pic12f675 vibration alarm

Vibration Sensor Alarm

T.K. Hareendran - 03/10/14

The idea behind this compact and economical Vibration Sensor Alarm is very simple. It uses a cheap and [...]

Touchless ON/OFF Human Interface Capacitive Switch

Jim Keith - 03/02/14

This sensitive ON/OFF human interface, non-touch, proximity switch is a fun experiment and may just have some useful [...]
power failure alarm circuit

Power Failure Alarm

T.K. Hareendran - 02/17/14

This minuscule power failure alarm circuit is a power supply monitoring device that will set off a piezo-speaker [...]
Arduino PIR sensor

Arduino Night Security Alarm with PIR Sensor

T.K. Hareendran - 01/31/14

In the microcontroller era today, Arduino is more than just a tool to accomplish hobby tasks. There is [...]
Arduino Siren Alarm

Arduino Siren Sound Alarm

T.K. Hareendran - 01/17/14

Now it is very easy to build your own siren sound alarm, small enough to be carried in [...]
arduino security alarm circuit

Arduino Security Alarm with Reed Switch

T.K. Hareendran - 12/01/13

Here is a simple general-purpose security alarm circuit built on the Arduino platform. It brings up an obtrusive [...]
cordless security alarm

Wireless Cashbox Security Alarm

T.K. Hareendran - 11/12/13

Here is an inexpensive circuit of a wireless cashbox security alarm realized using generally available low-cost components. Why [...]
aqua alarm circuit

Water Alarm Circuit

T.K. Hareendran - 11/04/13

Here is another interesting hobby circuit built around the popular and inexpensive 555 IC. It is nothing but [...]
humidity sensor circuit

Humidity Detector Circuit

P. Marian - 10/26/13

This humidity sensor consists of 2 copper conductors that are located at small distance from each other. The [...]
Door Window Alert

Opened Window or Door Alarm

T.K. Hareendran - 08/30/13

Economical circuit of an electronic alarm, notifies you when your door or window is open, is presented here. [...]
Bedwet wet diapers circuit

Bedwetting/Wet Diaper Alert System

T.K. Hareendran - 08/24/13

Bedwetting is one of the most common childhood problems that can have a significant impact on a child’s [...]
door sensor circuit

Low Cost Door Sensor

T.K. Hareendran - 08/05/13

This compact and affordable door sensor mechanism uses a Hall-effect sensor fixed at the corner of the door [...]
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