake up sources are available in which sleep mode.
     *
     * In the avr/sleep.h file, the call names of these sleep modes are to be found:
     *
     * The 5 different modes are:
     *     SLEEP_MODE_IDLE         -the least power savings
     *     SLEEP_MODE_ADC
     *     SLEEP_MODE_PWR_SAVE
     *     SLEEP_MODE_STANDBY
     *     SLEEP_MODE_PWR_DOWN     -the most power savings
     *
     * For now, we want as much power savings as possible, so we
     * choose the according
     * sleep mode: SLEEP_MODE_PWR_DOWN
     *
     */
  set_sleep_mode(SLEEP_MODE_PWR_DOWN); // sleep mode is set here

  sleep_enable(); // enables the sleep bit in the mcucr register
                  // so sleep is possible. just a safety pin

  /* Now it is time to enable an interrupt. We do it here so an
     * accidentally pushed interrupt button doesn't interrupt
     * our running program. if you want to be able to run
     * interrupt code besides the sleep function, place it in
     * setup() for example.
     *
     * In the function call attachInterrupt(A, B, C)
     * A   can be either 0 or 1 for interrupts on pin 2 or 3.  
     *
     * B   Name of a function you want to execute at interrupt for A.
     *
     * C   Trigger mode of the interrupt pin. can be:
     *             LOW        a low level triggers
     *             CHANGE     a change in level triggers
     *             RISING     a rising edge of a level triggers
     *             FALLING    a falling edge of a level triggers
     *
     * In all but the IDLE sleep modes only LOW can be used.
     */
  // use interrupt 0 (pin 2) and run function
  // wakeUpNow when pin 2 gets LOW
  attachInterrupt(digitalPinToInterrupt(wakePin), wakeUpNow, FALLING);
  // here the device is actually put to sleep!!
  // THE PROGRAM CONTINUES FROM HERE AFTER WAKING UP
  // first thing after waking from sleep: disable sleep...
  sleep_mode();
  sleep_disable();
  // disables interrupt 0 on pin 2 so the
  // wakeUpNow code will not be executed
  // during normal running time.
  detachInterrupt(digitalPinToInterrupt(wakePin));
}

void loop()
{
 
  // sleep function called here
  sleepNow();
  bool bored = false;
  // Serial.println("sleep now");
  // delay(100);
  if (count > 1)
  {
    Serial.println("trigger pump");
    // trigger output 5v to pump
    digitalWrite(pumpPin, HIGH);
    delay(300);
    digitalWrite(pumpPin, LOW);
    // trong vong 2s tiep theo khong nhan tin hieu
  
    // wait for pin become low while user keep hand on sensor
  }
  delay(2000);
  triggered=false;
  // while (!bored)
  // {
  //   Serial.println("wait sensor off");
  //   delay(100);
  //   bored = digitalRead(wakePin) == HIGH;
  // }
}