Security Alarm Using the SCR

Security Alarm is basically a proposal project for our Industrial Engineering subject. We were tasked to make a prototype project that involves the use of the SCR. The idea that me and my group came up with is the SCR, but with modification. Certainly of course, it is much more better if a circuit can be modified in order to enhance the previous one. What me and my group added on the circuit was an LCD and the use of a micro-controller which is a PIC16F877A.

This is basically the circuit we found on the internet.

And this was the modified circuit we made from the circuit above.

What happened here is that we added a PIC16F877A micro-controller to have an LCD display and a modification on the buzzer. Also, we added two switches on the SCR circuit in order to turn off the alarm if it turns on. Ideally, the alarm switch would be placed on a certain protected unit and the main switch is placed next to the user to turn off the alarm at any case. When the alarm is triggered, a signal would be sent to the PIC as my input. Once the PIC receives a signal from the input, the buzzer would alarm and there would be a displayed text appearing from the LCD display such as "Intruder Alert". The LCD display here is basically the J1. I am using the JHD162A 16 Char x 2 Lines Alphanumeric LCD Display. Once the alarm is switched off by the user, the buzzer stops and the display returns to its original state where in the text displayed is "Security Alarm Standby". This circuit is basically for security basis for houses, private rooms, banks, and etc. This is a very useful circuit in terms of prioritizing and securing a certain area.

Here is our final output of the project:

PROJECT MADE BY:

KIRK BENEDICT P. MACARAEG

KEEN LAUD

JUSTIN IDA CABANLIT

JEROME ALVAREZ

JESUS VICENTE BELONIO