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

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

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

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

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

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.