Skip to main content

LASER Based Gate Keeper

These days many verities of alarm systems are available in the market. Some of them get triggered through touch and some type where a wire needs to broken to get triggered.  Both of these types of alarms have some limitations and problems. Wire based alarms are easily avoidable, noticeable and need some regular maintenance. Touch type alarms often pickup RF waves and get activated (because of that it need some controlled environment to function properly).

In this project we design and develop LASER based burglar alarm system. Instead of wire(s) this system use LASER light wave and it can effective for more than 50m. Core features of this alarm system are:

  • High audio output power (Max. 3W PMPO)
  • Master light override switch
  • Inbuilt alarm test functionality
  • Memorized power state
  • Quick response time (aprox. 10ms ~ 30ms)
  • Support for wide input voltage range (15V – 25V DC)
  • Easy to build and calibrate
  • Compact size (aprox. 130 × 200 × 60mm)
This alarm system is specifically design for outdoor use and it is recommended for garages, warehouses, to cover wide range of landscapes, etc.

LASER Based Gate Keeper - final assembly

The core part of this system is ATMega8 MCU and it handles all the functionality of this system. TDA7267A is a power amplifier and NE555 is used as a secondary audio oscillator. TLC393 is used as a sensor driver and it handle both "master LDR" and "environmental sensor LDR". 

This system use high voltage and handle it with extreme care. Do not touch U1’s (BTA12-600) heatsink or associated parts when the power is ON. Make sure to use proper heatsinks for U1 (BTA12-600), IC1 (L7805) and IC2 (L7812) and for IC6 (TDA7267A). The circuit board should be placed in a suitable container and it does not need any maintenance.

This system is distributed as an open hardware project. All the project schematics, firmware files (including source codes) are available to download at google drive. This project is covered under the terms of Creative Commons Attribution 3.0 Unported License and firmware source code is release under the terms of GNU GPL 3.0 License. 

Labels:

Comments

Post a Comment

Popular posts from this blog

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...
2 comments
Read more

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...
Post a Comment
Read more

Experimental narrowband FM receiver for 2-meter band

This project is about MC3362 and ADF4351 based modularized, 2-meter narrow band FM receiver. In this design, the receiver splits into three modules as RF preamplifier, MC3362 tuner, and ADF4351 oscillator. The RF preamplifier builts around BF900 dual-gate MOSFET. The tuner stage builts using the popular MC3362 , low power narrowband FM receiver IC. For the oscillator, we use the ADF4351 DDS RF signal generator module. The core component of this receiver is MC3362 IC. This IC was designed by Motorola and is no longer in production, but this IC is still available to purchase in many online stores . The chip we used in this receiver was purchased from a local electronic component store for LKR 75 (USD 0.2). The RF preamplifier used in this receiver extracts from the N.Ganesan's (VU3GEK) LRR200, 2-meter band FM receiver project . Prototype version of the RF preamplifier. In this prototype, the above preamplifier was built as a module using a Manhattan construction technique. Th...
Post a Comment
Read more