Alarm & security related Projects

• 4 Photo-Detector circuit with delayed release and bipolar output
• 5 Zone Alarm Circuit
• 5 Zone alarm circuit
• 5 Zone Alarm System
• Alarm control keypad
• Automatic Intruder Alarm
• Automatic Intruder Alarm
• Build an iButton electronic lock based around a AT91C2051 microcontroller (includes ASM source code)
• Circuit diagram for basic alarm with delayed trigger
• CMOS single zone intruder alarm
• Cold activated switch (frost alarm)
• Combination Lock (PIC16F84)
• Constructing your own Light Alarm
• Digital combination lock
• Digital combination lock using pair of CD4013 CMOS chips
• Digital Keypad Combination Lock
• Door Alarm circuit diagram
• Door knob alarm (PDF)
• Doorbell for the Deaf
• Easy to build tripwire activated alarm
• Electronic door codelock (PIC16F84)
• Electronic locker digital combination lock circuit diagram
• Emergency Light & Alarm
• Emergency Light & Alarm
• Enhanced 4 Digit Alarm Keypad
• Enhanced 4 Digit Alarm Keypad
• Enhanced 5 Digit Alarm Keypad
• Enhanced 5 Digit Alarm Keypad
• Everything-that-moves alarm works by inducing eddy currents in living beings
• Fire alarm circuit diagram based on LDR (light-dependent resistor)
• Fridge door Alarm
• Frost alarm
• Fuse or line monitor that will check the status of up to six fuses including a PCB layout
• Gate alarm
• Gate alarm circuit
• Home security project
• iButton electronic lock (Dallas DS1990A)
• MC68HC908-based wireless monitoring system is adaptable for use in domestic and industrial settings
• Micro-power over temperature alarm (PDF)
• Miniature loop alarm
• Miniature Loop Alarm
• Modular Burglar Alarm
• Modular Burglar Alarm
• Motorcycle alarm
• Multi-zone burglar alarm
• Novel Buzzer
• Perimeter monitor
• Proximity detector (uses human body capacitance)
• Proximity detector for humans / living creatures using eddy current detection
• Rain alarm / rain detector
• Refrigerator door alarm
• Refrigerator Door Alarm
• RF Alarm
• RF Pad - combination-controlled, fully customizable radio frequency remote control
• Single Zone Alarm
• Single Zone CMOS Alarm
• Smartcard controlled relay circuit based around Nutchip microcontroller
• Sun - Up Alarm
• Touch activated alarm system
• Transistor based single zone intruder alarm
• Travel Touch Alarm
• Ultrasonic radar alarm
• Ultrasonic Radar Alarm Circuit Diagram
• Ultrasonic remote control & alarm system
• Wailing alarm siren
• Water Activated Alarm
• Water Activated Alarm
• Water level alarm
• Water Level Indicator with alarm
• Water seepage alarm (PDF)
• Waterpump Safety Guard for fish pond / fish tank
• Wire loop alarm
• Wire Loop Alarm using 4001UBE Quad NOR Gate
• Wireless alarm FM transmitter module
• Wireless alarm system based around Nutchip microcontroller