Keypad Entry Lock

An up to six digit number code that enables you to unlock a secret container.

Apr 10, 2019

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keypad

lock

door

Components and supplies

5 mm LED: Green

Breadboard (generic)

Arduino UNO

9V battery (generic)

keypad

Jumper wires (generic)

SG90 Micro-servo motor

5 mm LED: Red

Resistor 220 ohm

Project description

Code

c_cpp

1#include <Servo.h>
2#include <Keypad.h>
3
4Servo ServoMotor;
5char*   password = "427";  // change the password here, just pick any 3 numbers
6int   position = 0;
7const byte ROWS = 4;
8const byte COLS = 4;
9char keys[ROWS][COLS]   = {
10{'1','2','3','A'},
11{'4','5','6','B'},
12{'7','8','9','C'},
13{'*','0','#','D'}
14};
15
16byte   rowPins[ROWS] = { 8, 7, 6, 9 };
17byte colPins[COLS] = { 5, 4, 3, 2 };
18Keypad   keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
19int RedpinLock   = 12;
20int GreenpinUnlock = 13;
21
22void setup()
23{
24pinMode(RedpinLock,   OUTPUT);
25pinMode(GreenpinUnlock, OUTPUT);
26ServoMotor.attach(11);
27LockedPosition(true);
28}
29
30void   loop()
31{
32char key = keypad.getKey();
33if (key == '*' || key == '#')
34{
35position   = 0;
36LockedPosition(true);
37}
38if (key == password[position])
39{
40position   ++;
41}
42if (position == 3)
43{
44LockedPosition(false);
45}
46delay(100);
47}
48void   LockedPosition(int locked)
49{
50if (locked)
51{
52digitalWrite(RedpinLock,   HIGH);
53digitalWrite(GreenpinUnlock, LOW);
54ServoMotor.write(11);
55}
56else
57{
58digitalWrite(RedpinLock,   LOW);
59digitalWrite(GreenpinUnlock, HIGH);
60ServoMotor.write(90);
61}
62}

#include <Servo.h>
#include <Keypad.h>

Servo ServoMotor;
char*   password = "427";  // change the password here, just pick any 3 numbers
int   position = 0;
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS]   = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};

byte   rowPins[ROWS] = { 8, 7, 6, 9 };
byte colPins[COLS] = { 5, 4, 3, 2 };
Keypad   keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
int RedpinLock   = 12;
int GreenpinUnlock = 13;

void setup()
{
pinMode(RedpinLock,   OUTPUT);
pinMode(GreenpinUnlock, OUTPUT);
ServoMotor.attach(11);
LockedPosition(true);
}

void   loop()
{
char key = keypad.getKey();
if (key == '*' || key == '#')
{
position   = 0;
LockedPosition(true);
}
if (key == password[position])
{
position   ++;
}
if (position == 3)
{
LockedPosition(false);
}
delay(100);
}
void   LockedPosition(int locked)
{
if (locked)
{
digitalWrite(RedpinLock,   HIGH);
digitalWrite(GreenpinUnlock, LOW);
ServoMotor.write(11);
}
else
{
digitalWrite(RedpinLock,   LOW);
digitalWrite(GreenpinUnlock, HIGH);
ServoMotor.write(90);
}
}

Code

c_cpp

1#include <Servo.h>
2#include <Keypad.h>
3
4Servo ServoMotor;
5char*  password = "427";  // change the password here, just pick any 3 numbers
6int  position = 0;
7const byte ROWS = 4;
8const byte COLS = 4;
9char keys[ROWS][COLS]  = {
10{'1','2','3','A'},
11{'4','5','6','B'},
12{'7','8','9','C'},
13{'*','0','#','D'}
14};
15
16byte  rowPins[ROWS] = { 8, 7, 6, 9 };
17byte colPins[COLS] = { 5, 4, 3, 2 };
18Keypad  keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
19int RedpinLock  = 12;
20int GreenpinUnlock = 13;
21
22void setup()
23{
24pinMode(RedpinLock,  OUTPUT);
25pinMode(GreenpinUnlock, OUTPUT);
26ServoMotor.attach(11);
27LockedPosition(true);
28}
29
30void  loop()
31{
32char key = keypad.getKey();
33if (key == '*' || key == '#')
34{
35position  = 0;
36LockedPosition(true);
37}
38if (key == password[position])
39{
40position  ++;
41}
42if (position == 3)
43{
44LockedPosition(false);
45}
46delay(100);
47}
48void  LockedPosition(int locked)
49{
50if (locked)
51{
52digitalWrite(RedpinLock,  HIGH);
53digitalWrite(GreenpinUnlock, LOW);
54ServoMotor.write(11);
55}
56else
57{
58digitalWrite(RedpinLock,  LOW);
59digitalWrite(GreenpinUnlock, HIGH);
60ServoMotor.write(90);
61}
62}

#include <Servo.h>
#include <Keypad.h>

Servo ServoMotor;
char*  password = "427";  // change the password here, just pick any 3 numbers
int  position = 0;
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS]  = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};

byte  rowPins[ROWS] = { 8, 7, 6, 9 };
byte colPins[COLS] = { 5, 4, 3, 2 };
Keypad  keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
int RedpinLock  = 12;
int GreenpinUnlock = 13;

void setup()
{
pinMode(RedpinLock,  OUTPUT);
pinMode(GreenpinUnlock, OUTPUT);
ServoMotor.attach(11);
LockedPosition(true);
}

void  loop()
{
char key = keypad.getKey();
if (key == '*' || key == '#')
{
position  = 0;
LockedPosition(true);
}
if (key == password[position])
{
position  ++;
}
if (position == 3)
{
LockedPosition(false);
}
delay(100);
}
void  LockedPosition(int locked)
{
if (locked)
{
digitalWrite(RedpinLock,  HIGH);
digitalWrite(GreenpinUnlock, LOW);
ServoMotor.write(11);
}
else
{
digitalWrite(RedpinLock,  LOW);
digitalWrite(GreenpinUnlock, HIGH);
ServoMotor.write(90);
}
}

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