Circuits & Schematics Security - 3

Subsection: "Security"
  Including:
  Bugs   Lie detector
Search results: 54 Output: 21-30
  1. Introduction In this project we design low cost high performance programmable home security system using few LDR's as an input sensors. When above sensor(s) get triggered system may dial the user specified phone number (using build-in DTMF ...
    04-01-2011
  2. How about getting that old Nokia phone out of your drawer and turning it into something freakishly cool? I will not lie to you, you will need a few tools and skills such as soldering/desoldering and making PCBs. Here you can download Sprint-Layout ...
    23-11-2010
  1. The Button Code is a system that allows a single button to act as a keypad. The user enters a 4 digit code into the system using button taps. The button can be placed where the public can access it since like a keypad there are many combinations to ...
    17-11-2010
  2. D. Mohankumar This motion detector alarm circuit can detect a moving person from a distance of 1 meter. It uses a Dual IR Transmitter-Receiver module HOA1405 . When the sensor detects the reflected IR rays, Alarm will sound for 2 minutes. The ...
    21-09-2010
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
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