Alarm system with keypad

Projects General Guidance
1

Hi, i'm new on this forum and my English isn't perfect so be patient please :slight_smile:
I'm doing and alarm system and i want to activate and deactivate the alarm using a keypad code.
I use this keypad:

489×845 90.1 KB

I want to get a four character code from the keypad and compare it with a prearrenged code. If the code is right the program will do something, if wrong i want to print an error message and get another time the code.
I was be able to write only this code at the moment and i don't know how to "build" a code from the keypad.

#include <Keypad.h>
const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = 
{
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {9,8,7,6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5,4,3,2}; //connect to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS);
char key;
void setup()
{
  Serial.begin(9600);
}

void loop()
{
key = keypad.getKey();
if (key)
{
  Serial.println(key);
}

Can you please help me with with advices? I only want to know how to get the verification alarm code. Thank you! :slight_smile:

2

I was be able to write only this code at the moment

This code is not written by you. It's all over the internet.

const byte COLS = 4; //three columns

And all the places, it has this funny comment.

http://forum.arduino.cc/index.php?topic=387823
Have a look at this topic. It's pretty much the same question with the same code.

3

dorvakta:
This code is not written by you. It's all over the internet.

const byte COLS = 4; //three columns

And all the places, it has this funny comment.

If this makes you more satisfied yes, i'm not the author of the code. I was only saying that the only code i have in my sketch is the one i posted here.
Anyway, thank you but the topic which you linked doesn't match with my question.

4

What exactly do you want to do?
What display do you have?
Where is your display section of the sketch?
Please show us a schematic of your proposed circuit.