Arduino alarm system with delay (2)

original material

   In this article I put a keyboard for activate and deactivate a alarms system with Arduino board and PIR sensor.

   My schematic is:

and sketch is alarm_system_2a.ino !

   My alarm work in next steps:

- after power on, alarm is OFF, blue led is on

- after you introduce the code (1234* or better #1234* because # clear buffer for old activity) system go to stand-by state, green led is blinking;

- after 20 seconds, system is in waitting (watching) mode, green led is permanent on;

- if PIR sensor detect movement, system begin to countdown, red led flash;

- if you indroduce code, system will be off (blue led in on)

- after 10 seconds (if you not enter the code) buzzer is on (led onboard is on), red led is permanet on

- after 10 seconds, system go to waitting mode, if is movement again, countdown and after buzzer is on, etc;

   You can see 2 movies with states of this alarm system:

- Arduino system alarm with delay (2)

- Arduino system alarm with delay (3)

Arduino alarm system with delay

original material

   At polish site named http://majsterkowo.pl/ I found an article about alarm system using a Arduino board and PIR sensor.
   Base schematic is 

and sketch for alarm is at page 3 in article.

   After I translate name of variables and study original sketch, I made some changes:

Note: I use internal led from Arduino board instead buzzer.
   
   My sketch is alarm_system_1a.ino and I have next states:
- switch is open, blue led is on, alarm is deactivate;

- switch is close (D2 at GND), green led is blinking, alarm is in stand-by

- after 20 seconds, green led in on, alarm is waitting
- if PIR sensor detect a movement, red led is blinking, alarm countdown 

- after 10 seconds, if switch is still close, red led is on, buzzer is active

- after 10 seconds, alarm return to waitting, if is movement, alarm countdown and repeat the cycle
- if switch is open, system in off.
   You can see a movie named Arduino system alarm with delay with all states: