Circuits & Schematics Security - 3

Subsection: "Security"
  Including:
  Bugs   Lie detector
Search results: 50 Output: 21-30
  1. General Description This is a very interesting project with many practical applications in security and alarm systems for homes, shops and cars. It consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When ...
    29-06-2010
  2. Overview The “Simple Wireless Security System” monitors the open/closed state of two (garage) doors. Sensors detect the state of the doors, and a Zigbee wireless transceiver sends the state information to a PC. The PC runs a GUI ...
    25-06-2010
  3. Ok, so there are heaps of immobilisers out there but with most of them, if someone has your keys, they have you car. What good is a car alarm with 3+ point immobilisation if someone manages to get the keys and of course the alarm remote. This is a ...
    12-05-2010
  4. One LED monitors three levels: 50, 70 85 dB Useful to detect too noisy environments Circuit diagram: Parts: R1 10K 1/4W Resistor R2, R3 22K 1/4W Resistors R4 100K 1/4W Resistor R5, R9, R10 56K 1/4W Resistors R6 5K6 1/4W Resistor R7 560R 1/4W ...
    05-04-2010
  1. Vassilis Serasidis This safety-lock circuit use the new Atmel AVR microcontroller series, the ATtiny26 . This micros (and new ATmega8 , ATmega16 etc) are powerful microcontrollers with new features like internal RC calibrated oscillator for 1,2,4 ...
    31-03-2010
  2. Andy Collinson Description This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CMOS IC's and features a timed entry / exit zone, 4 immediate zones and a panic button. There are ...
    17-03-2010
  3. Part 1 Part 2 I started the development with the card and the camera connected to and Atmel STK300 board and a Mega128 chip. Developing on a larger chip facilitates development, as you have extra pins, flash and RAM to use for debug. Once I gained ...
    12-03-2010
  4. The most peculiar aspect of this design is that the firmware is written in BASIC. I’m a strong advocate of using C for embedded systems, and I use routinely the excellent GCC compiler for AVR development on PC and Linux platforms. But at the ...
    04-03-2010
  5. Part 2 Part 3 Video surveillance systems have rapidly grown from being a specialized equipment for high-risk areas (like banks and airports), to the point of being standard facilities of most places open to the public. Nowadays, no shopping centre, ...
    25-02-2010
  6. Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to ...
    16-12-2009
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