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    74 x Alarms Circuits

    Browse through a total of 74 alarm projects, circuits and kits.

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

    Vibration Sensor Alarm The idea behind this compact and economical Vibration Sensor Alarm is very simple. It uses a cheap and cheerful vibration sensor to drive a piezo-sounder. As can be seen in the circuit diagram, it is wired around one tiny microcontroller PIC12F675. Batteries are suitable for the power supply, because the circuit only takes...
    Touchless ON/OFF Human Interface Capacitive Switch This sensitive ON/OFF human interface, non-touch, proximity switch is a fun experiment and may just have some useful applications. A 74HC02 NOR gate acts as a high impedance capacitive sensor. It sets /resets a latch circuit and drives an LED & relay for high power control. Simply placing a finger near a ‘touch pad’ is...
    Power Failure Alarm This minuscule power failure alarm circuit is a power supply monitoring device that will set off a piezo-speaker when the ac mains mains supply cuts off. It is very helpful to indicate the loss of power supply to some power-critical instruments such as a lifecare device installed in a hospital. Alarm activation at the right...
    Arduino Night Security Alarm with PIR Sensor In the microcontroller era today, Arduino is more than just a tool to accomplish hobby tasks. There is actually a close relationship between microcontroller technology and home security, since you can use a microcontroller based circuit to help you protect your home. Here is an ultra simple Arduino Night Alarm project wired...
    Arduino Siren Sound Alarm Now it is very easy to build your own siren sound alarm, small enough to be carried in a garment pocket. This powerful audio-visual alert device is realized using the renowned Arduino platform. The 9V battery powered circuit produces a loud, wailing sound as a warning signal. As well, one red-colored LED (shines like a beacon)...
    Arduino Security Alarm with Reed Switch Here is a simple general-purpose security alarm circuit built on the Arduino platform. It brings up an obtrusive alert signal when an intrusion/theft attempt is observed by its front-end sensor. In addition, an LCD screen is wired to enhance the system performance. The whole system can be energized from any suitable 9VDC...
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