A buzzer or beeper is an audio signaling device, which may be mechanical, electromechanical, or piezoelectric. Typical uses of buzzers and beepers include alarm devices, timers and confirmation of user input such as a mouse click or keystroke.

1. 1
TECHVILL
A
www.techvilla.org.in

2. DISPLAYING STRING,NUMBER ON LCD.
LCD BASED COUNT DOWN TIME WITH ALARMING SYSTEM.
BASIC DIGITAL CLOCK ON LCD WITH ALARMING SYSTEM
www.techvilla.org.in

3.  Buzzer :- An audio signaling device.
 Uses:- Alarm devices,timers,home appliances.
www.techvilla.org.in

4. www.techvilla.org.in