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#include <EEPROM.h>
#include <LiquidCrystal.h>
#define _R digitalRead 
//định nghĩa chân ngoại vi
#define ok A1 
#define up A2 
#define down A0

LiquidCrystal lcd(12, 11, 7, 6, 5, 4);
unsigned int do_sau,muc_can,muc_day;
unsigned int home_setting=1,sel;
int muc_nuoc;
unsigned int key;
// home_setting: home=1,setting=0
//sel: 1: phone_num, 2: do_sau, 3: muc_day, 4: muc_can, 5: info,6: exit;
char phone_num[20],phone[20];
/*
 EEPROM:
 |---1---2---|---3--4---|---5--6---|
 |-độ-sâu-hồ-|--hồ-cạn--|--hồ-đầy--|
 |-------|
*/
void setup()
{
	//chế độ I/O
	pinMode(up, INPUT); 
	pinMode(ok, INPUT); 
	pinMode(down, INPUT);
    pinMode(13,OUTPUT);
	lcd.begin(20,4);
}

/* in chuoi ra man hinh lcd */
void lcd_string(unsigned int cot, unsigned int dong, String chuoi) 
{
	// đặt con trỏ vào cột, dòng
	lcd.setCursor(cot,dong);
	// In ra dong chu
	lcd.print(chuoi);
}

//đọc phím
int read_key()
{
	if(_R(ok))
	{
		while(_R(ok));
		return(1);
	}
	if(_R(up))
	{
		while(_R(up));
		return(2);
	}
	if(_R(down))
	{
		while(_R(down));
		return(3);
	}
	return(0);
}

unsigned int delay_read_key()
{
	// delay 1s
	for(int i=0; i< 100;i++)
	{
		key=read_key();
		if(key==1)
		{
			return(0);
			i=100;
		}
		else {delay(10);}
	}
    return(1);
}
	/* cai dat */
void setting()
{
	lcd.clear();
	lcd_string(0,0,"       SETTING      ");
	lcd_string(0,3,"Down:-  Ok:sel  Up:+");
	sel=0;
	int sel_term=1;
    int sel_last;
	while(home_setting==0)
	{
		key=read_key();
		if(key==1)		//ok
		{
			sel_last=sel_term;
			lcd_string(0,1,"                    ");
			lcd_string(0,2,"                    ");
			sel_term=0;
		}
		if(key==2)		//up
		{
			sel_term+=1;
			if(sel_term> 6) {sel_term=1;}
		}
		if(key==3)		//down
		{
			sel_term -=1;
			if(sel_term==0) {sel_term=6;}
		}
		switch(sel_term)
        {
        case 1:
			lcd_string(0,1,"=> Cai dat sdt      ");
			lcd_string(0,2,"   Do sau ho        ");
		break;
	 case 2:
			lcd_string(0,1,"=> Do sau ho        ");
			lcd_string(0,2,"   Muc canh bao tren");
		break;
		case 3:
			lcd_string(0,1,"=> Muc canh bao tren");
			lcd_string(0,2,"   Muc canh bao duoi");
		break;
		case 4:
			lcd_string(0,1,"=> Muc canh bao duoi");
			lcd_string(0,2,"   Thong tin        ");
		break;
		case 5:
			lcd_string(0,1,"=> Thong tin        ");
			lcd_string(0,2,"   Exit             ");
		break;
            case 6:
			lcd_string(0,1,"=> Exit             ");
			lcd_string(0,2,"   Cai dat sdt      ");
		break;
            }
		/* chọn chế độ */
        if(sel != sel_last)
		{
			sel=sel_last;
			switch(sel)
			{
				case 1:
					set_phone(10);
					sel_term=sel_last;
					sel= sel_last=0;
				break;
				case 2:
					set_do_sau();
					sel_term=sel_last;
					sel= sel_last=0;
				break;
				case 3:
					set_muc_day();
					sel_term=sel_last;
					sel= sel_last=0;
				break;
				case 4:
					set_muc_can();
					sel_term=sel_last;
				  sel= sel_last=0;  
				break;
				case 5:
					sel_term=sel_last ;
				   sel= sel_last=0;
					info();
				break;
				case 6:
					lcd_string(0,1,"    THOAT CAI DAT     ");
					delay(2000);
					sel_term=1;
					sel= sel_last=0;
					home_setting=1;
				break;
			}       
		}
	}
    if(home_setting==1)
    {
        eep_read_all();
        lcd.clear();
        lcd_string(0,0,"       HOME     "); 
    }
}

void set_do_sau()
{
	//lcd.clear();
	lcd_string(0,1,"Do sau cua ho: (cm) ");
	lcd_string(0,2,"                    ");
	//lcd_string(0,3,"Down:-  Ok:sel  Up:+");
	nhap_luu_so(1);
}

void set_muc_can()
{
	//lcd.clear();
	lcd_string(0,1,"Muc canh bao can(cm)");
	lcd_string(0,2,"                    ");
	//lcd_string(0,3,"Down:-  Ok:sel  Up:+");
	nhap_luu_so(3);
}

void set_muc_day()
{
	//lcd.clear();
	lcd_string(0,1,"Muc canh bao day(cm)");
	lcd_string(0,2,"                    ");
	//lcd_string(0,3,"Down:-  Ok:sel  Up:+");
	nhap_luu_so(5);
}

void nhap_luu_so(unsigned int vitri)
{
	unsigned int term=0;
	int x=1;
	while(x)
	{
		lcd.setCursor(0,2);
		lcd.print(term);
		if(_R(ok))
		{
			while(_R(ok));
			int term1 = term;
			eep_write_16b(term1,vitri);
			lcd_string(0,2,"    Da luu       ");
			delay(1000);
			x=0;
			break;
		}
		if(_R(up))
		{
			term++;
			delay(200);
		}
		if(_R(down))
		{
			term--;
			delay(200);
		}
		if(term > 400) {term=0;}
	}
}
	//chương trình con với EEPROM:
	/*ghi dữ liệu 16bit vào vị trí bất kì trong EEPROM */
void eep_write_16b(unsigned int dulieu,unsigned int vitri)
{
	unsigned int h,l;
	h=int(dulieu/256);
	l=int(dulieu%256);
	delay(5);
    EEPROM.write(vitri,h);
    delay(5);  
	EEPROM.write(vitri+1,l);
    delay(5);
}
	/*đọc dữ liệu 16bit từ vị trí bất kì trong EEPROM */
unsigned int eep_read_16(unsigned int vitri)
{
	unsigned int h,l,dulieu;
	delay(5);
    h=EEPROM.read(vitri);
    delay(5);  
	l=EEPROM.read(vitri+1);
    delay(5);
	dulieu=h*256+l;
	return(dulieu);
}

/* Infomation */
void info()
{
	lcd.clear();
	lcd_string(0,0,"     THONG  TIN     ");
	lcd_string(0,1,"  Thiet bi canh bao ");
	lcd_string(0,2,"       muc nuoc     ");
	lcd_string(0,3,"    Version 2.0.1   ");
	delay(2000);
}

void loop()
{
	if(home_setting==0)
        {
        setting();
        }
    if(home_setting==1)
	{
        lcd.clear();
        lcd_string(0,0,"       HOME     "); 
    
		while(home_setting)
		{
			muc_nuoc=water_lever();
			lcd_muc_nuoc(muc_nuoc);
			home_setting=delay_read_key();
		}
	}
}

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