Alarms Circuits (86)

Browse through a total of 86 alarm projects, circuits and kits.

PIR sensors   fire alarms   infrared alarms   motion sensors   sirens   smoke alarms   temperature sensors   touch alarms  

How to Get Started with a Microwave Radar Motion Sensor

T.K. Hareendran - 08/16/17

Last year, I took a look at some mostly low-cost passive infrared (PIR) motion sensor modules. Then recently, [...]
blackcout alert circuit

Intelligent Blackout Notifier

T.K. Hareendran - 08/27/16

The intelligent blackout notifier is a mains supply monitoring device that will trigger a distinct alarm when the [...]
555 flood alarm

Basement Flood Alarm Circuit

T.K. Hareendran - 06/11/16

Even though floods don't always rate high on our list of concerns, if we get an early warning [...]
Night Security Light with PIR sensor circuit

Night Security Light with Hacked PIR sensor

T.K. Hareendran - 11/09/15

Security lighting is widely used as a preventive measure against intrusions on a physical piece of property. Since [...]
laser system

Little Laser Trip Wire Circuit

T.K. Hareendran - 10/24/15

Little Laser Trip Wire circuit presented here can detect movement of people or objects while passing through the [...]
rg-11 rain dome

Optical Rain Sensor RG-11 Review

T.K. Hareendran - 10/02/15

Dreaming about a little device capable of measuring rainfall or closing a skylight when it starts raining? Recently [...]
arduino rfid security system board

Arduino RFID Reader RC522 + Access Control System

P. Marian - 02/18/15

I just received my RC522 RFID reader and made this simple Arduino access control system that uses the [...]
hl-06 doorbell hack

Musical Doorbell as a Shadow Sensor Alarm

T.K. Hareendran - 11/02/14

Our market is flooded with cheap and cheerful AC/DC Multi-Tune Musical doorbells. Most of these doorbells are built [...]
cooling fan monitor circuit

3-Wire Cooling Fan Monitor

T.K. Hareendran - 09/16/14

Cooling fan is an essential part in almost all power electronics systems. Here is a simple circuit for [...]
gsm security alarm prototype

GSM Home Security Alarm System with Arduino

T.K. Hareendran - 08/27/14

[caption id="attachment_10764" align="alignnone" width="550"] Real Time Home Security System using GSM Technology-An Anti-theft System![/caption] This project deals with [...]
door opening alarm circuit

Door Opening Alarm with Sound Alert

Riju Thazhathuveettil - 08/14/14

The door opening alarm circuit or “Front Office Visitor Alert” is used for alerting you when a customer [...]
schematic door buzzer display

Two-Door Buzzer with Display

M.P. Valle - 07/04/14

The Two-door Buzzer with Display is applicable and well suited to be used in a house having two [...]
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