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Alarm

Dummy Alarm with Flashing LED

Dummy Alarm with Flashing LED

A LED flashing briefly once every 5 seconds to imitate the indicator of a real alarm is the function of this dummy alarm project with the use of a 7555 timer IC.

Portable Alarm for Personal Use

Portable Alarm for Personal Use

The circuit will be useful as personal alarm and anti-snatching bag unit since the design is very small and portable, which can also be used for windows and doors control.

Alarm Circuit for Refrigerator Doors

Alarm Circuit for Refrigerator Doors

The circuit will provide a beeping sound to alarm the household that the refrigerator door has been opened for more than 20 seconds.

Electronically Controlled Security Door Keyboard

Electronically Controlled Security Door Keyboard

The circuit was constructed to provide a simple electronic lock system based on a single integrated circuit and will require a code of seven digits.

Alarm Circuit for Water Level Display

Alarm Circuit for Water Level Display

The circuit was intended for monitoring and measuring the fluid level or content in a storage tank or reservoir by providing visual display with an audible alarm that can be switched.

Alarm Circuit for Snoring Prevention by 555 Timer

Alarm Circuit for Snoring Prevention

The circuit was designed to produce a circuit that will alarm a sleeping person to prevent snoring by using a vibrator instead of an audio alert so as not to affect the whole household.

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