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Embedded System Project : Keypad Lock
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Make a keypad lock with use of embedded system is easiest project for students. Keypad lock is the device which is provide security with password. It is a security device. This embedded system is useful in door lock, locker, and on other device which is protected by password.
Connection
Used elements for this project :-
1 Arduino board
4×4 or 3×4 Keypad
Cables
Here, This embedded software has total 8 cables which are connected to the Arduino board’s digital pins. Where 4 pins are supply the power in row and other 4 pins are supply in columns.
Note :- If you are doing this project by reference from our site than note it, you need to enter password from keypad not in serial monitor.
Source Code
#include <Keypad.h>
const int ROW_NUM = 4;
const int COLUMN_NUM = 4;
const String password = "8080";
String input_password;
char keys[ROW_NUM][COLUMN_NUM] =
{
{'1','2','3', 'A'},
{'4','5','6', 'B'},
{'7','8','9', 'C'},
{'*','0','#', 'D'}
};
byte pin_rows[ROW_NUM] = {9, 8, 7, 6};
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2};
Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
void setup()
{
Serial.begin(9600);
input_password.reserve(32);
}
void loop()
{
char key = keypad.getKey();
if (key)
{
Serial.println(key);
if(key == '*')
{
input_password = "";
}
else if(key == '#')
{
if(password == input_password)
{
Serial.println("password is correct");
}
else
{
Serial.println("password is incorrect, try again");
}
input_password = "";
}
else
{
input_password += key;
}
}
}
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I'm Harikrushna Sangani, a software engineer and the face behind IT Tutorials Cloud. I'm passionate about all things tech and love sharing my knowledge with you through easy-to-follow tutorials and tips. Join me on IT Tutorials Cloud to level up your coding skills and stay updated on the latest in the tech world. Let's learn together! Harikrushna Sangani
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