Here is the completed code although I have set the state to unlocked when the system starts now because I intend to have a rechargeable battery in the case the alarm will be housed in. If I were to run it without I would set the state to locked. I have added another pin for the capacitor charging but would stress the need for a large value resistor(I used 100k) for the capacitor.
/* This sketch uses a 16 key 4X4 analog keypad. The password is 1234 press #
to check the password. if correct the Red LED goes out and the Green Led comes on
to rearm the alarm press *
If when the system is in the disarmed state the C key is pressed both LED's light
and you can enter a new 4 digit password.
The sensor was triggering the alarm when armed from the unlocked state but was solved by using a capacitor to hold a small charge
which decays slowly when the alarm is set allowing the PIR sensor time to settle down.
*/
//Thank you Liudr for your guidance and help with the code.
// Your phi interface is a valuable set of tools.
#include <phi_interfaces.h>
#define buttons_per_column 16 // Each analog pin has five buttons with resistors.
#define buttons_per_row 1 // There are two analog pins in use.
byte keypad_type=Analog_keypad;
char mapping[]={
'1','2','3','A','4','5','6','B','7','8','9','C','*','0','#','D'}; // This is an analog keypad.
byte pins[]={
0}; // The pin numbers are analog pin numbers.
int values[]={
204,370,480,559,146,333,455,541,78,292,428,521,0,245,397,499}; //These numbers need to increase monotonically.
phi_analog_keypads panel_keypad(mapping, pins, values, buttons_per_row, buttons_per_column);
multiple_button_input* pad1=&panel_keypad;
// pin assignments
int speakerOut = 11;
int redLedpin = 12;
int greenLedpin = 10;
int alarmPin=3;
int capCharger=2;
int sensePin=A4;
int cap=A5;
int capVal;
// variables
char* inputString = "0000"; // holds the user input
char password[5] = "1234"; // holds the default correct password that can later be changed
int curpos = 0; // cursor position
int locked = 0; // status of the system: if locked = 1, if unlocked = 0
int motion;
long previousMillis = 0;
long interval = 10000;
int alarmPinstate = LOW;
void setup(){
Serial.begin(9600);
pinMode(sensePin,INPUT);// sensor
pinMode(speakerOut, OUTPUT);// keypad beeps and if passcode accepted tone
pinMode(redLedpin, OUTPUT);// system armed
pinMode(alarmPin,OUTPUT);
pinMode(greenLedpin, OUTPUT);//system dissarmed
pinMode(capCharger,OUTPUT);
/*
The cap charger will charge a capacitor that stops the PIR
sensor from showing an alert when setting the alarm.
The pir shows high when power is applied so the cap stops the
alarm triggering as soon as the alarm is powered on.
*/
}
void scanning(){
capVal=analogRead(cap);//This Has Fixed It
Serial.println (capVal);
motion=analogRead(sensePin);
//Serial.println(motion);// used for debugging
unsigned long startTime = 0;
unsigned long interval = 5000;
if ((locked==1)&&(motion>=500)&&(capVal<100)){// if the alarm is on read the sensor
if (startTime + interval < millis()) {
digitalWrite(alarmPin, HIGH);
}
}
else
{
digitalWrite (alarmPin, LOW);
}
}
void loop(){
if(locked ==1)//if the alarm is on
{
scanning();
digitalWrite(redLedpin, HIGH);
digitalWrite(capCharger,LOW);
digitalWrite(greenLedpin, LOW);
}
if(locked ==0)// if the alarm is off
{
digitalWrite(redLedpin, LOW);// if this pin is low the alarm will be off
digitalWrite(greenLedpin, HIGH);
digitalWrite(capCharger,HIGH);// this starts the capacitor charging
scanning();
}
// receive input from keypad
byte temp=panel_keypad.getKey();
if (temp != NO_KEY){ // a key is pressed
Serial.write(temp);
playKeyTone(); // play a beep to acknowledge that key pressed
switch(temp) // look for the special keys to initiate an event
{
case '#':
parseString(); // try unlock routine
curpos = 0;
break;
case '*': // lock the system
Serial.println("Armed");
locked = 1;
clearPassword(); // clear the password so that user needs to enter 4 digits again before unlocking
curpos = 0; // set cursor back to start of 4 digits
break;
case 'C':
changePassword(); // change password routine
curpos = 0;
break;
}
if(temp != '*' && temp != '#' && temp != 'C')
{
inputString[curpos] = temp; // if the key was none of the above three special ones, add the digit to the password string
curpos = curpos + 1; // move cursor to next position
}
if(curpos > 3) // if the cursor has reached the end of 4 digits, return it to the start
{
curpos = 0;
}
}
}
void playKeyTone(){ // beep key press
int elapsedtime = 0;
while (elapsedtime < 100)
{
digitalWrite(speakerOut,HIGH);
delayMicroseconds(500);
digitalWrite(speakerOut, LOW);
delayMicroseconds(500);
elapsedtime++;
}
}
void playWarningTone(){ // long beep for wrong password
int elapsedtime = 0;
while (elapsedtime < 200)
{
digitalWrite(speakerOut,HIGH);
delayMicroseconds(1000);
digitalWrite(speakerOut, LOW);
delayMicroseconds(1000);
elapsedtime++;
}
}
void playSuccessTone(){ // short beep for correct password
int elapsedtime = 0;
while (elapsedtime < 10)
{
digitalWrite(speakerOut,HIGH);
delayMicroseconds(1000);
digitalWrite(speakerOut, LOW);
delayMicroseconds(1000);
digitalWrite(speakerOut,HIGH);
delayMicroseconds(1000);
digitalWrite(speakerOut, LOW);
delayMicroseconds(1000);
elapsedtime++;
}
}
void parseString() // parse password to see if it matches
{
Serial.println("Code Entered");
Serial.println(inputString);
if(matchString(password, inputString) == 1) // did they match?
{
Serial.println("SYSTEM IS OFF. PRESS * TO ARM");
locked = 0; // correct code entered, unlock system
playSuccessTone();
return;
}
else
playWarningTone(); // nope, wrong password
Serial.println("Wrong Password");
}
void changePassword()
{
Serial.println("PASSWORD CHANGE MODE");
Serial.println("ENTER NEW PASSWPORD");
if(locked == 0) // only get into this mode if unlocked! (otherwise anyone can change password without knowing correct one! that would be dumb!)
{
digitalWrite(redLedpin, HIGH); // turn on RED LED
digitalWrite(greenLedpin, HIGH); // turn on GREEN LED
char pkey = NO_KEY;
int c = 0;
while(c < 4)
{
pkey = panel_keypad.getKey(); // get new password 4 digits
if(pkey != NO_KEY)
{
playKeyTone();
password[c] = pkey; // store it in the password string
Serial.println(pkey);
c = c + 1;
}
}
Serial.println("THANK YOU YOUR NEW PASSWORD IS:");
Serial.println(password);
}
}
int matchString(char* string1, char*string2) // function to match two strings, returns 1 if they match, 0 if they dont
{
for(int i=0; i < 5; i++)
{
if(string1[i] != string2[i])
{
return 0;
}
}
return 1;
}
void clearPassword() // clears the entered password after system is locked (so person can't just press # to unlock, needs to enter 4 digit code again!)
{
for(int a=0; a < 4; a++)
{
inputString[a] = '0';
}
}
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