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Design_for_simulation.ino
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Design_for_simulation.ino
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#include <LiquidCrystal.h> // Library for 16x2 LCD Display
const int rs = 8, en = 7, d4 = 6, d5 = 5, d6 = 4, d7 = 3; // initialize the library by associating any needed LCD interface pin with the IC pin number it is connected to
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
// Function declarations
int DTMF(); // Function to read a number key pressed using a DTMF Decoder
int PressAnyKey(); // Function to know if any key is pressed
char CorrectPasscode(); // Function to read next input (* or #) if user passcode matched to preset one
char Lock(); // Function to read # if user pressed it to lock the device
// Global variable declarations
int DTMFdata; // Initialize the DTMF data variable for decimal of 4 bit binary.
int DTMFvalue; // Variable to indicate the value of the actual key pressed
char DTMFvalue1; // Variable to indicate the value of the actual key pressed
char DTMFvalue2; // Variable to indicate the value of the actual key pressed
int StQ = 9; // DTMF Module StQ Pin connects to IC Digital Pin 9
int Q4 = 10; // DTMF Module Q4 Pin connects to IC Digital Pin 10
int Q3 = 11; // DTMF Module Q3 Pin connects to IC Digital Pin 11
int Q2 = 12; // DTMF Module Q2 Pin connects to IC Digital Pin 12
int Q1 = 13; // DTMF Module Q1 Pin connects to IC Digital Pin 13
int Passcode[4] = {0, 0, 0, 0}; // Array for storing the passcode
// void setup() starts
void setup()
{
lcd.begin(16, 2);
pinMode(Q1, INPUT); // Declaring the pinModes of other pins of the IC that is used
pinMode(Q2, INPUT); // Declaring the pinModes of other pins of the IC that is used
pinMode(Q3, INPUT); // Declaring the pinModes of other pins of the IC that is used
pinMode(Q4, INPUT); // Declaring the pinModes of other pins of the IC that is used
pinMode(StQ, INPUT); // Declaring the pinModes of other pins of the IC that is used
pinMode(2, OUTPUT); // Declaring the pinModes of other pins of the IC that is used
}
// void setup() ends
// void loop() starts
void loop()
{
// Variable declarations
int Entered_Passcode[4]; // Array to store the passcode input by user
int Any_Key = 0; // Variable used to acknowledge if any key was pressed
int Compare = 0; // Variable for comparison of user entered passcode
int i,j,k,l; // Variables for 'for loop'
char NextInput; // Variable to collect next input
int Lock1 = 2; // Variable storing digital pin number to which lock is connected
char LockInput; // Variable to collect # to lock device
// Variable declarations ends
// Idle Mode starts
// Code to print the idle mode display "Press any key_"
lcd.home();
lcd.print("Press any key");
// Code to print the idle mode display "Press any key_" ends
// Device leaving idle mode....
// If statement for unlocking or resetting the passcode starts
Any_Key = PressAnyKey();
delay(2000);
if(Any_Key == 1)
{
// LCD code to print "Enter the passcode:" on display
lcd.clear();
lcd.home();
lcd.print("Enter the pass:");
lcd.setCursor(0,1);
lcd.cursor();
// LCD code to print "Enter the passcode:" on display ends
// for loop to obtain passcode from user to Entered_Passcode variable
for(i=0 ; i<4 ; i++)
{
Entered_Passcode[i] = DTMF();
// Code to print "*" on display when a number is pressed
lcd.setCursor(i,1);
lcd.print('*');
delay(2000);
// Code to print "*" on display when a number is pressed ends
}
// for loop to obtain passcode from user to Entered_Passcode variable ends
// for loop to compare passcode from user to preset passcode
for(j=0 ; j<4 ; j++)
{
if(Passcode[j] == Entered_Passcode[j])
{
Compare++;
}
}
// for loop to compare passcode from user to preset passcode ends
// if statement to do further proceedings if the entered passcode is correct
if(Compare == 4)
{
// Code to print instructions on LCD and wait for next input
lcd.clear();
lcd.home();
lcd.noCursor();
lcd.print("Correct Passcode");
delay(2000);
lcd.clear();
lcd.home();
lcd.print("Press # - UNLOCK");
lcd.setCursor(1,1);
lcd.print("* - CHANGE PASS");
NextInput = CorrectPasscode();
delay(2000);
// Code to print instructions on LCD and wait for next input ends
switch(NextInput)
{
case '*':
// LCD code to enter new passcode
lcd.clear();
lcd.home();
lcd.print("Enter new pass:");
lcd.setCursor(0,1);
lcd.cursor();
for(k=0 ; k<4 ; k++)
{
Passcode[k] = DTMF();
// Code to print "*" on display when a number is pressed
lcd.setCursor(k,1);
lcd.print('*');
delay(2000);
// Code to print "*" on display when a number is pressed ends
}
lcd.clear();
lcd.home();
lcd.noCursor();
lcd.print("New passcode set");
for(l=0 ; l<4 ; l++)
{
lcd.setCursor(l,1);
lcd.print(Passcode[l]);
}
delay(2000);
// LCD code to enter new passcode ends
lcd.clear();
goto End;
break;
case '#':
// LCD code to unlock device
digitalWrite(Lock1, HIGH);
lcd.clear();
lcd.home();
lcd.print("UNLOCKED!");
delay(2000);
// LCD code to unlock device ends
// LCD code to lock device
lcd.clear();
lcd.home();
lcd.print("Press # to LOCK");
LockInput = Lock();
delay(2000);
if(LockInput == '#')
{
digitalWrite(Lock1, LOW);
}
lcd.clear();
lcd.home();
lcd.print("LOCKED!");
delay(2000);
// LCD code to lock device ends
lcd.clear();
goto End;
break;
}
}
// if statement to do further proceedings if the entered passcode is correct ends
// else statement to do further proceedings if the entered passcode is incorrect
else
{
lcd.clear();
lcd.home();
lcd.noCursor();
lcd.print("Wrong Passcode!");
delay(2000);
lcd.clear();
goto End;
}
// else statement to do further proceedings if the entered passcode is incorrect ends
}
// If statement for unlocking or resetting the passcode ends
End:
delay(0);
}
// void loop() ends
// DTMF Function Starts
int DTMF()
{
// IF StQ is High a DTMF tone is present. Check 4-bit code.
// While loop starts
while(1)
{
DTMFdata = 0;
DTMFvalue = '\0';
// If statement starts
if (digitalRead(StQ) == HIGH)
{
if (digitalRead(Q1) == HIGH) // If Q1 High add 1 to DTMFdata
{
DTMFdata = DTMFdata + 1;
}
if (digitalRead(Q2) == HIGH) // If Q2 High add 2 to DTMFdata
{
DTMFdata = DTMFdata + 2;
}
if (digitalRead(Q3) == HIGH) // If Q3 High add 4 to DTMFdata
{
DTMFdata = DTMFdata + 4;
}
if (digitalRead(Q4) == HIGH) // If Q4 High add 8 to DTMFdata
{
DTMFdata = DTMFdata + 8;
}
// decode 4-bit code. Which button was pressed?
// Switch statement starts
switch (DTMFdata)
{
case 0: //D
continue;
break;
case 1: //1
DTMFvalue = 1; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 2: //2
DTMFvalue = 2; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 3: //3
DTMFvalue = 3; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 4: //4
DTMFvalue = 4; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 5: //5
DTMFvalue = 5; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 6: //6
DTMFvalue = 6; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 7: //7
DTMFvalue = 7; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 8: //8
DTMFvalue = 8; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 9: //9
DTMFvalue = 9; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 10: //0
DTMFvalue = 0; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 11: //*
continue;
break;
case 12: //#
continue;
break;
case 13: //A
continue;
break;
case 14: //B
continue;
break;
case 15: //C
continue;
break;
}
// Switch statement ends
break; // To break the infinite while loop
}
// If statement ends
}
// While loop ends
return DTMFvalue; // Return the value stored in variable DTMFvalue
}
// DTMF Function ends
// PressAnyKey Function starts
int PressAnyKey()
{
// While loop starts
while(1)
{
// If statement starts
if (digitalRead(StQ) == HIGH)
{
break; // To break the infinite while loop
}
// If statement ends
}
// While loop ends
return (1); // Returns 1
}
// PressAnyKey Function ends
// CorrectPasscode Function Starts
char CorrectPasscode()
{
// IF StQ is High a DTMF tone is present. Check 4-bit code.
// While loop starts
while(1)
{
DTMFdata = 0;
DTMFvalue1 = '\0';
// If statement starts
if (digitalRead(StQ) == HIGH)
{
if (digitalRead(Q1) == HIGH) // If Q1 High add 1 to DTMFdata
{
DTMFdata = DTMFdata + 1;
}
if (digitalRead(Q2) == HIGH) // If Q2 High add 2 to DTMFdata
{
DTMFdata = DTMFdata + 2;
}
if (digitalRead(Q3) == HIGH) // If Q3 High add 4 to DTMFdata
{
DTMFdata = DTMFdata + 4;
}
if (digitalRead(Q4) == HIGH) // If Q4 High add 8 to DTMFdata
{
DTMFdata = DTMFdata + 8;
}
//decode 4-bit code. Which button was pressed?
// Switch statement starts
switch (DTMFdata)
{
case 0: //D
continue;
break;
case 1: //1
continue;
break;
case 2: //2
continue;
break;
case 3: //3
continue;
break;
case 4: //4
continue;
break;
case 5: //5
continue;
break;
case 6: //6
continue;
break;
case 7: //7
continue;
break;
case 8: //8
continue;
break;
case 9: //9
continue;
break;
case 10: //0
continue;
break;
case 11: //*
DTMFvalue1 = '*'; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 12: //#
DTMFvalue1 = '#'; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 13: //A
continue;
break;
case 14: //B
continue;
break;
case 15: //C
continue;
break;
}
// Switch statement ends
break; // To break the infinite while loop
}
// If statement ends
}
// While loop ends
return DTMFvalue1; // Return the value stored in variable DTMFvalue
}
// CorrectPasscode Function ends
// Lock Function Starts
char Lock()
{
// IF StQ is High a DTMF tone is present. Check 4-bit code.
// While loop starts
while(1)
{
DTMFdata = 0;
DTMFvalue2 = '\0';
// If statement starts
if (digitalRead(StQ) == HIGH)
{
if (digitalRead(Q1) == HIGH) // If Q1 High add 1 to DTMFdata
{
DTMFdata = DTMFdata + 1;
}
if (digitalRead(Q2) == HIGH) // If Q2 High add 2 to DTMFdata
{
DTMFdata = DTMFdata + 2;
}
if (digitalRead(Q3) == HIGH) // If Q3 High add 4 to DTMFdata
{
DTMFdata = DTMFdata + 4;
}
if (digitalRead(Q4) == HIGH) // If Q4 High add 8 to DTMFdata
{
DTMFdata = DTMFdata + 8;
}
//decode 4-bit code. Which button was pressed?
// Switch statement starts
switch (DTMFdata)
{
case 0: //D
continue;
break;
case 1: //1
continue;
break;
case 2: //2
continue;
break;
case 3: //3
continue;
break;
case 4: //4
continue;
break;
case 5: //5
continue;
break;
case 6: //6
continue;
break;
case 7: //7
continue;
break;
case 8: //8
continue;
break;
case 9: //9
continue;
break;
case 10: //0
continue;
break;
case 11: //*
continue;
break;
case 12: //#
DTMFvalue2 = '#'; // Setting the value of the actual key pressed to DTMFvalue variable
break;
case 13: //A
continue;
break;
case 14: //B
continue;
break;
case 15: //C
continue;
break;
}
// Switch statement ends
break; // To break the infinite while loop
}
// If statement ends
}
// While loop ends
return DTMFvalue2; // Return the value stored in variable DTMFvalue
}
// Lock Function ends