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Alarms Circuits (84)

Browse through a total of 84 alarm projects, circuits and kits.

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

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 [...]
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 [...]
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