- Programmable Home Security System using LDR by: admin
January 13, 2012, 03:25
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…
- wire loop alarm by: admin
August 18, 2010, 23:23
This circuit is a simple wire loop alarm that can be used in doorways, hallways, or any other place the tripwire will be broken by intruders. The…
- Water seepage alarm (PDF) by: admin
August 18, 2010, 23:23
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- water level alarm by: admin
August 18, 2010, 23:23
A circuit that offers visual indication of fluid level in a vessel, with a switchable audible alarm. Example uses would be to monitor the level…
- water activated alarm by: admin
August 18, 2010, 23:23
The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the…
- ultrasonic radar alarm by: admin
August 18, 2010, 23:23
General Description
This is a very interesting project with many practical applications in security and alarm systems for homes, shops and…
- touch activated alarm system by: admin
August 18, 2010, 23:23
The Parts List
R1 = 100K D1 = 1N4004, general purpose diode R2 = 4K7 C1 = 47µF/16V R3 = 10M IC1 = 555 Timer P1…
- single zone alarm by: admin
August 18, 2010, 23:23
Description:
A single zone alarm circuit with entry and exit delay and other facilities.
The circuit features automatic exit and entry…
- rf alarm by: admin
August 18, 2010, 23:23
This simple circuit is sure to have the police beating a path to your door - however, it has the added advantage of alerting you to their…
- refrigerator door alarm by: admin
August 18, 2010, 23:23
Beeps if you leave open the door over 20 seconds 3V battery operation, simple circuitr
Parts:
R1____________10K 1/4W Resistor…
- proximity detector for living creatures by: admin
August 18, 2010, 23:23
A crucial failing of proximity detectors is their unreliable and tricky nature. This is where they are used to detect humans, not to speak of…
- Proximity alarm by: admin
August 18, 2010, 23:22
- personal silent alarm system by: admin
August 18, 2010, 23:22
The TTY and the detector-transmitter unit are connected to separate phone jacks on the same line. When the ring sensor detects an incoming…
- perimeter monitor by: admin
August 18, 2010, 23:22
Using a single cable such as speaker wire or doorbell cable, this circuit can be remotely positioned, for example, at the bottom of a garden…
- novel buzzer by: admin
August 18, 2010, 23:22
This novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will…
- motorcycle alarm by: admin
August 18, 2010, 23:22
Any number of normally open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is…
- modular burglar alarm by: admin
August 18, 2010, 23:22
This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and normally-open…
- miniature loop alarm by: admin
August 18, 2010, 23:22
A few months ago, I decided to build a compact, yet effective alarm. My demands were:- simple construction, reliable operation, very small power…
- Micro-power over temperature alarm by: admin
August 18, 2010, 23:22
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- Low power RFID transponder by: admin
August 18, 2010, 23:22
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- home security project by: admin
August 18, 2010, 23:22
SECURITY SYSTEM APPLICATION NOTE #1
The security system application and program offers a simple demonstration of the BASIC Serial Interface. By…
- gate alarm circuit by: admin
August 18, 2010, 23:22
Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply.
IC1a is a fast…
- Frost alarm by: admin
August 18, 2010, 23:22
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- enhanced 5 digit alarm keypad by: admin
August 18, 2010, 23:22
This switch will suit the Modular Burglar Alarm circuit. However, it also has other applications. The Keypad must be the kind with a common…
- enhanced 4 digit alarm keypad by: admin
August 18, 2010, 23:22
The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix…
- emergency light and alarm by: admin
August 18, 2010, 23:22
Parts:
R1____________220K 1/4W Resistor R2____________470R 1/2W Resistor R3____________390R 1/4W Resistor R4______________1K5…
- Electronic lock by: admin
August 18, 2010, 23:22
- Electronic door codelock (PIC16F84) by: admin
August 18, 2010, 23:22
- electronic combination lock by: admin
August 18, 2010, 23:22
This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker.…
- Door knob alarm by: admin
August 18, 2010, 23:22
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- digital combination lock by: admin
August 18, 2010, 23:22
The circuit above above makes use of the CMOS 4017 decade counter IC. Each depression of a switch steps the output through 0 - 9. By coupling…
- Combination Lock (PIC16F84) by: admin
August 18, 2010, 23:22
- active ir motion detector by: admin
August 18, 2010, 23:22
Project Objectives
To explore how different motion detectors operate.
To successfully build and test an ambient-light-ignoring…
- alarm control keypad by: admin
August 18, 2010, 23:22
The IC is a quad 2 input "AND" gate, a CMOS 4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the…
- a A Basic RF Transmitter for PIR Sensors by: admin
August 18, 2010, 23:21
- 5 Zone alarm circuit by: admin
August 18, 2010, 23:21
This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CM IC`s and…
