Making an automated watering system with Arduino

I am trying to make an automated watering system using an Arduino.

Here is my wiring diagram: And here is my circuit wired up:

Here is the code that I'm using with Arduino. The code seems alright and the wiring on the Arduino seems okay as well, but I don't know where to place a speaker on the Arduino. The biggest problem is that the program doesn't run like I coded. After I uploaded this code to Arduino, the water pump just keeps running forever. Can anyone check up my code to make this run properly?

/**automated watering program **/

#include <avr/sleep.h>
#include <avr/wdt.h>
#define BEAT 300 // define time for the tone.
#define PINNO 12

int led = 13;

void setup() {
  // setup code to run once:
  pinMode(led, OUTPUT);
}

void loop() {
  // main code here, to run repeatedly:
  tone(PINNO,262,BEAT); // C(do)
  delay(BEAT);
  tone(PINNO,294,BEAT); // D(re)
  delay(BEAT);
  tone(PINNO,330,BEAT); // E(mi)
  delay(BEAT);
  tone(PINNO,262,BEAT); // C (do)
  delay(BEAT);
  tone(PINNO,294,BEAT); // D(re)
  delay(BEAT);
  tone(PINNO,330,BEAT); // E(mi)
  delay(BEAT);
  tone(PINNO,392,BEAT); // G(so)
  delay(BEAT);
  tone(PINNO,330,BEAT); // E(mi)
  delay(BEAT);
  tone(PINNO,294,BEAT); // D(re)
  delay(BEAT);
  tone(PINNO,262,BEAT); // C(do)
  delay(BEAT);
  tone(PINNO,294,BEAT); // D(re)
  delay(BEAT);
  tone(PINNO,330,BEAT); // E(mi)
  delay(BEAT);
  tone(PINNO,294,BEAT); // D(re)
  delay(BEAT);
  delay(1000); // Wait for 1 second
  digitalWrite(led,HIGH); //Make No. 11pin output HIGH = 5V
  delay(500); // Watering time
  digitalWrite(led,LOW); //Make No.11 pin output LOW = 0V
  // Shut down program to save battery using by watchdogtimer 24h standby mode
  int var = 0;
  while(var < 10800) {
    delayWDT(9); // 9seconds of shutdown
    var++; // 10800times repeat ＝24h
  }
}

void delayWDT(unsigned long t) {
  // delay excute while using powerdown mode
  delayWDT_setup(t); // watchdog timer setting
  ADCSRA &= ~(1 << ADEN); // ADEN bit clear and stop ADC
  set_sleep_mode(SLEEP_MODE_PWR_DOWN); // Powerdow mode
  sleep_enable();
  sleep_mode(); // sleep mode
  sleep_disable(); // WatchDog Timer times up and start working again
  ADCSRA |= (1 << ADEN); // turn on the ADC
}

void delayWDT_setup(unsigned int ii) {
  // setting up timer
  // 0=16ms, 1=32ms, 2=64ms, 3=128ms, 4=250ms, 5=500ms
  // 6=1sec, 7=2sec, 8=4sec, 9=8sec
  byte bb;
  if (ii > 9 ) {
    // get rid of strange numbers
    ii = 9;
  }
  bb =ii & 7;
  if (ii > 7) {
    bb |= (1 << 5);
  }
  bb |= ( 1 << WDCE );
  MCUSR &= ~(1 << WDRF); // MCU Status Reg. Watchdog Reset  Flag ->0
  // start timed sequence
  WDTCSR |= (1 << WDCE) | (1<<WDE); // allow to edit watchdog
  // set new watchdog timeout value
  WDTCSR = bb;
  WDTCSR |= _BV(WDIE);
}
ISR(WDT_vect) {
  // the work after time up, WDT
  //  wdt_cycle++;
}