infrared beam break detector circuit

Infrared Beam Break Detector

P. Marian - 07/25/13

Application An infrared detector that sounds a buzzer when an IR beam is broken, meaning the IR signal [...]
PIC12F635 Based Door Alarm System Schematic

PIC12F635 Based Door Alarm System

T.K. Hareendran - 04/30/13

Now you can build your own simple door alarm security system using a tiny microcontroller chip PIC12F635! The [...]
PIC12F675 Security Alarm Circuit Schematic

PIC12F675 Microcontroller Based Security Alarm Circuit

T.K. Hareendran - 04/08/13

Crime in general is still on the rise, and having a security alarm installed is no longer a [...]

Arduino Panic Alarm

T.K. Hareendran - 03/26/13

Here is the circuit of an Arduino-based Panic Alarm! The wiring is very simple so that even a [...]
PIR LED security light circuit schematic

LED Security Light with PIR Motion Sensor

T.K. Hareendran - 02/25/13

Here is one simple circuit of a general-purpose white LED security light with Passive Infrared (PIR) Motion sensing [...]
Non-Contact Human Interface Capacitive Proximity Switch

Non-Contact Human Interface Capacitive Switch

Jim Keith - 02/20/13

Simple, highly sensitive capacitive ON/OFF switch pads change the state of a latch and turn on an LED [...]
smart shadow sensor alarm schematic

Shadow Sensor Alarm

T.K. Hareendran - 02/20/13

Shadow sensors are widely used to detect the movement of a person in a confined area. Many circuits [...]
Smart Smoke Alarm Circuit Update 1

Smoke Alarm Circuit

Jim Keith - 01/17/13

The original smoke alarm circuit has some problems and has left some hobbyists and students disappointed. Rather [...]
photoelectric smoke detector circuit schematic

Photoelectric Smoke Detector

P. Marian - 01/15/13

This photoelectric smoke detector circuit uses one LED and 2 LDRs to detect the smoke and sound an [...]
Anti-Theft Schematic

Bicycle Anti-Theft Alarm Circuit

Jim Keith - 12/26/12

I hate to suggest the specific application 'bicycle' because it may be use to protect many items from [...]
555 Door Ajar Flasher Circuit Schematic

555 Door Ajar Flasher

Jim Keith - 12/11/12

A magnet is placed on the door and a magnetic reed switch on the door casing so when [...]

Security Light & Switch with PIR Sensor Update

Jim Keith - 09/04/12

This is a simple update to Mr. Hareendran’s PIR Sensor Security Light circuit. It has a shortcoming limits [...]
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