Automated Home Security System

Automated Home Security system is PIC16F877 based security system with following core features,

Support automatic phone dialing using DTMF tones
Support inputs from three optical sensors
Control external device(s)
Built-in alarm with external audio output
Allow total customization to the end-users (such as program phone numbers, setup device control sequence, etc) without changing the source code.
Password protected system setup

In this design we use PIC16F877 8bit microcontroller as main system controller, NE556 dual timer as an alarm system and 7805 as power regulator. To miniaturize the final product we use some amount of surface mounted parts with this design. Application program(s) of PIC microcontroller is developed using C programming language and release under the terms and conditions of GNU General Public License.

In this design we use some special electronic components/modules which include LCD display module, 4x4 keyboard matrix, telephone isolation transformer, etc. At the time of circuit design we choose common, locally available parts for this design, which include,

HD44780 compatible LCD module
Custom made 4x4 Key Matrix
General 600Ω telephone isolation transformer
NTE-R22 3V relay

In this design we use PIC16F877 MCU to generate DTMF tones (with help of R-2R ladder circuit), as a LCD driver and as a general I/O controller. In PCB design we use generally available DIP version of PIC16F877. Except PIC16F877 and BC140, all other semiconductors are in surface mounted packages.

When installing the system (which means in a practical environment) it is recommended to use LASER pointer as a light source. During our field tests we get successful results with the 5mW LASER module.

In this project all the PCB patterns are design using EAGLE layout designer and all the source, component libraries and output files are available to download with the supplied package.

To get the complete project details (including schematic, PCB design and firmware source code and binaries) visit our project repository at google drive

Comments

Jhon Walker said…

I am really happy to say it’s an interesting post to read. You explain all details very well. Home security is most important need for every home. I suggest you to choose secure and reliable wireless burglar alarm to protect your home and family from burglaries. It easy to use and install. It fills all of your security needs.

September 20, 2019 at 5:17 PM

CD2003 - yet another simple FM radio receiver

In the last few days, we are looking for some simple FM radio receiver to integrate into one of our ongoing projects. For that, we try several FM radio receiver ICs including TDA7000, CD2003/TA2003/TA8164, CXA1019, and KA22429. Out of all those chips we select CD2003 (or TA2003/TA8164) based receiver for our project because of its simplicity and outstanding performance. Except to CD2003, Sony CXA1019 also perform well but we drop it because of its higher component count. We design our receiver based on Toshiba TA2003 datasheet and later we try TA8164 and CD2003 with the same circuit. Either CD2003 or TA8164 can directly replace TA2003 IC, and as per our observations, TA8164 gives excellent results out of those 3 chips. A prototype version of CD2003 FM radio receiver The PCB design and schematic which we used in our prototype project are available to download at google drive (including pin-outs of crystal filters and inductors ). Except for CD2003 IC, this receiver consist...

Arduino superheterodyne receiver

In this project, we extend the shortwave superheterodyne receiver we developed a few years ago . Like the previous design, this receiver operates on the traditional superheterodyne principle. In this upgrade, we enhanced the local oscillator with Si5351 clock generator module and Arduino control circuit. Compared to the old design, this new receiver uses an improved version of an intermediate frequency amplifier with 3 I.F transformers. In this new design, we divide this receiver into several blocks, which include, mixer with a detector, a local oscillator, and an I.F amplifier. The I.F amplifier builds into one PCB. The filter stage, mixer, and detector stages place in another PCB. Prototype version of 455kHz I.F amplifier. In this prototype build, the Si5351 clock generator drives using an Arduino Uno board. With the given sketch, the user can tune and switch the shortwave meter bands using a rotary encoder. The supplied sketch support clock generation from 5205kHz (tuner f...

Calculator for audio output transformers

Audio output transformers are heavily used in a vacuum tube and some (older) transistor base audio power amplifiers, but these days output transformer are quite hard to find and expensive item. For homebrew projects, the best option is to construct those transformers by ourselves and this script helps to calculate winding parameters for those transformers. This " AF output transformer calculator " script is written using Python and it works with most of the commonly available Python interpreters . The script is available to download at google drive under the terms of GNU General Public License version 3.0 . Homebrewed 25k: 4 output transformer Once supplied the input parameters this script provides a winding ratio, the number of turns required for primary and secondary winding and required copper wire gauges for both primary and secondary windings, etc. We construct several AF output transformers based on results of this script, which including transformers for M...