/* This code works with 4x4 Keypad Matrix, LCD ic, IRF510N transistor and a push button
* It's a lock where the transistor drives a solenoid lock you can open either with correct code
* or by the push button from inside
* The code can be changed directly by the keypad and doesn't require uploading code again
* Code is stored in EEPROM
* Refer to www.surtrtech.com for more details
*/
#include <Keypad.h>
#include <EEPROM.h>
#include <LiquidCrystal_I2C.h>
#define Solenoid 11 //Actually the Gate of the transistor that controls the solenoid
#define O_Button 10 //Push Button
LiquidCrystal_I2C lcd(0x27, 16, 2); //I2C adress, you should use the code to scan the adress first (0x27) here
//#define BACKLIGHT_PIN 3 // Declaring LCD Pins
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
const byte numRows= 4; //number of rows on the keypad
const byte numCols= 4; //number of columns on the keypad
char keymap[numRows][numCols]=
{
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
char keypressed; //Where the keys are stored it changes very often
char code[]= {'6','6','0','1'}; //The default code, you can change it or make it a 'n' digits one
char code_buff1[sizeof(code)]; //Where the new key is stored
char code_buff2[sizeof(code)]; //Where the new key is stored again so it's compared to the previous one
short a=0,i=0,s=0,j=0; //Variables used later
byte rowPins[numRows] = {2, 3, 4, 5};//Rows 0 to 3 //if you modify your pins you should modify this too
byte colPins[numCols]= {6,7,8,1}; //Columns 0 to 3
//LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);
void setup()
{
lcd.begin (16,2);
lcd.backlight();
lcd.setBacklight(HIGH); //Lighting backlight
lcd.home ();
lcd.print("Standby"); //What's written on the LCD you can change
pinMode(Solenoid,OUTPUT);
pinMode(O_Button,INPUT);
// for(i=0 ; i<sizeof(code);i++){ //When you upload the code the first time keep it commented
// EEPROM.get(i, code[i]); //Upload the code and change it to store it in the EEPROM
// } //Then uncomment this for loop and reupload the code (It's done only once)
}
void loop()
{
keypressed = myKeypad.getKey(); //Constantly waiting for a key to be pressed
if(keypressed == '*'){ // * to open the lock
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Enter code"); //Message to show
GetCode(); //Getting code function
if(a==sizeof(code)) //The GetCode function assign a value to a (it's correct when it has the size of the code array)
OpenDoor(); //Open lock function if code is correct
else{
lcd.clear();
lcd.print("Wrong"); //Message to print when the code is wrong
}
delay(2000);
lcd.clear();
lcd.print("Standby"); //Return to standby mode it's the message do display when waiting
}
if(keypressed == '#'){ //To change the code it calls the changecode function
ChangeCode();
lcd.clear();
lcd.print("Standby"); //When done it returns to standby mode
}
if(digitalRead(O_Button)==HIGH){ //Opening by the push button
digitalWrite(Solenoid,HIGH);
delay(3000); //Opens for 3s you can change
digitalWrite(Solenoid,LOW);
}
}
void GetCode(){ //Getting code sequence
i=0; //All variables set to 0
a=0;
j=0;
while(keypressed != 'A'){ //The user press A to confirm the code otherwise he can keep typing
keypressed = myKeypad.getKey();
if(keypressed != NO_KEY && keypressed != 'A' ){ //If the char typed isn't A and neither "nothing"
lcd.setCursor(j,1); //This to write "*" on the LCD whenever a key is pressed it's position is controlled by j
lcd.print("*");
j++;
if(keypressed == code[i]&& i<sizeof(code)){ //if the char typed is correct a and i increments to verify the next caracter
a++; //Now I think maybe I should have use only a or i ... too lazy to test it -_-'
i++;
}
else
a--; //if the character typed is wrong a decrements and cannot equal the size of code []
}
}
keypressed = NO_KEY;
}
void ChangeCode(){ //Change code sequence
lcd.clear();
lcd.print("Changing code");
delay(1000);
lcd.clear();
lcd.print("Enter old code");
GetCode(); //verify the old code first so you can change it
if(a==sizeof(code)){ //again verifying the a value
lcd.clear();
lcd.print("Changing code");
GetNewCode1(); //Get the new code
GetNewCode2(); //Get the new code again to confirm it
s=0;
for(i=0 ; i<sizeof(code) ; i++){ //Compare codes in array 1 and array 2 from two previous functions
if(code_buff1[i]==code_buff2[i])
s++; //again this how we verifiy, increment s whenever codes are matching
}
if(s==sizeof(code)){ //Correct is always the size of the array
for(i=0 ; i<sizeof(code) ; i++){
code[i]=code_buff2[i]; //the code array now receives the new code
EEPROM.put(i, code[i]); //And stores it in the EEPROM
}
lcd.clear();
lcd.print("Code Changed");
delay(2000);
}
else{ //In case the new codes aren't matching
lcd.clear();
lcd.print("Codes are not");
lcd.setCursor(0,1);
lcd.print("matching !!");
delay(2000);
}
}
else{ //In case the old code is wrong you can't change it
lcd.clear();
lcd.print("Wrong");
delay(2000);
}
}
void GetNewCode1(){
i=0;
j=0;
lcd.clear();
lcd.print("Enter new code"); //tell the user to enter the new code and press A
lcd.setCursor(0,1);
lcd.print("and press A");
delay(2000);
lcd.clear();
lcd.setCursor(0,1);
lcd.print("and press A"); //Press A keep showing while the top row print ***
while(keypressed != 'A'){ //A to confirm and quits the loop
keypressed = myKeypad.getKey();
if(keypressed != NO_KEY && keypressed != 'A' ){
lcd.setCursor(j,0);
lcd.print("*"); //On the new code you can show * as I did or change it to keypressed to show the keys
code_buff1[i]=keypressed; //Store caracters in the array
i++;
j++;
}
}
keypressed = NO_KEY;
}
void GetNewCode2(){ //This is exactly like the GetNewCode1 function but this time the code is stored in another array
i=0;
j=0;
lcd.clear();
lcd.print("Confirm code");
lcd.setCursor(0,1);
lcd.print("and press A");
delay(3000);
lcd.clear();
lcd.setCursor(0,1);
lcd.print("and press A");
while(keypressed != 'A'){
keypressed = myKeypad.getKey();
if(keypressed != NO_KEY && keypressed != 'A' ){
lcd.setCursor(j,0);
lcd.print("*");
code_buff2[i]=keypressed;
i++;
j++;
}
}
keypressed = NO_KEY;
}
void OpenDoor(){ //Lock opening function open for 3s
lcd.clear();
lcd.print("Welcome"); //With a message printed
digitalWrite(Solenoid,HIGH);
delay(3000);
digitalWrite(Solenoid,LOW);
}