#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#include "pitches.h"
#include "DHT.h"

#define DHTPIN 29
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);  

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

int led_state;
volatile int pir_1_state;
volatile int pir_2_state;

int mute_butt=40;

unsigned long currentMillis_sec_1 = 0;
unsigned long prev_millis_sec_1 = 0;
unsigned long period_sec_1 = 100; 

unsigned long currentMillis_sec_2 = 0;
unsigned long prev_millis_sec_2 = 0;
unsigned long period_sec_2 = 100; 

unsigned long start_count_1;
unsigned long start_count_2;

unsigned long dect_time_1;
unsigned long dect_time_2;
unsigned long diff_sens;

int pir_1_read_stat=0;
int pir_1_prev_read_stat=0;

int pir_2_read_stat=0;
int pir_2_prev_read_stat=0;

int pin_led_green=5;
int pin_led_red=6;
int pin_led_yellow=7;

int pir_sec_1=51;
int pir_sec_2=53;

int reset_button=23;

int alarm_switch_1=22;
int alarm_switch_2=24;

int pot_pin=A8;
int SPEAKER_PIN=13;

const int Tones[] ={
  NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4,
  NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5
};


LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


void setup() {
  Serial.begin(9600);
   dht.begin();

  pinMode(SPEAKER_PIN, OUTPUT);

  pinMode(pin_led_green,OUTPUT);
  pinMode(pin_led_red,OUTPUT);
  pinMode(pin_led_yellow,OUTPUT);

  pinMode(pot_pin,INPUT);

  pinMode(pir_sec_1,INPUT);
  pinMode(pir_sec_2,INPUT);

  pinMode(reset_button,INPUT);

  pinMode(alarm_switch_1,INPUT);
  pinMode(alarm_switch_2,INPUT);

  lcd.init();
  lcd.backlight();
 
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.setCursor(8, 0);
  lcd.print("MODE: ");
  lcd.setCursor(10, 1);
  lcd.print("MOTION IN: ");

  noTone(SPEAKER_PIN);
  
 
}

void pot_read(){
  
period_sec_1=period_sec_2=map(analogRead(pot_pin),0,1023,1,10)*1000;
  lcd.setCursor(6, 0);
  lcd.print(" ");
  lcd.setCursor(5, 0);
  lcd.print(period_sec_1/1000);

}

void alarms_spound() {
  for (int i=0; i<=7; i++){
    tone(SPEAKER_PIN, Tones[i]);
      delay(15);
      noTone(SPEAKER_PIN);}

     for (int i=7; i<=0; i--){
    tone(SPEAKER_PIN, Tones[i]);
      delay(15);
      noTone(SPEAKER_PIN);}  
    
}

void alarm_in_sec_1() {
    if (digitalRead(pir_sec_1)==HIGH) {
 //if (digitalRead(mute_butt)==0) {alarms_spound();}
        pir_1_state=1; start_count_1=millis();digitalWrite(pin_led_green,HIGH);
      if (digitalRead(alarm_switch_1)==HIGH){digitalWrite(pin_led_yellow,HIGH);}
      } 
    if (millis()-start_count_1>=period_sec_1 && pir_1_state==1) {
      digitalWrite(pin_led_green,LOW);
      digitalWrite(pin_led_yellow,LOW);
      pir_1_state=0;
    }

}

void alarm_in_sec_2() {
    if (digitalRead(pir_sec_2)==HIGH) {
//if (digitalRead(mute_butt)==0) {alarms_spound();}
      pir_2_state=1; start_count_2=millis();digitalWrite(pin_led_red,HIGH);
      if (digitalRead(alarm_switch_1)==HIGH){digitalWrite(pin_led_yellow,HIGH);}
      } 
    if (millis()-start_count_2>=period_sec_2 && pir_2_state==1) {
      digitalWrite(pin_led_red,LOW);
      digitalWrite(pin_led_yellow,LOW);
      pir_2_state=0;
    }
}
 
void reset_alarms(){
 if(digitalRead(reset_button)==HIGH) { 
  pir_1_state=0; 
  pir_2_state=0;
  digitalWrite(pin_led_red,LOW);
  digitalWrite(pin_led_yellow,LOW);
  digitalWrite(pin_led_green,LOW);}

}

void loop() {

  if (digitalRead(alarm_switch_1)==HIGH){
  lcd.setCursor(13, 0);
  lcd.print("BOTH   ");}
  else {
  lcd.setCursor(13, 0);
  lcd.print("SINGLE");}



pot_read();
alarm_in_sec_1();
alarm_in_sec_2();
reset_alarms();

 /* if (pir_1_state==1&&pir_2_state==1){lcd.setCursor(0, 2); lcd.print("SECTOR 1, SECTOR 2");} else{
  if (pir_1_state==1){lcd.setCursor(0, 2); lcd.print("SECTOR 1          ");}
  if (pir_2_state==1){lcd.setCursor(0, 2); lcd.print("SECTOR 2          ");}}
  if (pir_1_state==0&&pir_2_state==0){lcd.setCursor(0, 2); lcd.print("                  ");}*/

  if (digitalRead(pir_sec_1)==1&&digitalRead(pir_sec_2)==1){lcd.setCursor(0, 2); lcd.print("SECTOR 1, SECTOR 2");} else{
  if (digitalRead(pir_sec_1)==1){lcd.setCursor(0, 2); lcd.print("SECTOR 1          ");}
  if (digitalRead(pir_sec_2)==1){lcd.setCursor(0, 2); lcd.print("SECTOR 2          ");}}
  if (digitalRead(pir_sec_1)==0&&digitalRead(pir_sec_2)==0){lcd.setCursor(0, 2); lcd.print("                  ");}

if (pir_1_prev_read_stat==!digitalRead(pir_sec_1)&&digitalRead(pir_sec_1)==1){
    dect_time_1=millis();
    Serial.println(dect_time_1);
}
pir_1_prev_read_stat=digitalRead(pir_sec_1);

if (pir_2_prev_read_stat==!digitalRead(pir_sec_2)&&digitalRead(pir_sec_2)==1){
    dect_time_2=millis();
    Serial.println(dect_time_2);
}
pir_2_prev_read_stat=digitalRead(pir_sec_2);


 if (dect_time_1>=dect_time_2&&dect_time_1>0&&dect_time_2>0) {diff_sens=dect_time_1-dect_time_2;}  
 if (dect_time_1<dect_time_2&&dect_time_1>0&&dect_time_2>0)  {diff_sens=dect_time_2-dect_time_1;}
diff_sens=diff_sens/1000;

lcd.setCursor(0, 1);
lcd.print("D:");
if (diff_sens>0) {lcd.print(diff_sens);}

if (digitalRead(pir_sec_1)==0){dect_time_1=0; lcd.setCursor(0, 1);lcd.print("D:   ");}
if (digitalRead(pir_sec_2)==0){dect_time_2=0;lcd.setCursor(0, 1);lcd.print("D:   ");}



lcd.setCursor(0, 3);
lcd.print("T:");
lcd.setCursor(2, 3);
lcd.print(dht.readTemperature());
lcd.print("C");

lcd.setCursor(12, 3);
lcd.print("H:");
lcd.setCursor(14, 3);
lcd.print(dht.readHumidity());
lcd.print("%");




}