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Password based door locking system, uses Matrix keypad to enter the password, This project is extended to operate on IR Remote RC-604, In this project all required data is given Circuit diagram, C code, PCB design and All related data, This project is based on AVR Atmega8 Microcontroller.
Features:
1. You can enter password through Keypad or IR Remote
2. Low Cost
3. Simple to design
4. Operates Two relays One for Buzzer and Another for Operating Motor
Step 1: Major Components Required
1. Atmega 8 Microcontroller
2. Relays, Switches
2. Relays, Switches
3. 4×3 Keypad Matrix
4. LM7805
5. BC548
6. 16×2 LCD Display
4. LM7805
5. BC548
6. 16×2 LCD Display
7. Buy Components from our Store www.circuits4you.com
Step 2: Circuit Design and PCB Manufacturing
Download Requires Files
1. Download Proteus Simulation Circuit Diagram (you can try proteus simulation of this project)
Download Requires Files
1. Download Proteus Simulation Circuit Diagram (you can try proteus simulation of this project)
2. Download pdf PCB Layout
3. Assemble components using above files.
AVR Studio C Code
#include <avr/io.h>
#include <string.h>
#include <avr/eeprom.h>
#include <avr/interrupt.h>
#include "remote.h"
unsigned char u8_data;
//LCD connections
#define E PD7
#define RS PB0
#define Relay PB3 //Relay1
#define Relay1 PB4 //Relay1
//Decleration
void display(char string[16]);
void displaybyte(char D);
void dispinit(void);
void cleardisplay(void);
void line1(void);
void line2(void);
void epulse(void);
void delay_ms(unsigned int de);
void PasswordNotOK();
void PasswordNotOK1();
char KeyCheck();
char mystr[6];
char Password[3];
int main(void)
{
DDRB = 0b00011011; //LCD port direction
DDRD = 0b11011001; //LCD port direction
DDRC = 0b00011010; //Key Pad
PORTC= 0b11111111; //Activate internal pullups for keypad
PORTD |=(1<<PD1);
// PORTB |=(1<<Relay);
delay_ms(500); //Initiaize LCD
dispinit();
delay_ms(200);
line1();
uint8_t cmd=0;
RemoteInit();
display(" Password ");
line2();
display(" Access ");
cleardisplay();
line1();
char Key,cnt;
cnt=0;
Key=KeyCheck();
if(Key==11)
{
//Get Old Password
line1();
display("Enter Old Pass: ");
line2();
cnt=0;
while(1)
{
Key = KeyCheck();
//cmd=GetRemoteCmd(0);
//displaybyte(cmd+48);
delay_ms(100);
if((Key != 15) && (cnt<4) && (Key !=11) && (Key !=12))
{
//line1();
//displaybyte(Key+48); //Display Passsword
displaybyte(0x2A); //"*" Display '*' Instead of password
Password[cnt]=Key;
cnt++;
}
if(Key==11) //Cancel Key
{
cnt=0;
PasswordNotOK1();
}
if(((Key !=15)) && (cnt==4))
{
if(Key==12) //OK Key
{
//Verify password
if(eeprom_read_byte((uint8_t*)4)==Password[0])
{
if(eeprom_read_byte((uint8_t*)5)==Password[1])
{
if(eeprom_read_byte((uint8_t*)6)==Password[2])
{
if(eeprom_read_byte((uint8_t*)7)==Password[3])
{
//PasswordOK
cleardisplay();
line1();
display(" Enter New ");
line2();
display("Password:");
while(1)
{
Key = KeyCheck();
delay_ms(100);
if((Key != 15) && (cnt<4))
{
//line1();
displaybyte(Key+48);
Password[cnt]=Key;
cnt++;
}
if((Key !=15) && (cnt==4))
{
if(Key==12) //OK Key
{
cleardisplay();
line1();
display("Password Changed");
eeprom_write_byte((uint8_t*)4,Password[0]);
eeprom_write_byte((uint8_t*)5,Password[1]);
eeprom_write_byte((uint8_t*)6,Password[2]);
eeprom_write_byte((uint8_t*)7,Password[3]);
delay_ms(2000);
cleardisplay();
break;
}
if(Key==11) //Cancel Key
{
cleardisplay();
break;
}
}
}
//}
//=========
cleardisplay();
line1();
display("Enter Password:");
line2();
cnt=0;
}
else
{
cnt=0;
//PORTB |= (1<<Relay1);
PasswordNotOK1();
}
}
else
{
cnt=0;
//PORTB |= (1<<Relay1);
PasswordNotOK1();
}
}
else
{
cnt=0;
//PORTB |= (1<<Relay1);
PasswordNotOK1();
}
}
else
{
cnt=0;
//PORTB |= (1<<Relay1);
PasswordNotOK1();
}
}
if(Key==11) //Cancel Key
{
cleardisplay();
line1();
display("Enter Old Pass: ");
line2();
cnt=0;
}
}
}
}
//----------------
line1();
display("Enter Password:");
line2();
cnt=0;
while(1)
{
Key = KeyCheck();
cmd=GetRemoteCmd(0);
//displaybyte(cmd+48);
delay_ms(100);
if((cnt<4) && (cmd !=10) && (cmd !=25) && (cmd !=255))
{
//line1();
//displaybyte(cmd+48);
displaybyte(0x2A); //"*"
Password[cnt]=cmd;
cnt++;
}
if((Key != 15) && (cnt<4) && (Key !=11) && (Key !=12))
{
//line1();
//displaybyte(Key+48);
displaybyte(0x2A); //"*"
Password[cnt]=Key;
cnt++;
}
if(Key==11 || cmd==10) //Cancel Key
{
cnt=0;
PasswordNotOK();
}
if(((Key !=15) || (cmd==25)) && (cnt==4))
{
if(Key==12 || cmd==25) //OK Key
{
//Verify password
if(eeprom_read_byte((uint8_t*)4)==Password[0])
{
if(eeprom_read_byte((uint8_t*)5)==Password[1])
{
if(eeprom_read_byte((uint8_t*)6)==Password[2])
{
if(eeprom_read_byte((uint8_t*)7)==Password[3])
{
//PasswordOK
cleardisplay();
PORTB |=(1<<Relay);
line1();
display("Open The Door");
delay_ms(4000);
cleardisplay();
//Operate Relay
PORTB &=~(1<<Relay);
line1();
display("Enter Password:");
line2();
cnt=0;
}
else
{
cnt=0;
PORTB |= (1<<Relay1);
PasswordNotOK();
}
}
else
{
cnt=0;
PORTB |= (1<<Relay1);
PasswordNotOK();
}
}
else
{
cnt=0;
PORTB |= (1<<Relay1);
PasswordNotOK();
}
}
else
{
cnt=0;
PORTB |= (1<<Relay1);
PasswordNotOK();
}
}
if(Key==11) //Cancel Key
{
cleardisplay();
line1();
display("Enter Password:");
line2();
cnt=0;
}
}
}
}
void PasswordNotOK()
{
cleardisplay();
line1();
display(" Incorrect ");
line2();
display(" Password ");
delay_ms(2000);
cleardisplay();
line1();
display("Enter Password:");
line2();
PORTB &=~ (1<<Relay1);
}
void PasswordNotOK1()
{
cleardisplay();
line1();
display(" Incorrect ");
line2();
display(" Password ");
delay_ms(2000);
cleardisplay();
line1();
display("Enter Old Pass: ");
line2();
}
char KeyCheck()
{
char KeyCode;
KeyCode=15;
//Scan 1
PORTC &=~(1<<PC1);
PORTC |=(1<<PC3);
PORTC |=(1<<PC4);
PORTD |=(1<<PD0);
if((PIND & 0x02)==0x00)
{
KeyCode=3;
while((PIND & 0x02)==0x00);
}
if((PINC & 0x04)==0x00)
{
KeyCode=2;
while((PINC & 0x04)==0x00);
}
if((PINC & 0x20)==0x00)
{
KeyCode=1;
while((PINC & 0x20)==0x00);
}
//Scan 2
PORTC |=(1<<PC1);
PORTC &=~(1<<PC3);
PORTC |=(1<<PC4);
PORTD |=(1<<PD0);
if((PIND & 0x02)==0x00)
{
KeyCode=6;
while((PIND & 0x02)==0x00);
}
if((PINC & 0x04)==0x00)
{
KeyCode=5;
while((PINC & 0x04)==0x00);
}
if((PINC & 0x20)==0x00)
{
KeyCode=4;
while((PINC & 0x20)==0x00);
}
//Scan 3
PORTC |=(1<<PC1);
PORTC |=(1<<PC3);
PORTC &=~(1<<PC4);
PORTD |=(1<<PD0);
if((PIND & 0x02)==0x00)
{
KeyCode=9;
while((PIND & 0x02)==0x00);
}
if((PINC & 0x04)==0x00)
{
KeyCode=8;
while((PINC & 0x04)==0x00);
}
if((PINC & 0x20)==0x00)
{
KeyCode=7;
while((PINC & 0x20)==0x00);
}
//Scan 4
PORTC |=(1<<PC1);
PORTC |=(1<<PC3);
PORTC |=(1<<PC4);
PORTD &=~(1<<PD0);
if((PIND & 0x02)==0x00)
{
KeyCode=12;
while((PIND & 0x02)==0x00);
}
if((PINC & 0x04)==0x00)
{
KeyCode=0;
while((PINC & 0x04)==0x00);
}
if((PINC & 0x20)==0x00)
{
KeyCode=11;
while((PINC & 0x20)==0x00);
}
return KeyCode;
}
void display(char string[16])
{
int len,count;
len = strlen(string);
for (count=0;count<len;count++)
{
displaybyte(string[count]);
}
}
void displaybyte(char D)
{
char D1;
D1=D;
D1=D1 & 0xF0;
D1=D1 >> 4; //Send MSB
PORTD = PORTD & (0b10100011);
PORTB = PORTB & (0b11111101);
PORTD |= ((D1 & 0x01) << 6);
//PORTD |= ((D1 & 0x02) << 1);
PORTB |= ((D1 & 0x02));
PORTD |= ((D1 & 0x04) << 2);
PORTD |= (D1 & 0x08);
epulse();
D1=D;
D1=D1 & 0x0F; //Send LSB
PORTD = PORTD & (0b10100011);
PORTB = PORTB & (0b11111101);
PORTD |= ((D1 & 0x01) << 6);
//PORTD |= ((D1 & 0x02) << 1);
PORTB |= ((D1 & 0x02));
PORTD |= ((D1 & 0x04) << 2);
PORTD |= (D1 & 0x08);
epulse();
}
void dispinit(void)
{
int count;
char init[]={0x43,0x03,0x03,0x02,0x28,0x01,0x0C,0x06,0x02,0x02};
PORTB &= ~(1<<RS); // RS=0
for (count = 0; count <= 9; count++)
{
displaybyte(init[count]);
}
PORTB |= 1<<RS; //RS=1
}
void cleardisplay(void)
{
PORTB &= ~(1<<RS); // RS=0
displaybyte(0x01);
PORTB |= 1<<RS; //RS=1
}
void line1(void)
{
PORTB &= ~(1<<RS); // RS=0
displaybyte(0x80);
PORTB |= 1<<RS; //RS=1
}
void line2(void)
{
PORTB &= ~(1<<RS); // RS=0
displaybyte(0xC0);
PORTB |= 1<<RS; //RS=1
}
void epulse(void)
{
PORTD |= 1<<E;
delay_ms(1);
PORTD &= ~(1<<E);
delay_ms(1);
}
void delay_ms(unsigned int de)
{
unsigned int rr,rr1;
for (rr=0;rr<de;rr++)
{
for(rr1=0;rr1<700;rr1++) //395
{
asm("nop");
}
}
}
Step 5: Test the code and Hardware
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2. You Did it Yourself
3. Refer Tutorials from this site for more understanding of code and Circuits
4. Please comment if you have any trouble, Its Tested code
For more Detail: Password based door locking system
About The Author
Ibrar Ayyub
Ibrar Ayyub is an experienced technical writer with a Master's degree in computer science from BZU Multan University. He has written for various industries, mainly home automation, and engineering. He has a clear and simple writing style and is skilled in using infographics and diagrams. He is a great researcher and is able to present information in a well-organized and logical manner.